[FFmpeg-devel] [PATCH]Reorder channels for some mov channel layouts

Nicolas George nicolas.george at normalesup.org
Thu Jun 23 19:22:43 CEST 2011

Le quintidi 5 messidor, an CCXIX, Carl Eugen Hoyos a écrit :
> Would that be sufficient for stream copy?
> (I don't think so.)

What would be the problem?

The demuxer reads the tag, look-it up in the table, and sets the map in the

The muxer looks at the map in the context, look-it up in the table, and
writes the tag.

Anyway, insisting on stream copy rather than transcoding for PCM is rather
moot, isn't it?

> Sure, but I thought about moving it as soon as/if another codec needs it.

7- and 8-channels FLAC has also undefined channel layout and order, and
would require external information for the mapping. But I suppose FLAC is
not possible in this particular format anyway, is it?

By the way, what is the value of this CAFChannelLayoutTag when the codec
encodes the channels by function rather than by number, like AAC or AC3?


  Nicolas George
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