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1 | @anchor{codec-options} |
2 | @chapter Codec Options | |
3 | @c man begin CODEC OPTIONS | |
4 | ||
5 | libavcodec provides some generic global options, which can be set on | |
6 | all the encoders and decoders. In addition each codec may support | |
7 | so-called private options, which are specific for a given codec. | |
8 | ||
9 | Sometimes, a global option may only affect a specific kind of codec, | |
10 | and may be unsensical or ignored by another, so you need to be aware | |
11 | of the meaning of the specified options. Also some options are | |
12 | meant only for decoding or encoding. | |
13 | ||
14 | Options may be set by specifying -@var{option} @var{value} in the | |
15 | FFmpeg tools, or by setting the value explicitly in the | |
16 | @code{AVCodecContext} options or using the @file{libavutil/opt.h} API | |
17 | for programmatic use. | |
18 | ||
19 | The list of supported options follow: | |
20 | ||
21 | @table @option | |
22 | @item b @var{integer} (@emph{encoding,audio,video}) | |
23 | Set bitrate in bits/s. Default value is 200K. | |
24 | ||
25 | @item ab @var{integer} (@emph{encoding,audio}) | |
26 | Set audio bitrate (in bits/s). Default value is 128K. | |
27 | ||
28 | @item bt @var{integer} (@emph{encoding,video}) | |
29 | Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate | |
30 | tolerance specifies how far ratecontrol is willing to deviate from the | |
31 | target average bitrate value. This is not related to min/max | |
32 | bitrate. Lowering tolerance too much has an adverse effect on quality. | |
33 | ||
34 | @item flags @var{flags} (@emph{decoding/encoding,audio,video,subtitles}) | |
35 | Set generic flags. | |
36 | ||
37 | Possible values: | |
38 | @table @samp | |
39 | @item mv4 | |
40 | Use four motion vector by macroblock (mpeg4). | |
41 | @item qpel | |
42 | Use 1/4 pel motion compensation. | |
43 | @item loop | |
44 | Use loop filter. | |
45 | @item qscale | |
46 | Use fixed qscale. | |
47 | @item gmc | |
48 | Use gmc. | |
49 | @item mv0 | |
50 | Always try a mb with mv=<0,0>. | |
51 | @item input_preserved | |
52 | ||
53 | @item pass1 | |
54 | Use internal 2pass ratecontrol in first pass mode. | |
55 | @item pass2 | |
56 | Use internal 2pass ratecontrol in second pass mode. | |
57 | @item gray | |
58 | Only decode/encode grayscale. | |
59 | @item emu_edge | |
60 | Do not draw edges. | |
61 | @item psnr | |
62 | Set error[?] variables during encoding. | |
63 | @item truncated | |
64 | ||
65 | @item naq | |
66 | Normalize adaptive quantization. | |
67 | @item ildct | |
68 | Use interlaced DCT. | |
69 | @item low_delay | |
70 | Force low delay. | |
71 | @item global_header | |
72 | Place global headers in extradata instead of every keyframe. | |
73 | @item bitexact | |
74 | Use only bitexact stuff (except (I)DCT). | |
75 | @item aic | |
76 | Apply H263 advanced intra coding / mpeg4 ac prediction. | |
77 | @item cbp | |
78 | Deprecated, use mpegvideo private options instead. | |
79 | @item qprd | |
80 | Deprecated, use mpegvideo private options instead. | |
81 | @item ilme | |
82 | Apply interlaced motion estimation. | |
83 | @item cgop | |
84 | Use closed gop. | |
85 | @end table | |
86 | ||
87 | @item me_method @var{integer} (@emph{encoding,video}) | |
88 | Set motion estimation method. | |
89 | ||
90 | Possible values: | |
91 | @table @samp | |
92 | @item zero | |
93 | zero motion estimation (fastest) | |
94 | @item full | |
95 | full motion estimation (slowest) | |
96 | @item epzs | |
97 | EPZS motion estimation (default) | |
98 | @item esa | |
99 | esa motion estimation (alias for full) | |
100 | @item tesa | |
101 | tesa motion estimation | |
102 | @item dia | |
103 | dia motion estimation (alias for epzs) | |
104 | @item log | |
105 | log motion estimation | |
106 | @item phods | |
107 | phods motion estimation | |
108 | @item x1 | |
109 | X1 motion estimation | |
110 | @item hex | |
111 | hex motion estimation | |
112 | @item umh | |
113 | umh motion estimation | |
114 | @item iter | |
115 | iter motion estimation | |
116 | @end table | |
117 | ||
118 | @item extradata_size @var{integer} | |
119 | Set extradata size. | |
120 | ||
121 | @item time_base @var{rational number} | |
122 | Set codec time base. | |
123 | ||
124 | It is the fundamental unit of time (in seconds) in terms of which | |
125 | frame timestamps are represented. For fixed-fps content, timebase | |
126 | should be @code{1 / frame_rate} and timestamp increments should be | |
127 | identically 1. | |
128 | ||
129 | @item g @var{integer} (@emph{encoding,video}) | |
130 | Set the group of picture size. Default value is 12. | |
131 | ||
132 | @item ar @var{integer} (@emph{decoding/encoding,audio}) | |
133 | Set audio sampling rate (in Hz). | |
