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• BisonCam NB Pro not working correctly in VMware Xubuntu 16.04

  29 août 2016, par bot1131357

  I am trying to access my webcam (BisonCam, NB Pro) on a VMWare Xubuntu 16.04 virtual machine using ffmpeg, but it’s not working. Here’s what I did :

  $ ./ffmpeg -f v4l2 -i /dev/video0 ~/Dev/out.avi
  
  ffmpeg version N-81392-ga453bbb Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 20160609
  
    configuration: --pkg-config-flags=--static --enable-shared --enable-pic --enable-libvpx --prefix=/home/ytan/Dev/build-x64
  
    libavutil      55. 29.100 / 55. 29.100
  
    libavcodec     57. 54.100 / 57. 54.100
  
    libavformat    57. 47.101 / 57. 47.101
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 52.100 /  6. 52.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100

  The webcam LED turned on, but the console remained like that for as long as I let it. When I press ’Ctrl + c’, the following message is returned :

  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, bitrate: 88473 kb/s
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, 88473 kb/s, 6 fps, 6 tbr, 1000k tbn, 1000k tbc
  
  File '/home/ytan/Dev/out.avi' already exists. Overwrite ? [y/N] y
  
  [avi @ 0x1f4a680] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, avi, to '/home/ytan/Dev/out.avi':
  
    Metadata:
  
      ISFT            : Lavf57.47.101
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720, q=2-31, 200 kb/s, 6 fps, 6 tbn, 6 tbc
  
      Metadata:
  
        encoder         : Lavc57.54.100 mpeg4
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
  
  Could not write header for output file #0 (incorrect codec parameters ?): Immediate exit requested
  
  Exiting normally, received signal 2.

  At this point I figured that somehow ffmpeg isn’t able to read the frames from the webcam. Just to double-check, I tried running cheese to see if the issue is not exclusive to ffmpeg, and I was right. Here is a screenshot.

  Can someone help me with this ?

• Set fake duration on h264 video

  1er février 2017, par Ibrahim

  I have a script that fetches multiple chunks of a video from one place and streams it as a single video to other place (to Kodi player).

  Everything seems to work fine except one thing that bothers me, the player doesn’t seem to know how long the video is, therefore the total duration increments as the video plays.

  I do know the duration of the video from an xml file that contains a link to all the chunks, but I don’t know how to write that in the metadata of the first chunk.

  The video codec is h264, but I’m not sure if it is wrapped in some container, like mp4.

  Here is the ffmpeg -i output for the first chunk :

  ffmpeg version 3.1.5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.38)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.1.5 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --disable-lzma --enable-vda
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [mpegts @ 0x7fc3c6000000] start time for stream 0 is not set in estimate_timings_from_pts
  
  Input #0, mpegts, from '/Users/ibra/Desktop/daTgXic4JOI.ts':
  
    Duration: 00:00:17.56, start: 0.000000, bitrate: 1220 kb/s
  
    Program 1 
  
      Stream #0:0[0x102]: Data: timed_id3 (ID3  / 0x20334449)
  
      Stream #0:1[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:2[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 150 kb/s

  And here is a messy screenshot of the file opened in a hex editor :
  https://www.evernote.com/l/AWlILw5PcmVEl4fSFitOfS2M8Wzy1WTVSZc

  Any suggestions of how to insert the video duration in the metadata of the first chunk ?

  I cannot download the all the chunks and then concat in a single file because this will take too much time and the streaming must be instantly.

• Android ffmpeg library use

  30 octobre 2017, par m.skolimowski

  I’m pretty new to use of ffmpeg library. I used this http://writingminds.github.io/ffmpeg-android-java/ to add library to my android studio project. It works well when I run the command -version or -devices
  However when I try any command with -i beginning like for example -i video.avi I get the error :

  onFailure : ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.8 (GCC) configuration : —target-os=linux —cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- —arch=arm —cpu=cortex-a8 —enable-runtime-cpudetect —sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot —enable-pic —enable-libx264 —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-fontconfig —enable-pthreads —disable-debug —disable-ffserver —enable-version3 —enable-hardcoded-tables —disable-ffplay —disable-ffprobe —enable-gpl —enable-yasm —disable-doc —disable-shared —enable-static —pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config —prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a —extra-cflags=’-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all’ —extra-ldflags=’-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie’ —extra-libs=’-lpng -lexpat -lm’ —extra-cxxflags=
  libavutil 55. 17.103 / 55. 17.103 libavcodec 57. 24.102 / 57. 24.102 libavformat 57. 25.100 / 57. 25.100 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 31.100 / 6. 31.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 Unrecognized option ’i /storage/emulated/0/Movies/test4.avi’. Error splitting the argument list : Option not found

  Am I doing something wrong ? ANybody have idea why basic command like "-i" doesnt work ?