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• USB webcam streaming in ARM board (i.MX6)

  5 septembre 2017, par Titus

  I want to streaming the camera via NETWORK. I have connected the USB webcam to i.MX6 board and want to stream in Ubuntu14.04/16.04 via network.

  Incidentally, I have installed the gstreamer and ffmpeg tools for this in i.MX6 board.

  Also I am able to stream USB webcam within Ubuntu14.04 PC using the following ffmpeg commands. But it’s also not working if I use ffplay in other Ubuntu16.04 and I am not sure why (both are same ffmpeg versions).

  ffmpeg -f v4l2 -i /dev/video0 -preset ultrafast -vcodec libx264 -tune zerolatency -b 900k -f mpegts udp://192.168.0.37:1234
  
  
  
  ffplay udp://192.168.0.37:1234

  Ubuntu 16.06 : (NOT WORKING)

  tus@titus-PC:~/workdir$ ffplay udp://192.168.0.105:1234
  
  ffplay version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0  

  Ubuntu 14.04 : (WORKING)

  titus@titus-laptop:~$ 
  
  titus@titus-laptop:~$ ffplay udp://127.0.0.1:1234
  
  ffplay version 3.3.2 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  [h264 @ 0xb0621660] non-existing PPS 0 referenced sq=    0B f=0/0   
  
      Last message repeated 1 times
  
  [h264 @ 0xb0621660] decode_slice_header error
  
  [h264 @ 0xb0621660] non-existing PPS 0 referenced
  
  [h264 @ 0xb0621660] decode_slice_header error
  
  [h264 @ 0xb0621660] non-existing PPS 0 referenced
  
  [h264 @ 0xb0621660] decode_slice_header error
  
  [h264 @ 0xb0621660] non-existing PPS 0 referenced
  
  [h264 @ 0xb0621660] decode_slice_header error
  
  [h264 @ 0xb0621660] no frame!
  
  [h264 @ 0xb0621660] non-existing PPS 0 referenced sq=    0B f=0/0   
  
  1751.47 M-V: -0.021 fd=   0 aq=    0KB vq=   11KB sq=    0B f=0/0   
  
  1751.63 M-V: -0.020 fd=   0 aq=    0KB vq=   11KB sq=    0B f=0/0   
  
  1751.80 M-V: -0.020 fd=   0 aq=    0KB vq=   11KB sq=    0B f=0/0 

  Finally I want to stream with different ARM boards. Am also not able to build ffplay command. Same issue with raspberry pi too. I am doing something wrong or misunderstood something here ?

• vaapi_h264 : Add trivial support for low-power encoding

  18 mai 2016, par Mark Thompson

  vaapi_h264 : Add trivial support for low-power encoding
  Experimental ; requires Skylake and VAAPI 0.39.1 (not yet released).
  
  Also increases the allowed range of the quality option - in low-power
  
  mode, the Intel driver supports levels 1-8 (and 0 meaning default).
  

  • [DBH] libavcodec/vaapi_encode_h264.c

• When recording MP4 using ffmpeg suddenly power off

  2 décembre 2016, par wanglx

  Now I used C language and ffmpeg realize a multiplex real-time audio and video to MP4 files of the program and everything works fine, but when in the process of reuse of sudden power failure, the recording is MP4 file is damaged, VLC can not play this file.
  I think reason is no call to write the trailer function av_write_trailer , causing index and time stamp information lost, I use araxis merge tool compared the successful call av_write_trailer function of file and a no av_write_trailer to call the damaged files and found two different points :
  1. Damaged files in the file header box number value not right
  2. The damaged file no end of file.

  Now I want to repair after power on my program can automatically repair the damaged files, in Google did not find effective methods.
  my train of thought is in the normal recording process saves per second a damaged file is missing two information : box number and end of file, save it to a local file, when writing the MP4 file integrity delete this file after, if power off damaged, then in the next power, read the file and the corresponding information to write the damaged files corresponding position to. But now the problem is that I don’t know how to save the number of box and the end of the file, I this is feasible ? If possible, what should I do ? Looking forward to your reply !