[FFmpeg-devel] [RFC] lavf: add CoreMedia AVCodecTag mappings

Carl Eugen Hoyos ceffmpeg at gmail.com
Mon Nov 21 11:51:03 EET 2016

2016-11-21 10:35 GMT+01:00 Josh de Kock <josh at itanimul.li>:
> On 20/11/2016 22:49, Carl Eugen Hoyos wrote:
>> 2016-11-19 17:37 GMT+01:00 Josh de Kock <josh at itanimul.li>:
>>> I've mapped a fair amount of the CoreMedia FourCCs to their
>>> respective AVCodecIDs. The ones I didn't know or thought didn't
>>> exist in FFmpeg have been mapped to AV_CODEC_ID_NONE.
>> Could you explain the use-case for these mappings?
> This was discussed in IRC, there was a bit of confusion about how FFmpeg
> supported certain types of data, so the muxed, metadata, and timecode
> mappings are no longer relevant.
> As for usecase, it would make working with CoreMedia and FFmpeg tons easier
> because you can easily identify what the different types of stream are
> coming out of CoreMedia with minimal custom code (i.e. checking the mapping
> first, and then probe it with FFmpeg if one is not found). It also helps
> with getting an AVCodecID from a CMDescriptionRef with the least amount of
> pain.

Could it be that you are saying FFmpeg needs a CoreMedia demuxer?

Carl Eugen

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