134 | ||
135 | @item ac @var{integer} (@emph{decoding/encoding,audio}) | |
136 | Set number of audio channels. | |
137 | ||
138 | @item cutoff @var{integer} (@emph{encoding,audio}) | |
139 | Set cutoff bandwidth. | |
140 | ||
141 | @item frame_size @var{integer} (@emph{encoding,audio}) | |
142 | Set audio frame size. | |
143 | ||
144 | Each submitted frame except the last must contain exactly frame_size | |
145 | samples per channel. May be 0 when the codec has | |
146 | CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is not | |
147 | restricted. It is set by some decoders to indicate constant frame | |
148 | size. | |
149 | ||
150 | @item frame_number @var{integer} | |
151 | Set the frame number. | |
152 | ||
153 | @item delay @var{integer} | |
154 | ||
155 | @item qcomp @var{float} (@emph{encoding,video}) | |
156 | Set video quantizer scale compression (VBR). It is used as a constant | |
157 | in the ratecontrol equation. Recommended range for default rc_eq: | |
158 | 0.0-1.0. | |
159 | ||
160 | @item qblur @var{float} (@emph{encoding,video}) | |
161 | Set video quantizer scale blur (VBR). | |
162 | ||
163 | @item qmin @var{integer} (@emph{encoding,video}) | |
164 | Set min video quantizer scale (VBR). Must be included between -1 and | |
165 | 69, default value is 2. | |
166 | ||
167 | @item qmax @var{integer} (@emph{encoding,video}) | |
168 | Set max video quantizer scale (VBR). Must be included between -1 and | |
169 | 1024, default value is 31. | |
170 | ||
171 | @item qdiff @var{integer} (@emph{encoding,video}) | |
172 | Set max difference between the quantizer scale (VBR). | |
173 | ||
174 | @item bf @var{integer} (@emph{encoding,video}) | |
175 | Set max number of B frames between non-B-frames. | |
176 | ||
177 | Must be an integer between -1 and 16. 0 means that B-frames are | |
178 | disabled. If a value of -1 is used, it will choose an automatic value | |
179 | depending on the encoder. | |
180 | ||
181 | Default value is 0. | |
182 | ||
183 | @item b_qfactor @var{float} (@emph{encoding,video}) | |
184 | Set qp factor between P and B frames. | |
185 | ||
186 | @item rc_strategy @var{integer} (@emph{encoding,video}) | |
187 | Set ratecontrol method. | |
188 | ||
189 | @item b_strategy @var{integer} (@emph{encoding,video}) | |
190 | Set strategy to choose between I/P/B-frames. | |
191 | ||
192 | @item ps @var{integer} (@emph{encoding,video}) | |
193 | Set RTP payload size in bytes. | |
194 | ||
195 | @item mv_bits @var{integer} | |
196 | @item header_bits @var{integer} | |
197 | @item i_tex_bits @var{integer} | |
198 | @item p_tex_bits @var{integer} | |
199 | @item i_count @var{integer} | |
200 | @item p_count @var{integer} | |
201 | @item skip_count @var{integer} | |
202 | @item misc_bits @var{integer} | |
203 | @item frame_bits @var{integer} | |
204 | @item codec_tag @var{integer} | |
205 | @item bug @var{flags} (@emph{decoding,video}) | |
206 | Workaround not auto detected encoder bugs. | |
207 | ||
208 | Possible values: | |
209 | @table @samp | |
210 | @item autodetect | |
211 | ||
212 | @item old_msmpeg4 | |
213 | some old lavc generated msmpeg4v3 files (no autodetection) | |
214 | @item xvid_ilace | |
215 | Xvid interlacing bug (autodetected if fourcc==XVIX) | |
216 | @item ump4 | |
217 | (autodetected if fourcc==UMP4) | |
218 | @item no_padding | |
219 | padding bug (autodetected) | |
220 | @item amv | |
221 | ||
222 | @item ac_vlc | |
223 | illegal vlc bug (autodetected per fourcc) | |
224 | @item qpel_chroma | |
225 | ||
226 | @item std_qpel | |
227 | old standard qpel (autodetected per fourcc/version) | |
228 | @item qpel_chroma2 | |
229 | ||
230 | @item direct_blocksize | |
231 | direct-qpel-blocksize bug (autodetected per fourcc/version) | |
232 | @item edge | |
233 | edge padding bug (autodetected per fourcc/version) | |
234 | @item hpel_chroma | |
235 | ||
236 | @item dc_clip | |
237 | ||
238 | @item ms | |
239 | Workaround various bugs in microsoft broken decoders. | |
240 | @item trunc | |
241 | trancated frames | |
242 | @end table | |
243 | ||
244 | @item lelim @var{integer} (@emph{encoding,video}) | |
245 | Set single coefficient elimination threshold for luminance (negative | |
246 | values also consider DC coefficient). | |
247 | ||
248 | @item celim @var{integer} (@emph{encoding,video}) | |
249 | Set single coefficient elimination threshold for chrominance (negative | |
250 | values also consider dc coefficient) | |
251 | ||
252 | @item strict @var{integer} (@emph{decoding/encoding,audio,video}) | |
253 | Specify how strictly to follow the standards. | |
254 | ||
255 | Possible values: | |
256 | @table @samp | |
257 | @item very | |
258 | strictly conform to a older more strict version of the spec or reference software | |
259 | @item strict | |
