AVFMT_VARIABLE_FPS  864 ffmpeg.c               else if (video_sync_method == 2 || (video_sync_method<0 && (s->oformat->flags & AVFMT_VARIABLE_FPS))){
AVFMT_VARIABLE_FPS  609 libavformat/avienc.c     .flags= AVFMT_VARIABLE_FPS,
AVFMT_VARIABLE_FPS  891 libavformat/matroskaenc.c     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
AVFMT_VARIABLE_FPS 1861 libavformat/movenc.c     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
AVFMT_VARIABLE_FPS 1893 libavformat/movenc.c     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
AVFMT_VARIABLE_FPS  828 libavformat/nutenc.c     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,