[FFmpeg-devel] [PATCH] avfiltergraph: fix format selection.

Michael Niedermayer michaelni at gmx.at
Tue Apr 24 16:26:31 CEST 2012

On Mon, Apr 23, 2012 at 05:46:07PM +0200, Nicolas George wrote:
> The old code had two bugs:
> For audio filters, the format was not set.
> For video filters, if several links reference the same format list,
> the same format must be selected in the end. This is done by
> setting formats->format_count to 1: the other links sharing
> the reference will therefore have only one choice.
> If the heuristic does not pick the first format, the selected format
> must also be moved to the first position.
> Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
> ---
>  libavfilter/avfiltergraph.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> The bug was introduced by the following commit:
> 0d115d7 avfiltergraph: More advanced heuristic to select colorspace.
> It can be experienced using the following command:
> ./ffmpeg_g -vcodec pgmyuv -i tests/vsynth1/00.pgm \
>   -vf format=yuv444p10,scale,crop,scale,format=yuv444p10 -f null -
> Notice how the scale filters just before and just after crop do not have
> matching colorspace: the first converts to rgb48be and the second from
> yuv420p.

patch LGTM


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