[Libav-user] Questions regarding change in lib behaviour for mpeg2 fourCCs in mov

[Robert Krüger]

Hi,

a recent update of our application showed that setting the codec_tag
for muxing no longer worked for mpeg2. AFAICS the reason is commit
713dcdbfcbaa305050ae6362e5131e0e2e705135.

If I see this correctly, this means if I disagree for whatever reason
with the fourcc that ffmpeg decodes on, my application has no way to
override it. Is this intentional? Couldn't one imagine a case where I
wanted or have to make that decision outside, be it to fulfill some
proprietary requirements?

Is the behaviour regarding muxer and codec_tag defined somewhere?

Thanks for any insights on this.

Robert