[FFmpeg-user] FFMPeg reading from Logitech C920 generating H264 source produces empty output file

Carl Eugen Hoyos cehoyos at ag.or.at
Sun Sep 1 10:17:34 CEST 2013

William C Bonner <wimbonner <at> gmail.com> writes:

> I looked at https://trac.ffmpeg.org/ticket/2882 as 
> well as looking at the patch submitted.
> I just now manually installed the patch in my local 
> copy of the source and rebuilt ffmpeg. Now things 
> seem to work with or without the -copyinfk flag.

Thank you for testing!

Does it still work (without -copyinkf !) if you use 

Carl Eugen

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 33668c1..c7cd519 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -931,6 +931,9 @@ static int v4l2_read_header(AVFormatContext *s1)
     if (codec_id == AV_CODEC_ID_RAWVIDEO)
         st->codec->codec_tag =
+    else if (codec_id == AV_CODEC_ID_H264) {
+        st->need_parsing = AVSTREAM_PARSE_HEADERS;
+    }
     if (desired_format == V4L2_PIX_FMT_YVU420)
         st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
     else if (desired_format == V4L2_PIX_FMT_YVU410)

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