260 | strictly conform to all the things in the spec no matter what consequences | |
261 | @item normal | |
262 | ||
263 | @item unofficial | |
264 | allow unofficial extensions | |
265 | @item experimental | |
266 | allow non standardized experimental things, experimental | |
267 | (unfinished/work in progress/not well tested) decoders and encoders. | |
268 | Note: experimental decoders can pose a security risk, do not use this for | |
269 | decoding untrusted input. | |
270 | @end table | |
271 | ||
272 | @item b_qoffset @var{float} (@emph{encoding,video}) | |
273 | Set QP offset between P and B frames. | |
274 | ||
275 | @item err_detect @var{flags} (@emph{decoding,audio,video}) | |
276 | Set error detection flags. | |
277 | ||
278 | Possible values: | |
279 | @table @samp | |
280 | @item crccheck | |
281 | verify embedded CRCs | |
282 | @item bitstream | |
283 | detect bitstream specification deviations | |
284 | @item buffer | |
285 | detect improper bitstream length | |
286 | @item explode | |
287 | abort decoding on minor error detection | |
288 | @item ignore_err | |
289 | ignore decoding errors, and continue decoding. | |
290 | This is useful if you want to analyze the content of a video and thus want | |
291 | everything to be decoded no matter what. This option will not result in a video | |
292 | that is pleasing to watch in case of errors. | |
293 | @item careful | |
294 | consider things that violate the spec and have not been seen in the wild as errors | |
295 | @item compliant | |
296 | consider all spec non compliancies as errors | |
297 | @item aggressive | |
298 | consider things that a sane encoder should not do as an error | |
299 | @end table | |
300 | ||
301 | @item has_b_frames @var{integer} | |
302 | ||
303 | @item block_align @var{integer} | |
304 | ||
305 | @item mpeg_quant @var{integer} (@emph{encoding,video}) | |
306 | Use MPEG quantizers instead of H.263. | |
307 | ||
308 | @item qsquish @var{float} (@emph{encoding,video}) | |
309 | How to keep quantizer between qmin and qmax (0 = clip, 1 = use | |
310 | differentiable function). | |
311 | ||
312 | @item rc_qmod_amp @var{float} (@emph{encoding,video}) | |
313 | Set experimental quantizer modulation. | |
314 | ||
315 | @item rc_qmod_freq @var{integer} (@emph{encoding,video}) | |
316 | Set experimental quantizer modulation. | |
317 | ||
318 | @item rc_override_count @var{integer} | |
319 | ||
320 | @item rc_eq @var{string} (@emph{encoding,video}) | |
321 | Set rate control equation. When computing the expression, besides the | |
322 | standard functions defined in the section 'Expression Evaluation', the | |
323 | following functions are available: bits2qp(bits), qp2bits(qp). Also | |
324 | the following constants are available: iTex pTex tex mv fCode iCount | |
325 | mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex | |
326 | avgTex. | |
327 | ||
328 | @item maxrate @var{integer} (@emph{encoding,audio,video}) | |
329 | Set max bitrate tolerance (in bits/s). Requires bufsize to be set. | |
330 | ||
331 | @item minrate @var{integer} (@emph{encoding,audio,video}) | |
332 | Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR | |
333 | encode. It is of little use elsewise. | |
334 | ||
335 | @item bufsize @var{integer} (@emph{encoding,audio,video}) | |
336 | Set ratecontrol buffer size (in bits). | |
337 | ||
338 | @item rc_buf_aggressivity @var{float} (@emph{encoding,video}) | |
339 | Currently useless. | |
340 | ||
341 | @item i_qfactor @var{float} (@emph{encoding,video}) | |
342 | Set QP factor between P and I frames. | |
343 | ||
344 | @item i_qoffset @var{float} (@emph{encoding,video}) | |
345 | Set QP offset between P and I frames. | |
346 | ||
347 | @item rc_init_cplx @var{float} (@emph{encoding,video}) | |
348 | Set initial complexity for 1-pass encoding. | |
349 | ||
350 | @item dct @var{integer} (@emph{encoding,video}) | |
351 | Set DCT algorithm. | |
352 | ||
353 | Possible values: | |
354 | @table @samp | |
355 | @item auto | |
356 | autoselect a good one (default) | |
357 | @item fastint | |
358 | fast integer | |
359 | @item int | |
360 | accurate integer | |
361 | @item mmx | |
362 | ||
363 | @item altivec | |
364 | ||
365 | @item faan | |
366 | floating point AAN DCT | |
367 | @end table | |
368 | ||
369 | @item lumi_mask @var{float} (@emph{encoding,video}) | |
370 | Compress bright areas stronger than medium ones. | |
371 | ||
372 | @item tcplx_mask @var{float} (@emph{encoding,video}) | |
373 | Set temporal complexity masking. | |
374 | ||
375 | @item scplx_mask @var{float} (@emph{encoding,video}) | |
376 | Set spatial complexity masking. | |
377 | ||
378 | @item p_mask @var{float} (@emph{encoding,video}) | |
379 | Set inter masking. | |
380 | ||
381 | @item dark_mask @var{float} (@emph{encoding,video}) | |
