AV_CH_BACK_LEFT    94 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_QUAD              (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
AV_CH_BACK_LEFT    97 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_5POINT0_BACK      (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
AV_CH_BACK_LEFT   105 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_7POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
AV_CH_BACK_LEFT   107 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_7POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
AV_CH_BACK_LEFT   110 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_OCTAGONAL         (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT)