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• Error opening filters : Running ffmpeg through Groovy and ProcessBuilder

  30 octobre 2016, par smeeb

  This question involves the popular Linux media processing utility "ffmpeg", but I think its really a Java 8 ProcessBuilder question at its core. Or possibly an issue w/ Groovy GStrings.

  The ffmpeg command to split an MP4 video into frames/images based on a sampling rate is :

  ffmpeg -i /some/path/to/video.mp4 -vf "select=not(mod(n\,${samplingRate}))" -vsync vfr -q:v 2 img_%d.jpg

  Where ${samplingRate} is a positive integer and represents the number of frames to skip in between creating each frame. So for instance, if you had a video with 430 frames in it, and wanted to sample every 50th frame, your command would be :

  ffmpeg -i /some/path/to/video.mp4 -vf "select=not(mod(n\,50))" -vsync vfr -q:v 2 img_%d.jpg

  Which would then create 8 (or maybe 9, not gonna do the math for a pretend example) JPG files called img_1.jpg, img_2.jpg, ...etc. The first image would be the 50th frame in the video. The second image would be the 100th frame, etc. I have ran the above command directly from a terminal and confirmed that it is correct and succeeds without errors.

  I have a Groovy app, and am trying to run this ffmpeg command via a Java 8 ProcessBuilder, and am having issues with the select= argument. Currently I have :

  int numSamples = 50
  
  Process frameSamplerProc = new ProcessBuilder(
  
      'ffmpeg',
  
      '-i',
  
      "/home/myuser/some/path/to/video.mp4",
  
      '-vf',
  
      "\"select=not(mod(n\\,${numSamples}))\"",
  
      '-vsync',
  
      'vfr',
  
      '-q:v',
  
      '2',
  
      'sample%d.jpg'
  
  ).redirectErrorStream(true).start()
  
  
  
  frameSamplerProc.inputStream.eachLine { fsamplerLine ->
  
      println(fsamplerLine)
  
  }

  When I run thise code, I don’t get any errors, but I do see errors in ffmpeg’s output :

  ffmpeg version N-81995-gd790e48 Copyright (c) 2000-2016 the FFmpeg developers
  
  // Omitting the next ~50 lines of output as it all looks normal
  
  
  
  Metadata:
  
    creation_time   : 2016-10-27T20:20:01.000000Z
  
    handler_name    : SoundHandle
  
  [AVFilterGraph @ 0x3eddc80] No such filter: '"select'
  
  Error opening filters!

  I’m wondering if I’m not escaping the select argument properly or if I’m passing in a bad array to the ProcessBuilder. Can anybody spot where I’m going awry ?

• Video won't play on iphone

  18 octobre 2016, par Merc

  I have an app that places videos online, and cannot find a way to get iPhones to actually play them.

  ffprobe says :

    merc@mercs-thinkpad:/disk/home/merc/Downloads$ ffprobe 5801005ff1861ba1729757fbffprobe version 2.8.8-0ubuntu0.16.04.1 Copyright (c) 2007-2016 the FFmpeg developers
  
      built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 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
  
      WARNING: library configuration mismatch
  
      avcodec     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 --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
      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
  
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '5801005ff1861ba1729757fb':
  
      Metadata:
  
        major_brand     : isom
  
        minor_version   : 512
  
        compatible_brands: isomiso2avc1mp41
  
        encoder         : Lavf57.50.100
  
      Duration: 00:00:12.37, start: 0.021333, bitrate: 993 kb/s
  
        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 928 kb/s, 29.83 fps, 29.83 tbr, 11456 tbn, 59.67 tbc (default)
  
        Metadata:
  
          handler_name    : VideoHandler
  
        Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 70 kb/s (default)
  
        Metadata:
  
          handler_name    : SoundHandler

  The video is here

  The file was created using ffmpeg from within the app.

  Is this a codec problem ? What shall I do to make sure iPhones can actually play them ?

• FFMPEG Cannot Init CUDA

  7 novembre 2016, par Alan

  I am working to install ffmpeg with hardware GPU support on a Xenserver virtual server (Ubuntu 16.04). I am following the guide from : http://developer.download.nvidia.com/compute/redist/ffmpeg/1511-patch/FFMPEG-with-NVIDIA-Acceleration-on-Ubuntu_UG_v01.pdf

  While updating the directions for the newest versions of the SDK and versions for 16.04. I have everything built and all seems fine when doing version checks :

  ffmpeg version N-82277-ge2193b5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 20160609
  
    configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static 
  
  --extra-cflags=-I/root/ffmpeg_build/include
  
  --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-libass --enable-libfdk-aac 
  
  --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx 
  
  --enable-libx264 --enable-libx265 --enable-libvidstab --enable-nonfree --enable-nvenc
  
  
  
  #nvcc --version
  
  nvcc: NVIDIA (R) Cuda compiler driver
  
  Copyright (c) 2005-2015 NVIDIA Corporation
  
  Built on Tue_Aug_11_14:27:32_CDT_2015
  
  Cuda compilation tools, release 7.5, V7.5.17

  When I try doing the test using the GPU I get this :

  #time ffmpeg -y -i 337.mp4 -vcodec h264_nvenc -b:v 5M -acodec copy OUTPUT.mp4
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '337.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:22.74, start: 0.000000, bitrate: 537 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 434 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 96 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  modprobe: ERROR: could not insert 'nvidia_367_uvm': No such device
  
  [h264_nvenc @ 0x3da6400] Cannot init CUDA
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
  
    Stream #0:1 -> #0:1 (copy)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  In particular I get an error [h264_nvenc @ 0x3da6400] Cannot init CUDA

  I can’t seem to find any info on this. I am not running any desktop GUI, strictly command line trying to accelerate video encoding with a Nvidia GTX 960.