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

Josh de Kock josh at itanimul.li
Mon Nov 21 11:55:06 EET 2016

On 21/11/2016 09:51, Carl Eugen Hoyos wrote:
> 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?

Pretty much (it's also something I'm already working on).


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