Formats ARGB32, XRGB32, ABGR32, and XBGR32 were added to V4L2 instead of ill-defined deprecated RGB32/BGR32 pixel formats.
When pixel format is not specified explicitly FFmpeg tries formats in order in which they are stored in the table. Therefore formats are sorted as follows: BGR is preferred over RGB and XBGR is preferred over ARGB, because it could give better performance by ignoring alpha component. --- libavdevice/v4l2-common.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavdevice/v4l2-common.c b/libavdevice/v4l2-common.c index 196c09b7fc..2d6bfac8ca 100644 --- a/libavdevice/v4l2-common.c +++ b/libavdevice/v4l2-common.c @@ -34,6 +34,12 @@ const struct fmt_map ff_fmt_conversion_table[] = { { AV_PIX_FMT_RGB565BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X }, { AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 }, { AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 }, +#ifdef V4L2_PIX_FMT_XBGR32 + { AV_PIX_FMT_BGR0, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_XBGR32 }, + { AV_PIX_FMT_0RGB, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_XRGB32 }, + { AV_PIX_FMT_BGRA, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_ABGR32 }, + { AV_PIX_FMT_ARGB, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_ARGB32 }, +#endif { AV_PIX_FMT_BGR0, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 }, { AV_PIX_FMT_0RGB, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 }, { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY }, -- 2.17.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel