ff_v4l2_format_avcodec_to_v4l2  542 libavcodec/v4l2_context.c     v4l2_fmt = ff_v4l2_format_avcodec_to_v4l2(ctx->av_codec_id);
ff_v4l2_format_avcodec_to_v4l2   31 libavcodec/v4l2_fmt.h uint32_t ff_v4l2_format_avcodec_to_v4l2(enum AVCodecID avcodec);