On Thu, Aug 07, 2014 at 04:52:43PM +0200, Robert Krüger wrote: > Hi, > > could someone explain, what the difference between those two is and > when to use which one? > > #define AV_CH_LAYOUT_STEREO (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT) > #define AV_CH_LAYOUT_STEREO_DOWNMIX (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)
if you have a file with 2 channels these would likely be AV_CH_LAYOUT_STEREO if you have a file with 5.1 that in addition have 2 channels for stereo playback equipment then that would have 8 channels and use AV_CH_LAYOUT_STEREO_DOWNMIX + whatever else for 5.1 > > E.g. when I extract metadata and want to use that as a basis to > display the channel info to a user in a UI it is a bit surprising to > display "Front left" and "Front right" for the channels of a plain > stereo file. I can handle that case manually but it would be nice to > understand the rationale behind it. > > Regards, > > Robert > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB The bravest are surely those who have the clearest vision of what is before them, glory and danger alike, and yet notwithstanding go out to meet it. -- Thucydides
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