ctx->params->fpsDenom = avctx->time_base.num * avctx->ticks_per_frame;
ctx->params->sourceWidth = avctx->width;
ctx->params->sourceHeight = avctx->height;
ctx->params->fpsDenom = avctx->time_base.num * avctx->ticks_per_frame;
ctx->params->sourceWidth = avctx->width;
ctx->params->sourceHeight = avctx->height;