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• WMA Lossless and ProRes Encoder

  4 mars 2012, par Multimedia Mike — General

  The projects (FFmpeg / Libav) just got a WMA lossless decoder. For those keeping score, this means that there are open source methods for decoding every single one of Microsoft’s proprietary audio codecs (Windows Media Audio, or WMA) : WMA v1, WMA v2, WMA9/Pro, WMA Voice, and now WMA lossless. Currently, it’s only advertised to decode 16-bit audio (no 24-bit). Also, when I first tried it a few days ago, it didn’t decode the very end of the single sample file I concocted many years ago (luckynight.wma). But that might be cleared up by now.

  Some other recent developments in the projects that I wanted to call out : An encoder for the Apple ProRes encoder from Kostya ; XWD (X window dump) image decoding and encoding from Paul B. Mahol ; a Sun rasterfile encoder from Aneesh Dogra.

  And then there’s the new playback system for CDXL files, also courtesy of Paul B. Mahol. I wasn’t familiar with this format until I wrote this post, which is surprising, given the format’s vintage. This was a CD-ROM FMV format favored for Amiga computers. Here it is in all its 160x120x10fps glory :

  
  
  

  That’s the amigaball.cdxl sample available in the repository. The sample is 3835910 bytes large and plays for about 24 seconds. This yields a data rate of about 159 kbytes/second. So, yeah, single-speed CD-ROM FMV.

• Android FFMPEG command line for video filter

  4 février 2014, par user2568369

  I am using following command to add retro effect in video.

  String[] ffmpegCommand = {"/data/data/com.mobvcasting.mjpegffmpeg/ffmpeg", "-r", ""+p.getPreviewFrameRate(), "-b", "1000000", "-vcodec", "mjpeg", "-i", Environment.getExternalStorageDirectory().getPath() + "/com.mobvcasting.mjpegffmpeg/frame_%05d.jpg","-vcodec", "mjpeg", "-acodec","libfaac","-vf","curves=vintage", "-qscale", "3", "-async", "1", "-y",Environment.getExternalStorageDirectory().getPath() + "/com.mobvcasting.mjpegffmpeg/video.mp4"};
  
  
  
  ffmpegProcess = new ProcessBuilder(ffmpegCommand).redirectErrorStream(true).start();            
  
  
  
  BufferedReader reader = new BufferedReader(new InputStreamReader(ffmpegProcess.getInputStream()));

  but I am getting following error :

  09-02 13:42:57.343: V/MJPEG_FFMPEG(2346): Finished Writing Frame
  
  09-02 13:42:57.351: V/MJPEG_FFMPEG(2346): Recording Stopped
  
  09-02 13:42:57.414: V/MJPEG_FFMPEG(2346): ***Starting FFMPEG***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  built on Jul 28 2011 16:47:07 with gcc 4.4.3***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --sysroot=/Developer/android-ndk-r5b//platforms/android-3/arch-arm --soname-prefix=/data/data/com.mobvcasting.mjpegffmpeg/ --enable-shared --disable-symver --enable-small --optimization-flags=-O2 --enable-encoder=mpeg2video --enable-encoder=nellymoser --enable-protocol=file --prefix=../build/ffmpeg/armeabi --extra-cflags= --extra-ldflags=***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavutil     50.34. 0 / 50.34. 0***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavcore      0.16. 0 /  0.16. 0***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavcodec    52.99. 1 / 52.99. 1***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavformat   52.88. 0 / 52.88. 0***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavdevice   52. 2. 2 / 52. 2. 2***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libavfilter    1.69. 0 /  1.69. 0***
  
  09-02 13:42:57.460: V/MJPEG_FFMPEG(2346): ***  libswscale     0.12. 0 /  0.12. 0***
  
  
  
  09-02 13:42:57.648: V/MJPEG_FFMPEG(2346): ***Input #0, image2, from '/mnt/sdcard/com.mobvcasting.mjpegffmpeg/frame_%05d.jpg':***
  
  09-02 13:42:57.656: V/MJPEG_FFMPEG(2346): ***  Duration: 00:00:01.83, start: 0.000000, bitrate: N/A***
  