382 | Compress dark areas stronger than medium ones. | |
383 | ||
384 | @item idct @var{integer} (@emph{decoding/encoding,video}) | |
385 | Select IDCT implementation. | |
386 | ||
387 | Possible values: | |
388 | @table @samp | |
389 | @item auto | |
390 | ||
391 | @item int | |
392 | ||
393 | @item simple | |
394 | ||
395 | @item simplemmx | |
396 | ||
397 | @item simpleauto | |
398 | Automatically pick a IDCT compatible with the simple one | |
399 | ||
400 | @item arm | |
401 | ||
402 | @item altivec | |
403 | ||
404 | @item sh4 | |
405 | ||
406 | @item simplearm | |
407 | ||
408 | @item simplearmv5te | |
409 | ||
410 | @item simplearmv6 | |
411 | ||
412 | @item simpleneon | |
413 | ||
414 | @item simplealpha | |
415 | ||
416 | @item ipp | |
417 | ||
418 | @item xvidmmx | |
419 | ||
420 | @item faani | |
421 | floating point AAN IDCT | |
422 | @end table | |
423 | ||
424 | @item slice_count @var{integer} | |
425 | ||
426 | @item ec @var{flags} (@emph{decoding,video}) | |
427 | Set error concealment strategy. | |
428 | ||
429 | Possible values: | |
430 | @table @samp | |
431 | @item guess_mvs | |
432 | iterative motion vector (MV) search (slow) | |
433 | @item deblock | |
434 | use strong deblock filter for damaged MBs | |
435 | @item favor_inter | |
436 | favor predicting from the previous frame instead of the current | |
437 | @end table | |
438 | ||
439 | @item bits_per_coded_sample @var{integer} | |
440 | ||
441 | @item pred @var{integer} (@emph{encoding,video}) | |
442 | Set prediction method. | |
443 | ||
444 | Possible values: | |
445 | @table @samp | |
446 | @item left | |
447 | ||
448 | @item plane | |
449 | ||
450 | @item median | |
451 | ||
452 | @end table | |
453 | ||
454 | @item aspect @var{rational number} (@emph{encoding,video}) | |
455 | Set sample aspect ratio. | |
456 | ||
457 | @item debug @var{flags} (@emph{decoding/encoding,audio,video,subtitles}) | |
458 | Print specific debug info. | |
459 | ||
460 | Possible values: | |
461 | @table @samp | |
462 | @item pict | |
463 | picture info | |
464 | @item rc | |
465 | rate control | |
466 | @item bitstream | |
467 | ||
468 | @item mb_type | |
469 | macroblock (MB) type | |
470 | @item qp | |
471 | per-block quantization parameter (QP) | |
472 | @item mv | |
473 | motion vector | |
474 | @item dct_coeff | |
475 | ||
476 | @item skip | |
477 | ||
478 | @item startcode | |
479 | ||
480 | @item pts | |
481 | ||
482 | @item er | |
483 | error recognition | |
484 | @item mmco | |
485 | memory management control operations (H.264) | |
486 | @item bugs | |
487 | ||
488 | @item vis_qp | |
489 | visualize quantization parameter (QP), lower QP are tinted greener | |
490 | @item vis_mb_type | |
491 | visualize block types | |
492 | @item buffers | |
493 | picture buffer allocations | |
494 | @item thread_ops | |
495 | threading operations | |
496 | @end table | |
497 | ||
498 | @item vismv @var{integer} (@emph{decoding,video}) | |
499 | Visualize motion vectors (MVs). | |
500 | ||
501 | This option is deprecated, see the codecview filter instead. | |
502 | ||
503 | Possible values: | |
504 | @table @samp | |
505 | @item pf | |
506 | forward predicted MVs of P-frames | |
507 | @item bf | |
508 | forward predicted MVs of B-frames | |
509 | @item bb | |
510 | backward predicted MVs of B-frames | |
511 | @end table | |
512 | ||
513 | @item cmp @var{integer} (@emph{encoding,video}) | |
514 | Set full pel me compare function. | |
515 | ||
516 | Possible values: | |
517 | @table @samp | |
518 | @item sad | |
519 | sum of absolute differences, fast (default) | |
520 | @item sse | |
521 | sum of squared errors | |
522 | @item satd | |
523 | sum of absolute Hadamard transformed differences | |
524 | @item dct | |
525 | sum of absolute DCT transformed differences | |
526 | @item psnr | |
527 | sum of squared quantization errors (avoid, low quality) | |
528 | @item bit | |
529 | number of bits needed for the block | |
530 | @item rd | |
531 | rate distortion optimal, slow | |
532 | @item zero | |
533 | 0 | |
534 | @item vsad | |
535 | sum of absolute vertical differences | |
536 | @item vsse | |
537 | sum of squared vertical differences | |
538 | @item nsse | |
539 | noise preserving sum of squared differences | |
540 | @item w53 | |
541 | 5/3 wavelet, only used in snow | |
542 | @item w97 | |
543 | 9/7 wavelet, only used in snow | |
544 | @item dctmax | |
545 | ||
546 | @item chroma | |
547 | ||
548 | @end table | |
549 | ||
550 | @item subcmp @var{integer} (@emph{encoding,video}) | |
551 | Set sub pel me compare function. | |
552 | ||
553 | Possible values: | |
554 | @table @samp | |
555 | @item sad | |
556 | sum of absolute differences, fast (default) | |
557 | @item sse | |
558 | sum of squared errors | |
559 | @item satd | |
560 | sum of absolute Hadamard transformed differences | |
