[FFmpeg-user] Catching the h264 vidoestream from a Logitech C920 to a file...

[meino.cramer at gmx.de]

Hi,

I am running 

ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  6 2014 18:22:04 with gcc 4.8.2 (Gentoo 4.8.2 p1.3r1, pie-0.5.8r1)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 -pipe -msse3 -ggdb' --extra-cflags='-march=native -O2 -pipe -msse3 -ggdb' --extra-cxxflags='-march=native -O2 -pipe -msse3 -ggdb' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --disable-indev=oss --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-network --disable-openssl --enable-ffplay --enable-vaapi --enable-vdpau --enable-zlib --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-libfdk-aac --disable-libaacplus --disable-libfaac --enable-libtheora --disable-libtwolame --enable-libx264 --disable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100

on a Gentoo Linux system


After searching, I found here a recipe:
http://ffmpeg-users.933282.n4.nabble.com/ffmpeg-cannot-capture-h264-from-webcam-C920-td4660906.html

It say, that this would do the trick.
fmpeg -report -s 1920x1080 f v4l2 -vcodec h264 -i /dev/video0 -copyinkf -vcodec copy test.mp4 

Applying this, ffmpeg says

ffmpeg started on 2014-09-13 at 13:00:38
Report written to "ffmpeg-20140913-130038.log"
ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  6 2014 18:22:04 with gcc 4.8.2 (Gentoo 4.8.2 p1.3r1, pie-0.5.8r1)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 -pipe -msse3 -ggdb' --extra-cflags='-march=native -O2 -pipe -msse3 -ggdb' --extra-cxxflags='-march=native -O2 -pipe -msse3 -ggdb' --disable-static --enable-gpl --enable-postproc --enable-avfilter --enable-avresample --disable-stripping --disable-indev=oss --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-hardcoded-tables --enable-iconv --enable-network --disable-openssl --enable-ffplay --enable-vaapi --enable-vdpau --enable-zlib --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libmp3lame --disable-libfdk-aac --disable-libaacplus --disable-libfaac --enable-libtheora --disable-libtwolame --enable-libx264 --disable-libxvid --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
/dev/video1: Invalid argument


But this works:
gst-launch-1.0 -e v4l2src device=/dev/video1 pixel-aspect-ratio=16:9 force-aspect-ratio=True ! video/x-h264, width=1920, height=1080, framerate=30/1 ! avdec_h264 ! xvimagesink sync=false

(only to proof that /dev/video1 is of as the camera is working)

What am I doing wrong here ?

Thank you very much for any help in advance!
Best regards,
mcc