  09-02 13:42:57.656: V/MJPEG_FFMPEG(2346): ***    Stream #0.0: Video: mjpeg, yuvj420p, 320x240 [PAR 1:1 DAR 4:3], 30 fps, 30 tbr, 30 tbn, 30 tbc***
  
  09-02 13:42:57.695: V/MJPEG_FFMPEG(2346): ***[buffer @ 0x5d110] w:320 h:240 pixfmt:yuvj420p***
  
  09-02 13:42:57.695: V/MJPEG_FFMPEG(2346): ***No such filter: 'curves'***
  
  09-02 13:42:57.695: V/MJPEG_FFMPEG(2346): ***Error opening filters!***
  
  09-02 13:42:57.695: V/MJPEG_FFMPEG(2346): ***Ending FFMPEG***

  Any help will be highly appreciated.

• Error of FFmpeg on Java in "av_image_copy_to_buffer" method during decoding H.264 stream

  26 mai 2020, par maru2213

  I'm trying to decode H.264 stream, which is sent over Socket from an Android application to a computer. And I also want to show the decoded stream using JavaFX. I searched for a long time, and decided to use JavaCV / FFmpeg. However I got error from FFmpeg. (I was inspired by this code.)

  



  Questions :

  



  

  • Why does FFmpeg make error ?

  


  • Is it a correct way to convert AVFrame to javafx.scene.image.Image ?

  


  



  I'm using :

  



  

  • javacv-platform 1.4.4

  


  • ffmpeg-platform 4.1-1.4.4

  


  



  Code :

  



  This is a part of import and class fields, and method which runs once at the first time. (Actually the content of initialize() is wrapped by try catch.)

  



      import javafx.scene.image.Image;

    private avcodec.AVCodec avCodec;
    private avcodec.AVCodecContext avCodecContext;
    private avutil.AVDictionary avDictionary;
    private avutil.AVFrame avFrame;

    public void initialize() {
        avCodec = avcodec_find_decoder(AV_CODEC_ID_H264);
        if (avCodec == null) {
            throw new RuntimeException("Can't find decoder");
        }
        avCodecContext = avcodec_alloc_context3(avCodec);
        if (avCodecContext == null) {
            throw new RuntimeException("Can't allocate decoder context");
        }
        int result = avcodec_open2(avCodecContext, avCodec, (AVDictionary) null);
        if (result < 0) {
            throw new RuntimeException("Can't open decoder");
        }
        avFrame = av_frame_alloc();
        if (avFrame == null) {
            throw new RuntimeException("Can't allocate frame");
        }
    }


  



  And this is a method which is called every time when I receive a packet from Android. byte[] data is the packet data starting with 0x00, 0x00, 0x00, 0x01.

  



  The place where I get error is number_of_written_bytes. It always gets <0.

  &#xA;&#xA;

      private void decode(byte[] data) {
        AVPacket avPacket = new AVPacket();
        av_init_packet(avPacket);
        avPacket.pts(AV_NOPTS_VALUE);
        avPacket.dts(AV_NOPTS_VALUE);
        BytePointer bytePointer = new BytePointer(data);
        bytePointer.capacity(data.length);
        avPacket.data(bytePointer);
        avPacket.size(data.length);
        avPacket.pos(-1);

        avcodec_send_packet(avCodecContext, avPacket);
        int result = avcodec_receive_frame(avCodecContext, avFrame);
        if (result >= 0) {
            int bufferOutputSize = av_image_get_buffer_size(avFrame.format(), avFrame.width(), avFrame.height(), 16);
            Pointer pointer = av_malloc(bufferOutputSize);
            BytePointer outputPointer = new BytePointer(pointer);
            int number_of_written_bytes = av_image_copy_to_buffer(outputPointer, bufferOutputSize, avFrame.data(), avFrame.linesize(), avFrame.chroma_location(), avFrame.width(), avFrame.height(), 1);
            if (number_of_written_bytes < 0) {
                //The process always come here.
                throw new RuntimeException("Can't copy image to buffer");
            }

            System.out.println("decode success");
            Image image = new Image(new ByteArrayInputStream(outputPointer.asBuffer().array()));
        } else {
            System.out.println("decode failed");
        }
    }


  &#xA;&#xA;

  Anything is helpful for me. Thanks.

  &#xA;