AV_CH_LOW_FREQUENCY   87 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_2POINT1           (AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY)
AV_CH_LOW_FREQUENCY   90 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_3POINT1           (AV_CH_LAYOUT_SURROUND|AV_CH_LOW_FREQUENCY)
AV_CH_LOW_FREQUENCY   92 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_4POINT1           (AV_CH_LAYOUT_4POINT0|AV_CH_LOW_FREQUENCY)
AV_CH_LOW_FREQUENCY   96 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_5POINT1           (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)
AV_CH_LOW_FREQUENCY   98 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_5POINT1_BACK      (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)
AV_CH_LOW_FREQUENCY  104 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_6POINT1_FRONT     (AV_CH_LAYOUT_6POINT0_FRONT|AV_CH_LOW_FREQUENCY)