SWR_CH_MAX         35 libavfilter/af_amerge.c #define SWR_CH_MAX 32
SWR_CH_MAX         34 libswresample/swresample-test.c #define SWR_CH_MAX 32
SWR_CH_MAX        130 libswresample/swresample.h #define SWR_CH_MAX 32   ///< Maximum number of channels
SWR_CH_MAX         28 libswresample/swresample_internal.h #define SWR_CH_MAX 32