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• ffmpeg not generating palettes

  2 décembre 2018, par sk84z

  I downloaded ffmpeg and ran the command found in the documentation to generate palettes :

  ffmpeg -i input.mkv -vf palettegen palette.png

  The only difference being my input was input.mp4 instead of input.mkv.

  No file gets generated. Here’s the console output from PowerShell :

  ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers  
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp41isom
  
      creation_time   : 2018-11-23T23:27:38.000000Z
  
    Duration: 00:00:09.98, start: 0.000000, bitrate: 2784 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 580x328 [SAR 1:1 DAR 145:82], 2699 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : AVC Coding
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 79 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'palette.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp41isom
  
      encoder         : Lavf57.83.100
  
      Stream #0:0(und): Video: png, rgba, 16x16 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-11-23T23:27:38.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : Lavc57.107.100 png
  
  [Parsed_palettegen_0 @ 00000296510def00] 255(+1) colors generated out of 285516 colors; ratio=0.000893
  
  [Parsed_palettegen_0 @ 00000296510def00] Dupped color: FF000001

  Any ideas ?

• Using ffmpeg to scale app preview videos for the AppStore

  1er décembre 2018, par Felipe Ferri

  I’m generating an app preview video to send to the AppStore. Depending on the device type, the AppStore requires certain video resolutions.

  I have a main video, with resolution 1920x1080, which I was able to upload.

  I need to generate another video with the resolution 1920x886 for supporting 6.5" devices, so I used the following command to perform the scaling :

  ffmpeg -i video_1920_1080.mp4 -vf scale=1920:886 -c:a copy video_1920_886.mp4

  If I get the info for the generated video using ffmpeg -i I get the following result :

  ffmpeg -i video_1920_886.mp4
  
  
  
  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hittin_1920_886.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 00:00:29.13, start: 0.000000, bitrate: 705 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x886 [SAR 443:540 DAR 16:9], 694 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        timecode        : 00:00:10:20
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
  
      Metadata:
  
        handler_name    : TimeCodeHandler
  
        timecode        : 00:00:10:20

  Ok, so it seems the output video is in the correct 1920x886 resolution.

  However, when I try to upload this video the AppStore complains that the video is in the incorrect resolution.

  If I open the file properties window on macos, the following information appears for the same video :

  

  And, if I open the same video on VLC, I can see the following info on the Media Info screen :

  

  So :

  1. ffmpeg -i tells me the video is in the resolution 1920x886.
  2. macos file properties tells me the video is in the resolution 1575x886.
  3. VLC tells me the video has a Resolution of 1920x898 and a Display Resolution of 1920x886.

  Why are there three different resolutions ? How can I change each one of them ? I suppose the appstoreconnect website expects the file properties resolution to be 1920x886. How can I change that ?

• ffmpeg - ffmpeg aws lamnda function error

  30 novembre 2018, par Pramod Gehlot

  I am getting error

  Execution result : failed(logs)
  Details

  The area below shows the result returned by your function execution. Learn more about returning results from your function.

  {
  
    "errorMessage": "RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Process exited before completing request"
  
  }

  Summary

  Code SHA-256
  
  ca50xloHl4xLOSWox2xidHxC1VHyNqwq3kECKraw7/c=
  
  Request ID
  
  eb7906af-f46d-11e8-ae3b-45487c02a68e
  
  Duration
  
  38.73 ms
  
  Billed duration
  
  100 ms
  
  Resources configured
  
  128 MB
  
  Max memory used
  
  19 MB

  Log output

  The section below shows the logging calls in your code. These correspond to a single row within the CloudWatch log group corresponding to this Lambda function. Click here to view the CloudWatch log group.

  START RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Version: $LATEST
  
  2018-11-30T07:02:38.509Z    eb7906af-f46d-11e8-ae3b-45487c02a68e    TypeError: Cannot create property 'stack' on string 'Could not find ffmpeg executable, tried "/var/task/node_modules/@ffmpeg-installer/linux-x64/ffmpeg" and "/var/task/node_modules/@ffmpeg-installer/ffmpeg/node_modules/@ffmpeg-installer/linux-x64/ffmpeg"'
  
  
  
  END RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e
  
  REPORT RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e  Duration: 38.73 ms  Billed Duration: 100 ms     Memory Size: 128 MB Max Memory Used: 19 MB  
  
  RequestId: eb7906af-f46d-11e8-ae3b-45487c02a68e Process exited before completing request