[libav-bugs] [Bug 580] av_guess_codec ignores parameters and returns surprising values

bugzilla at libav.org bugzilla at libav.org
Mon Oct 28 21:06:16 CET 2013


--- Comment #4 from Andrew Kelley <superjoe30 at gmail.com> 2013-10-28 21:06:15 CET ---
(In reply to comment #3)
> Well, since that function is not really documented, we can only guess what
> short_name is supposed to mean. IMO it wouldn't make much sense for it to be
> the _codec_ name, since then it'd just duplicate the relevant function from
> libavcodec. So I would assume that the author's intention was that it's the
> _muxer_ name.
> In any case, patches documenting and improving that function are welcome.

I would be happy to do this. If I did, I would basically change av_guess_codec
to this (and then document it):

    AVCodec *codec = NULL;
    if (short_name) {
        codec = avcodec_find_encoder_by_name(short_name);
        if (!codec) {
            const AVCodecDescriptor *desc =
            if (desc) {
                codec = avcodec_find_encoder(desc->id);
    if (!codec) {
        // do the previous logic that was in av_guess_codec

But this seems against the comment you just made. Can you give more guidance as
to the direction you want av_guess_codec to go?

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