561 | @item dct | |
562 | sum of absolute DCT transformed differences | |
563 | @item psnr | |
564 | sum of squared quantization errors (avoid, low quality) | |
565 | @item bit | |
566 | number of bits needed for the block | |
567 | @item rd | |
568 | rate distortion optimal, slow | |
569 | @item zero | |
570 | 0 | |
571 | @item vsad | |
572 | sum of absolute vertical differences | |
573 | @item vsse | |
574 | sum of squared vertical differences | |
575 | @item nsse | |
576 | noise preserving sum of squared differences | |
577 | @item w53 | |
578 | 5/3 wavelet, only used in snow | |
579 | @item w97 | |
580 | 9/7 wavelet, only used in snow | |
581 | @item dctmax | |
582 | ||
583 | @item chroma | |
584 | ||
585 | @end table | |
586 | ||
587 | @item mbcmp @var{integer} (@emph{encoding,video}) | |
588 | Set macroblock compare function. | |
589 | ||
590 | Possible values: | |
591 | @table @samp | |
592 | @item sad | |
593 | sum of absolute differences, fast (default) | |
594 | @item sse | |
595 | sum of squared errors | |
596 | @item satd | |
597 | sum of absolute Hadamard transformed differences | |
598 | @item dct | |
599 | sum of absolute DCT transformed differences | |
600 | @item psnr | |
601 | sum of squared quantization errors (avoid, low quality) | |
602 | @item bit | |
603 | number of bits needed for the block | |
604 | @item rd | |
605 | rate distortion optimal, slow | |
606 | @item zero | |
607 | 0 | |
608 | @item vsad | |
609 | sum of absolute vertical differences | |
610 | @item vsse | |
611 | sum of squared vertical differences | |
612 | @item nsse | |
613 | noise preserving sum of squared differences | |
614 | @item w53 | |
615 | 5/3 wavelet, only used in snow | |
616 | @item w97 | |
617 | 9/7 wavelet, only used in snow | |
618 | @item dctmax | |
619 | ||
620 | @item chroma | |
621 | ||
622 | @end table | |
623 | ||
624 | @item ildctcmp @var{integer} (@emph{encoding,video}) | |
625 | Set interlaced dct compare function. | |
626 | ||
627 | Possible values: | |
628 | @table @samp | |
629 | @item sad | |
630 | sum of absolute differences, fast (default) | |
631 | @item sse | |
632 | sum of squared errors | |
633 | @item satd | |
634 | sum of absolute Hadamard transformed differences | |
635 | @item dct | |
636 | sum of absolute DCT transformed differences | |
637 | @item psnr | |
638 | sum of squared quantization errors (avoid, low quality) | |
639 | @item bit | |
640 | number of bits needed for the block | |
641 | @item rd | |
642 | rate distortion optimal, slow | |
643 | @item zero | |
644 | 0 | |
645 | @item vsad | |
646 | sum of absolute vertical differences | |
647 | @item vsse | |
648 | sum of squared vertical differences | |
649 | @item nsse | |
650 | noise preserving sum of squared differences | |
651 | @item w53 | |
652 | 5/3 wavelet, only used in snow | |
653 | @item w97 | |
654 | 9/7 wavelet, only used in snow | |
655 | @item dctmax | |
656 | ||
657 | @item chroma | |
658 | ||
659 | @end table | |
660 | ||
661 | @item dia_size @var{integer} (@emph{encoding,video}) | |
662 | Set diamond type & size for motion estimation. | |
663 | ||
664 | @item last_pred @var{integer} (@emph{encoding,video}) | |
665 | Set amount of motion predictors from the previous frame. | |
666 | ||
667 | @item preme @var{integer} (@emph{encoding,video}) | |
668 | Set pre motion estimation. | |
669 | ||
670 | @item precmp @var{integer} (@emph{encoding,video}) | |
671 | Set pre motion estimation compare function. | |
672 | ||
673 | Possible values: | |
674 | @table @samp | |
675 | @item sad | |
676 | sum of absolute differences, fast (default) | |
677 | @item sse | |
678 | sum of squared errors | |
679 | @item satd | |
680 | sum of absolute Hadamard transformed differences | |
681 | @item dct | |
682 | sum of absolute DCT transformed differences | |
683 | @item psnr | |
684 | sum of squared quantization errors (avoid, low quality) | |
685 | @item bit | |
686 | number of bits needed for the block | |
687 | @item rd | |
688 | rate distortion optimal, slow | |
689 | @item zero | |
690 | 0 | |
691 | @item vsad | |
692 | sum of absolute vertical differences | |
693 | @item vsse | |
694 | sum of squared vertical differences | |
695 | @item nsse | |
696 | noise preserving sum of squared differences | |
697 | @item w53 | |
698 | 5/3 wavelet, only used in snow | |
699 | @item w97 | |
700 | 9/7 wavelet, only used in snow | |
701 | @item dctmax | |
702 | ||
703 | @item chroma | |
704 | ||
705 | @end table | |
706 | ||
707 | @item pre_dia_size @var{integer} (@emph{encoding,video}) | |
708 | Set diamond type & size for motion estimation pre-pass. | |
709 | ||
710 | @item subq @var{integer} (@emph{encoding,video}) | |
711 | Set sub pel motion estimation quality. | |
712 | ||
