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• Android : How to make camera capture video only of preview size and not full screen ?

  13 décembre 2017, par Ashutosh Tiwari

  I am working on an app that needs to capture square videos just like Instagram. I used many libraries for the purpose but none helped to capture the video itself in square size. I can make the preview look like square but not the recorded video. For that I have to use FFMPEG library for cropping the video after it has been captured. But this process takes too long for 1 minute videos even with 480p video capture quality. Someone please guide me to achieve this task.

  Libraries that I have used are :
  https://github.com/natario1/CameraView for cameraView and http://writingminds.github.io/ffmpeg-android-java/ for using ffmpeg.

  Commands that I have tried for ffmpeg cropping operation are :

  command = new String[]{"-y",
  
                  "-f",
  
                  "concat",
  
                  "-safe",
  
                  "0",
  
                  "-i",
  
                  "" + sdCardPathFile,
  
                  "-c:v",
  
                  "libx264",
  
                  "-vf",
  
                  "crop=" + getVideoResolution(),
  
                  "-preset",
  
                  "ultrafast",
  
                  "-qscale",
  
                  "0",
  
                  "-crf",
  
                  "28",
  
                  "-c:a",
  
                  "copy",
  
                  "-flags",
  
                  "+global_header",
  
                  "" + joinedVideoFile.getAbsolutePath()
  
          };
  
  
  
  
  
  
  
  
  
  String[] joinCommand = new String[]{
  
                  "-y",
  
                  "-f",
  
                  "concat",
  
                  "-safe",
  
                  "0",
  
                  "-i",
  
                  "" + sdCardPathFile,
  
                  "-filter:v",
  
                  "crop=480:480",
  
                  "-preset",
  
                  "superfast",
  
                  "-c:a",
  
                  "copy",
  
                  "" + joinedVideoFile.getAbsolutePath()
  
          };

• FFMPEG mp3 file segmentation on Mac OSx Error . Only one full mp3 file generated as segmented file

  2 novembre 2017, par iThirst

  What I am trying to achieve is to take an MP3 file as source file and generate multiple segments of approx 10s each from it. I am using node’s fluent ffmpeg inside node js application. Below code works absolutely fine and generates proper results on Linux/Ubuntu 16.04 server while fails with below error on mac osx. It ends by generating single .mp3 file and .m3u8 playlist file on mac osx while it generates multiple segmented mp3 files (each 11s) if executed on ubuntu server.

  Error Log: 
  
  [mp3 @ 0x7fc469010c00] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 9223372036854422218 >= -9223372033278215478
  
  [segment @ 0x7fc469006a00] Packets poorly interleaved, failed to avoid negative timestamp -9223372033277846838 in stream 0.

  // Node js code to execute ffmpeg command is given below

  var command = ffmpeg(fs.createReadStream(directoryPath + fileName), {timeout : 900})
  
                      .inputFormat('mp3')
  
                      .inputOptions([                    
  
                          //'-re',
  
                          //'-i input.mp3',
  
                          //directoryPath +'albumart.jpg',
  
                          '-codec copy',
  
                          '-map 0',
  
                          '-f segment',
  
                          '-segment_list ' + directoryPath + fileName_noExtension + '.m3u8',
  
                          '-segment_list_flags +live',
  
                          '-segment_time 10',
  
                           directoryPath + 'out%03d.mp3'
  
                      ]);
  
   command.on('start',{}).on('stderror').on('end').output(directoryPath +  'Out.mp3')
  
          .run()

  //

  Any help is appreciated in this direction.

• swscale : more accurate DITHER_COPY macro for full and limited range

  6 octobre 2017, par Mateusz

  swscale : more accurate DITHER_COPY macro for full and limited range
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libswscale/swscale_unscaled.c
  • [DH] tests/ref/vsynth/vsynth1-ffvhuff420p12
  • [DH] tests/ref/vsynth/vsynth1-vc2-420p10
  • [DH] tests/ref/vsynth/vsynth1-vc2-420p12
  • [DH] tests/ref/vsynth/vsynth2-ffvhuff420p12
  • [DH] tests/ref/vsynth/vsynth2-vc2-420p10
  • [DH] tests/ref/vsynth/vsynth2-vc2-420p12
  • [DH] tests/ref/vsynth/vsynth3-ffvhuff420p12
  • [DH] tests/ref/vsynth/vsynth_lena-ffvhuff420p12
  • [DH] tests/ref/vsynth/vsynth_lena-vc2-420p10
  • [DH] tests/ref/vsynth/vsynth_lena-vc2-420p12