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• avformat/mp3dec : Subtract known padding from duration

  22 août 2023, par Ulrik Mikaelsson

  avformat/mp3dec : Subtract known padding from duration
  When an Info-tag is present, marking initial and trailing samples as
  
  padding, those samples should not be included in the calculation of track
  
  duration.
  This solves a surprising user experience where converting a WAV->MP3->WAV,
  
  ffprobe will show the duration of the mp3 as slightly longer than both the
  
  input and the output.
  As a result, the estimated duration and imprecise seek-results of some
  
  FATE-tests have been updated.
  

  • [DH] libavformat/mp3dec.c
  • [DH] tests/ref/fate/gapless-mp3-side-data
  • [DH] tests/ref/seek/extra-mp3

• With FFMPEG, create thumbnails proportional to the video's ratio [closed]

  28 janvier 2013, par Felipe Schenone

  I'm using the following command to create thumbnails with FFMPEG :

  ffmpeg -itsoffset -1 -i video.avi -vcodec mjpeg -vframes 1 -an -f rawvideo -s 240x180 image.png

  And it works fine. However, when the video isn't 4:3 ratio, it will still create a 240x180 image, and the extra space will be painted black. Is there some variation of the command that will prevent this and give me an image proportional to the video's ratio ? In other words, I want 240x180 to be the maximum size of the thumbnail, but not the minimum.

  Extra points if the command creates a smaller image when the video is smaller than 240x180.

• FFmpeg On iOS can’t find delogo

  8 mai 2018, par Y.Y.Doe

  I integrated FFmpeg on iOS，and use “delogo” to clean watermark，but it does not work.
  And it logs :

  No such filter:delogo

  I don’t know why,and I need help

  it’s my iOS code to use FFmpeg

  dispatch_async(dispatch_get_global_queue(0, 0), ^{
  
      char *outPic = (char *)[DocumentPath(@"delogo.mp4") UTF8String];
  
      char *movie = (char *)[BundlePath(@"logo.mp4") UTF8String];
  
      char *a[] = {
  
          "ffmpeg",
  
          "-i",
  
          movie,
  
          "-vf",
  
          "delogo=x=10:y=10:w=250:h=120:show=1",
  
          outPic
  
      };
  
      ffmpeg_main(sizeof(a)/sizeof(*a),a);
  
  });

  my total log

  ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
 built with Apple LLVM version 7.3.0 (clang-703.0.31)
 configuration: --target-os=darwin --arch=arm64 --cc='xcrun -sdk iphoneos clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch arm64 -mios-version-min=6.0 -fembed-bitcode' --extra-ldflags='-arch arm64 -mios-version-min=6.0 -fembed-bitcode' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/arm64
 WARNING: library configuration mismatch
 avutil      configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avcodec     configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avformat    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avdevice    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 avfilter    configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 swscale     configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 swresample  configuration: --target-os=darwin --arch=x86_64 --cc='xcrun -sdk iphonesimulator clang' --enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic --extra-cflags='-arch x86_64 -mios-simulator-version-min=6.0' --extra-ldflags='-arch x86_64 -mios-simulator-version-min=6.0' --prefix=/Users/lxh/Desktop/FFmpeg-iOS-build-script-master/thin/x86_64
 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
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/daiyangyang/Library/Developer/CoreSimulator/Devices/02A8BC3F-5E46-453A-A3B4-A42563C518EA/data/Containers/Bundle/Application/4E0BB47F-5D3E-42A3-BC76-2D7D03657870/去水印.app/logo.mp4':
 Metadata:
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2mp41
   encoder         : Lavf57.25.100
 Duration: 00:02:31.37, start: 0.023220, bitrate: 472 kb/s
   Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x352 [SAR 1:1 DAR 20:11], 338 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
   Metadata:
     handler_name    : VideoHandler
   Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
   Metadata:
     handler_name    : SoundHandler
[AVFilterGraph @ 0x7fbabb519e00] No such filter: 'delogo'
Error opening filters!

  I integrated FFmpeg by "FFmpeg-iOS-build-script"(https://github.com/kewlbear/FFmpeg-iOS-build-script)