713 | @item dtg_active_format @var{integer} | |
714 | ||
715 | @item me_range @var{integer} (@emph{encoding,video}) | |
716 | Set limit motion vectors range (1023 for DivX player). | |
717 | ||
718 | @item ibias @var{integer} (@emph{encoding,video}) | |
719 | Set intra quant bias. | |
720 | ||
721 | @item pbias @var{integer} (@emph{encoding,video}) | |
722 | Set inter quant bias. | |
723 | ||
724 | @item color_table_id @var{integer} | |
725 | ||
726 | @item global_quality @var{integer} (@emph{encoding,audio,video}) | |
727 | ||
728 | @item coder @var{integer} (@emph{encoding,video}) | |
729 | ||
730 | Possible values: | |
731 | @table @samp | |
732 | @item vlc | |
733 | variable length coder / huffman coder | |
734 | @item ac | |
735 | arithmetic coder | |
736 | @item raw | |
737 | raw (no encoding) | |
738 | @item rle | |
739 | run-length coder | |
740 | @item deflate | |
741 | deflate-based coder | |
742 | @end table | |
743 | ||
744 | @item context @var{integer} (@emph{encoding,video}) | |
745 | Set context model. | |
746 | ||
747 | @item slice_flags @var{integer} | |
748 | ||
749 | @item xvmc_acceleration @var{integer} | |
750 | ||
751 | @item mbd @var{integer} (@emph{encoding,video}) | |
752 | Set macroblock decision algorithm (high quality mode). | |
753 | ||
754 | Possible values: | |
755 | @table @samp | |
756 | @item simple | |
757 | use mbcmp (default) | |
758 | @item bits | |
759 | use fewest bits | |
760 | @item rd | |
761 | use best rate distortion | |
762 | @end table | |
763 | ||
764 | @item stream_codec_tag @var{integer} | |
765 | ||
766 | @item sc_threshold @var{integer} (@emph{encoding,video}) | |
767 | Set scene change threshold. | |
768 | ||
769 | @item lmin @var{integer} (@emph{encoding,video}) | |
770 | Set min lagrange factor (VBR). | |
771 | ||
772 | @item lmax @var{integer} (@emph{encoding,video}) | |
773 | Set max lagrange factor (VBR). | |
774 | ||
775 | @item nr @var{integer} (@emph{encoding,video}) | |
776 | Set noise reduction. | |
777 | ||
778 | @item rc_init_occupancy @var{integer} (@emph{encoding,video}) | |
779 | Set number of bits which should be loaded into the rc buffer before | |
780 | decoding starts. | |
781 | ||
782 | @item flags2 @var{flags} (@emph{decoding/encoding,audio,video}) | |
783 | ||
784 | Possible values: | |
785 | @table @samp | |
786 | @item fast | |
787 | Allow non spec compliant speedup tricks. | |
788 | @item sgop | |
789 | Deprecated, use mpegvideo private options instead. | |
790 | @item noout | |
791 | Skip bitstream encoding. | |
792 | @item ignorecrop | |
793 | Ignore cropping information from sps. | |
794 | @item local_header | |
795 | Place global headers at every keyframe instead of in extradata. | |
796 | @item chunks | |
797 | Frame data might be split into multiple chunks. | |
798 | @item showall | |
799 | Show all frames before the first keyframe. | |
800 | @item skiprd | |
801 | Deprecated, use mpegvideo private options instead. | |
802 | @item export_mvs | |
803 | Export motion vectors into frame side-data (see @code{AV_FRAME_DATA_MOTION_VECTORS}) | |
804 | for codecs that support it. See also @file{doc/examples/export_mvs.c}. | |
805 | @end table | |
806 | ||
807 | @item error @var{integer} (@emph{encoding,video}) | |
808 | ||
809 | @item qns @var{integer} (@emph{encoding,video}) | |
810 | Deprecated, use mpegvideo private options instead. | |
811 | ||
812 | @item threads @var{integer} (@emph{decoding/encoding,video}) | |
813 | ||
814 | Possible values: | |
815 | @table @samp | |
816 | @item auto | |
817 | detect a good number of threads | |
818 | @end table | |
819 | ||
820 | @item me_threshold @var{integer} (@emph{encoding,video}) | |
821 | Set motion estimation threshold. | |
822 | ||
823 | @item mb_threshold @var{integer} (@emph{encoding,video}) | |
824 | Set macroblock threshold. | |
825 | ||
826 | @item dc @var{integer} (@emph{encoding,video}) | |
827 | Set intra_dc_precision. | |
828 | ||
829 | @item nssew @var{integer} (@emph{encoding,video}) | |
830 | Set nsse weight. | |
831 | ||
832 | @item skip_top @var{integer} (@emph{decoding,video}) | |
833 | Set number of macroblock rows at the top which are skipped. | |
834 | ||
835 | @item skip_bottom @var{integer} (@emph{decoding,video}) | |
836 | Set number of macroblock rows at the bottom which are skipped. | |
837 | ||
838 | @item profile @var{integer} (@emph{encoding,audio,video}) | |
839 | ||
840 | Possible values: | |
841 | @table @samp | |
842 | @item unknown | |
843 | ||
844 | @item aac_main | |
845 | ||
846 | @item aac_low | |
847 | ||
848 | @item aac_ssr | |
849 | ||
850 | @item aac_ltp | |
851 | ||
852 | @item aac_he | |
853 | ||
854 | @item aac_he_v2 | |
855 | ||
856 | @item aac_ld | |
857 | ||
858 | @item aac_eld | |
859 | ||
860 | @item mpeg2_aac_low | |
861 | ||
862 | @item mpeg2_aac_he | |
