SAMPLE_FMT_NONE   118 ffmpeg.c       static enum SampleFormat audio_sample_fmt = SAMPLE_FMT_NONE;
SAMPLE_FMT_NONE  1796 ffmpeg.c                       ost->reformat_pair = MAKE_SFMT_PAIR(SAMPLE_FMT_NONE,SAMPLE_FMT_NONE);
SAMPLE_FMT_NONE    60 libavcodec/audioconvert.c     return SAMPLE_FMT_NONE;
SAMPLE_FMT_NONE   764 libavcodec/utils.c         if (enc->sample_fmt != SAMPLE_FMT_NONE) {
SAMPLE_FMT_NONE  1846 libavformat/utils.c         val = enc->sample_rate && enc->channels && enc->sample_fmt != SAMPLE_FMT_NONE;