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• sdp : Simplify parsing/conversion of H264 extradata

  3 octobre 2014, par Martin Storsjö

  sdp : Simplify parsing/conversion of H264 extradata
  By using ff_avc_write_annexb_extradata instead of the h264_mp4toannexb
  
  BSF, the code for doing the conversion itself is kept much shorter,
  
  there’s less state to restore at the end, we don’t risk leaving the
  
  AVCodecContext in an inconsistent state if returning early due to
  
  errors, etc.
  Also add a missing free if the base64 encoding fails.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/sdp.c

• ffmpeg codec error on audio file

  31 juillet 2013, par foosion

  I have some m4a files that will not play properly using the google music player app on my Android phone, although they play fine on most everything else. I thought the problem was the container and thought "ffmpeg -i bad.m4a -codec copy good.m4a" might help. However, when I run on the problem files, I get error messages. Running this command on non-problem files has not generated error messages.

  Please suggest ways to fix (other than re-encoding).

      [D:\temp\dl]ffmpeg -i "01 - The Day Begins.m4a" -codec copy day.m4a
  
  ffmpeg version N-55066-gc96b3ae Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 29 2013 18:05:45 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000002da300] stream 0, timescale not set
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '01 - The Day Begins.m4a':
  
    Metadata:
  
      major_brand     : m4a
  
      minor_version   : 0
  
      compatible_brands: M4A mp4isom
  
      creation_time   : 2003-07-06 20:27:46
  
      track           : 1
  
      genre           : Rock
  
      title           : The Day Begins
  
      artist          : Moody Blues
  
      album           : Days of Future Passed
  
      date            : 1967
  
    Duration: 00:05:50.83, start: 0.000000, bitrate: 166 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 15
  
  9 kb/s
  
      Metadata:
  
        creation_time   : 2003-07-06 20:27:46
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(eng): Data: none (mp4s / 0x7334706D)
  
      Metadata:
  
        creation_time   : 2003-07-06 20:27:46
  
        handler_name    : Apple MPEG-4 Scene Media Handler
  
      Stream #0:2(eng): Data: none (mp4s / 0x7334706D)
  
      Metadata:
  
        creation_time   : 2003-07-06 20:27:46
  
        handler_name    : Apple MPEG-4 ODSM Media Handler
  
      Stream #0:3: Video: png, rgb24, 240x240 [SAR 2834:2834 DAR 1:1], 90k tbr, 90
  
  k tbn, 90k tbc
  
  [ipod @ 000000000031dd40] track 0: could not find tag, codec not currently suppo
  
  rted in container
  
  Output #0, ipod, to 'day.m4a':
  
    Metadata:
  
      major_brand     : m4a
  
      minor_version   : 0
  
      compatible_brands: M4A mp4isom
  
      date            : 1967
  
      track           : 1
  
      genre           : Rock
  
      title           : The Day Begins
  
      artist          : Moody Blues
  
      album           : Days of Future Passed
  
      encoder         : Lavf55.12.102
  
      Stream #0:0: Video: png, rgb24, 240x240 [SAR 2834:2834 DAR 1:1], q=2-31, 90k
  
   tbn, 90k tbc
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, 159 kb/s
  
  
  
      Metadata:
  
        creation_time   : 2003-07-06 20:27:46
  
        handler_name    : Apple Sound Media Handler
  
  Stream mapping:
  
    Stream #0:3 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Error
  
  number -1 occurred

• Crop and pinch zoom image with FFMPEG

  27 septembre 2022, par hugger

  I am working on a simple photo editor component for a mobile app which requires the user to be able to pan and scale (zoom) an image to be cropped. S/O to @kesh for the help so far !

  


  With the pinch zoom value which ranges from 1-5, I wish to use this in my FFMPEG execution along with the crop command :

  


    cropSelected() {
    this.setState({ isCropping: true });

    const diff =
      this.props.videoHeight / (this.state.aspectRatio * deviceWidth);
    const offsetDiff = this.state.offsetTopTranslate * diff;

    var filterPathPostCrop =
      this.props.type === 'photo'
        ? RNFS.DocumentDirectoryPath + '/afterCrop.png'
        : this.props.type === 'gif'
        ? RNFS.DocumentDirectoryPath + '/afterCrop.gif'
        : RNFS.DocumentDirectoryPath + '/afterCrop.mp4';
    //hardcoded zoom at 1.2x for example!
    FFmpegKit.execute(
      `-y -i ${this.state.mediaSource} -vf "crop=iw/1.2:ih/1.2:0:${offsetDiff},scale=iw:-1" -qscale 0 -frames:v 1 ${filterPathPostCrop}`
    ).then(async (session) => {
      const returnCode = await session.getReturnCode();
      if (ReturnCode.isSuccess(returnCode)) {
        // SUCCESS

        Animated.spring(this._pinchScale, {
          toValue: 1,
          useNativeDriver: true,
        }).start();

        this.setState(
          {
            mediaSource: filterPathPostCrop,
            videoSourcePreview: `${filterPathPostCrop}?${new Date().getTime()}`,
            ffMPEGinProgress: null,
            aspectRatio: 1080 / 1080,
            videoTime: 0,
            isPlayingVideo: false,
            isCropping: false,
            filterOutputIsAlt: !this.state.filterOutputIsAlt,
            wasCropped: true,
          });
      } else if (ReturnCode.isCancel(returnCode)) {
        // CANCEL
      } else {
        // ERROR
        alert('error');
      }
    });
  }


  


  I drew this to illustrate what I am trying to achieve here.

  


  

  


  I hope this helps !