863 | ||
864 | @item dts | |
865 | ||
866 | @item dts_es | |
867 | ||
868 | @item dts_96_24 | |
869 | ||
870 | @item dts_hd_hra | |
871 | ||
872 | @item dts_hd_ma | |
873 | ||
874 | @end table | |
875 | ||
876 | @item level @var{integer} (@emph{encoding,audio,video}) | |
877 | ||
878 | Possible values: | |
879 | @table @samp | |
880 | @item unknown | |
881 | ||
882 | @end table | |
883 | ||
884 | @item lowres @var{integer} (@emph{decoding,audio,video}) | |
885 | Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions. | |
886 | ||
887 | @item skip_threshold @var{integer} (@emph{encoding,video}) | |
888 | Set frame skip threshold. | |
889 | ||
890 | @item skip_factor @var{integer} (@emph{encoding,video}) | |
891 | Set frame skip factor. | |
892 | ||
893 | @item skip_exp @var{integer} (@emph{encoding,video}) | |
894 | Set frame skip exponent. | |
895 | Negative values behave identical to the corresponding positive ones, except | |
896 | that the score is normalized. | |
897 | Positive values exist primarily for compatibility reasons and are not so useful. | |
898 | ||
899 | @item skipcmp @var{integer} (@emph{encoding,video}) | |
900 | Set frame skip compare function. | |
901 | ||
902 | Possible values: | |
903 | @table @samp | |
904 | @item sad | |
905 | sum of absolute differences, fast (default) | |
906 | @item sse | |
907 | sum of squared errors | |
908 | @item satd | |
909 | sum of absolute Hadamard transformed differences | |
910 | @item dct | |
911 | sum of absolute DCT transformed differences | |
912 | @item psnr | |
913 | sum of squared quantization errors (avoid, low quality) | |
914 | @item bit | |
915 | number of bits needed for the block | |
916 | @item rd | |
917 | rate distortion optimal, slow | |
918 | @item zero | |
919 | 0 | |
920 | @item vsad | |
921 | sum of absolute vertical differences | |
922 | @item vsse | |
923 | sum of squared vertical differences | |
924 | @item nsse | |
925 | noise preserving sum of squared differences | |
926 | @item w53 | |
927 | 5/3 wavelet, only used in snow | |
928 | @item w97 | |
929 | 9/7 wavelet, only used in snow | |
930 | @item dctmax | |
931 | ||
932 | @item chroma | |
933 | ||
934 | @end table | |
935 | ||
936 | @item border_mask @var{float} (@emph{encoding,video}) | |
937 | Increase the quantizer for macroblocks close to borders. | |
938 | ||
939 | @item mblmin @var{integer} (@emph{encoding,video}) | |
940 | Set min macroblock lagrange factor (VBR). | |
941 | ||
942 | @item mblmax @var{integer} (@emph{encoding,video}) | |
943 | Set max macroblock lagrange factor (VBR). | |
944 | ||
945 | @item mepc @var{integer} (@emph{encoding,video}) | |
946 | Set motion estimation bitrate penalty compensation (1.0 = 256). | |
947 | ||
948 | @item skip_loop_filter @var{integer} (@emph{decoding,video}) | |
949 | @item skip_idct @var{integer} (@emph{decoding,video}) | |
950 | @item skip_frame @var{integer} (@emph{decoding,video}) | |
951 | ||
952 | Make decoder discard processing depending on the frame type selected | |
953 | by the option value. | |
954 | ||
955 | @option{skip_loop_filter} skips frame loop filtering, @option{skip_idct} | |
956 | skips frame IDCT/dequantization, @option{skip_frame} skips decoding. | |
957 | ||
958 | Possible values: | |
959 | @table @samp | |
960 | @item none | |
961 | Discard no frame. | |
962 | ||
963 | @item default | |
964 | Discard useless frames like 0-sized frames. | |
965 | ||
966 | @item noref | |
967 | Discard all non-reference frames. | |
968 | ||
969 | @item bidir | |
970 | Discard all bidirectional frames. | |
971 | ||
972 | @item nokey | |
973 | Discard all frames excepts keyframes. | |
974 | ||
975 | @item all | |
976 | Discard all frames. | |
977 | @end table | |
978 | ||
979 | Default value is @samp{default}. | |
980 | ||
981 | @item bidir_refine @var{integer} (@emph{encoding,video}) | |
982 | Refine the two motion vectors used in bidirectional macroblocks. | |
983 | ||
984 | @item brd_scale @var{integer} (@emph{encoding,video}) | |
985 | Downscale frames for dynamic B-frame decision. | |
986 | ||
987 | @item keyint_min @var{integer} (@emph{encoding,video}) | |
988 | Set minimum interval between IDR-frames. | |
989 | ||
990 | @item refs @var{integer} (@emph{encoding,video}) | |
991 | Set reference frames to consider for motion compensation. | |
992 | ||
993 | @item chromaoffset @var{integer} (@emph{encoding,video}) | |
994 | Set chroma qp offset from luma. | |
995 | ||
996 | @item trellis @var{integer} (@emph{encoding,audio,video}) | |
997 | Set rate-distortion optimal quantization. | |
998 | ||
999 | @item sc_factor @var{integer} (@emph{encoding,video}) | |
1000 | Set value multiplied by qscale for each frame and added to | |
1001 | scene_change_score. | |
1002 | ||
1003 | @item mv0_threshold @var{integer} (@emph{encoding,video}) | |
1004 | @item b_sensitivity @var{integer} (@emph{encoding,video}) | |
1005 | Adjust sensitivity of b_frame_strategy 1. | |
1006 | ||
1007 | @item compression_level @var{integer} (@emph{encoding,audio,video}) | |
1008 | @item min_prediction_order @var{integer} (@emph{encoding,audio}) | |
1009 | @item max_prediction_order @var{integer} (@emph{encoding,audio}) | |
1010 | @item timecode_frame_start @var{integer} (@emph{encoding,video}) | |
1011 | Set GOP timecode frame start number, in non drop frame format. | |
1012 | ||
1013 | @item request_channels @var{integer} (@emph{decoding,audio}) | |
1014 | Set desired number of audio channels. | |
1015 | ||
1016 | @item bits_per_raw_sample @var{integer} | |
1017 | @item channel_layout @var{integer} (@emph{decoding/encoding,audio}) | |
1018 | ||
1019 | Possible values: | |
1020 | @table @samp | |
1021 | @end table | |
1022 | @item request_channel_layout @var{integer} (@emph{decoding,audio}) | |
1023 | ||
1024 | Possible values: | |
1025 | @table @samp | |
1026 | @end table | |
1027 | @item rc_max_vbv_use @var{float} (@emph{encoding,video}) | |
1028 | @item rc_min_vbv_use @var{float} (@emph{encoding,video}) | |
1029 | @item ticks_per_frame @var{integer} (@emph{decoding/encoding,audio,video}) | |
1030 | @item color_primaries @var{integer} (@emph{decoding/encoding,video}) | |
1031 | @item color_trc @var{integer} (@emph{decoding/encoding,video}) | |
1032 | @item colorspace @var{integer} (@emph{decoding/encoding,video}) | |
1033 | @item color_range @var{integer} (@emph{decoding/encoding,video}) | |
1034 | @item chroma_sample_location @var{integer} (@emph{decoding/encoding,video}) | |
1035 | ||
1036 | @item log_level_offset @var{integer} | |
1037 | Set the log level offset. | |
1038 | ||
1039 | @item slices @var{integer} (@emph{encoding,video}) | |
1040 | Number of slices, used in parallelized encoding. | |
1041 | ||
1042 | @item thread_type @var{flags} (@emph{decoding/encoding,video}) | |
1043 | Select which multithreading methods to use. | |
1044 | ||
1045 | Use of @samp{frame} will increase decoding delay by one frame per | |
1046 | thread, so clients which cannot provide future frames should not use | |
1047 | it. | |
1048 | ||
1049 | Possible values: | |
1050 | @table @samp | |
1051 | @item slice | |
1052 | Decode more than one part of a single frame at once. | |
1053 | ||
1054 | Multithreading using slices works only when the video was encoded with | |
1055 | slices. | |
1056 | ||
1057 | @item frame | |
1058 | Decode more than one frame at once. | |
1059 | @end table | |
1060 | ||
1061 | Default value is @samp{slice+frame}. | |
1062 | ||
1063 | @item audio_service_type @var{integer} (@emph{encoding,audio}) | |
1064 | Set audio service type. | |
1065 | ||
1066 | Possible values: | |
1067 | @table @samp | |
1068 | @item ma | |
1069 | Main Audio Service | |
1070 | @item ef | |
1071 | Effects | |
1072 | @item vi | |
1073 | Visually Impaired | |
1074 | @item hi | |
1075 | Hearing Impaired | |
1076 | @item di | |
1077 | Dialogue | |
1078 | @item co | |
1079 | Commentary | |
1080 | @item em | |
1081 | Emergency | |
1082 | @item vo | |
1083 | Voice Over | |
1084 | @item ka | |
1085 | Karaoke | |
1086 | @end table | |
1087 | ||
1088 | @item request_sample_fmt @var{sample_fmt} (@emph{decoding,audio}) | |
1089 | Set sample format audio decoders should prefer. Default value is | |
1090 | @code{none}. | |
1091 | ||
1092 | @item pkt_timebase @var{rational number} | |
1093 | ||
1094 | @item sub_charenc @var{encoding} (@emph{decoding,subtitles}) | |
1095 | Set the input subtitles character encoding. | |
1096 | ||
1097 | @item field_order @var{field_order} (@emph{video}) | |
1098 | Set/override the field order of the video. | |
1099 | Possible values: | |
1100 | @table @samp | |
1101 | @item progressive | |
1102 | Progressive video | |
1103 | @item tt | |
1104 | Interlaced video, top field coded and displayed first | |
1105 | @item bb | |
1106 | Interlaced video, bottom field coded and displayed first | |
1107 | @item tb | |
1108 | Interlaced video, top coded first, bottom displayed first | |
1109 | @item bt | |
1110 | Interlaced video, bottom coded first, top displayed first | |
1111 | @end table | |
1112 | ||
1113 | @item skip_alpha @var{integer} (@emph{decoding,video}) | |
1114 | Set to 1 to disable processing alpha (transparency). This works like the | |
1115 | @samp{gray} flag in the @option{flags} option which skips chroma information | |
1116 | instead of alpha. Default is 0. | |
1117 | @end table | |
1118 | ||
1119 | @c man end CODEC OPTIONS | |
1120 | ||
1121 | @ifclear config-writeonly | |
1122 | @include decoders.texi | |
1123 | @end ifclear | |
1124 | @ifclear config-readonly | |
1125 | @include encoders.texi | |
1126 | @end ifclear |