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Sur d’autres sites (7177)

  • Transcoding audio using xuggler

    23 juin 2014, par amd

    I am trying to convert an audio file with the header

    Opening audio decoder: [pcm] Uncompressed PCM audio decoder
    
AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400)
    
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)

    I want to transcode this file to mp3 format. I have following code snippet but its not working well. I have written it using XUGGLER code snippet for transcoding audio and video.

    Audio decoder is

        audioDecoder = IStreamCoder.make(IStreamCoder.Direction.DECODING, ICodec.findDecodingCodec(ICodec.ID.CODEC_ID_PCM_S16LE));
    
    audioDecoder.setSampleRate(44100);
    
    audioDecoder.setBitRate(176400);
    
    audioDecoder.setChannels(2);
    
    audioDecoder.setTimeBase(IRational.make(1,1000));
    
    if (audioDecoder.open(IMetaData.make(), IMetaData.make()) < 0)
    
        return false;
    
    return true;

    Audio encoder is

        outContainer = IContainer.make();
    
    outContainerFormat = IContainerFormat.make();
    
    outContainerFormat.setOutputFormat("mp3", urlOut, null);
    
    int retVal = outContainer.open(urlOut, IContainer.Type.WRITE, outContainerFormat);
    
    if (retVal < 0) {
    
        System.out.println("Could not open output container");
    
        return false;
    
    }
    
    outAudioCoder = IStreamCoder.make(IStreamCoder.Direction.ENCODING, ICodec.findEncodingCodec(ICodec.ID.CODEC_ID_MP3));
    
    outAudioStream = outContainer.addNewStream(outAudioCoder);
    
    outAudioCoder.setSampleRate(new Integer(44100));
    
    outAudioCoder.setChannels(2);
    
    retVal = outAudioCoder.open(IMetaData.make(), IMetaData.make());
    
    if (retVal < 0) {
    
        System.out.println("Could not open audio coder");
    
        return false;
    
    }
    
    retVal = outContainer.writeHeader();
    
    if (retVal < 0) {
    
        System.out.println("Could not write output FLV header: ");
    
        return false;
    
    }
    
    return true;

    And here is encode method where i send packets of 32 byte to transcode

    public void encode(byte[] audioFrame){
    
    //duration of 1 video frame
    
    long lastVideoPts = 0;
    

    
    IPacket packet_out = IPacket.make();
    
    int lastPos = 0;
    
    int lastPos_out = 0;
    

    
    IAudioSamples audioSamples = IAudioSamples.make(48000, audioDecoder.getChannels());
    
    IAudioSamples audioSamples_resampled = IAudioSamples.make(48000, audioDecoder.getChannels());
    

    
    //we always have 32 bytes/sample
    
    int pos = 0;
    
    int audioFrameLength = audioFrame.length;
    
    int audioFrameCnt = 1;
    
    iBuffer = IBuffer.make(null, audioFrame, 0, audioFrameLength);
    
    IPacket packet = IPacket.make(iBuffer);
    
    //packet.setKeyPacket(true);
    
    packet.setTimeBase(IRational.make(1,1000));
    
    packet.setDuration(20);
    
    packet.setDts(audioFrameCnt*20);
    
    packet.setPts(audioFrameCnt*20);
    
    packet.setStreamIndex(1);
    
    packet.setPosition(lastPos);
    
    lastPos+=audioFrameLength;
    
    int pksz = packet.getSize();
    
    packet.setComplete(true, pksz);
    
    /*
    
    * A packet can actually contain multiple samples
    
    */
    
    int offset = 0;
    
    int retVal;
    
    while(offset < packet.getSize())
    
    {
    
        int bytesDecoded = audioDecoder.decodeAudio(audioSamples, packet, offset);
    
        if (bytesDecoded < 0)
    
            throw new RuntimeException("got error decoding audio ");
    
        offset += bytesDecoded;
    
        if (audioSamples.isComplete())
    
        {
    
            int samplesConsumed = 0;
    
            while (samplesConsumed < audioSamples.getNumSamples()) {
    
                retVal = outAudioCoder.encodeAudio(packet_out, audioSamples, samplesConsumed);
    
                if (retVal <= 0)
    
                    throw new RuntimeException("Could not encode audio");
    
                samplesConsumed += retVal;
    
                if (packet_out.isComplete()) {
    
                    packet_out.setPosition(lastPos_out);
    
                    packet_out.setStreamIndex(1);
    
                    lastPos_out+=packet_out.getSize();
    
                    retVal = outContainer.writePacket(packet_out);
    
                    if(retVal < 0){
    
                        throw new RuntimeException("Could not write data packet");
    
                    }
    
                }
    
            }
    
        }
    

    
    }
    

    
}

    I get an output file but it doesnt get played. I have very little experience of audio encoding and sampling. Thanks in advance.

  • ffmpeg conversion command to output to h.264 for iPad

    23 juin 2016, par janet-PCF

    I’m looking for a good (general) conversion command that will convert any input file to h.264 sized for the iPad.

    Currently I have this command that works, that was adapted from robert.swain

    With presets :

    $ ffmpeg -i INPUT -acodec aac -ab 160000 -s 1024x768 -vcodec libx264 \
    
         -vpre slow -vpre ipod640 -b 1200kb -threads 0 -f mp4 OUTPUT.mp4

    Long form, no presets :

    $ ffmpeg -i INPUT -acodec aac -ab 160000 -s 1024x768 -vcodec libx264 \
    
         -coder 1 -flags +loop -cmp +chroma \
    
         -partitions +parti8x8+parti4x4+partp8x8+partb8x8 -me_method umh \
    
         -subq 8 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 \
    
         -i_qfactor 0.71 -b_strategy 2 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 \
    
         -bf 3 -refs 5 -directpred 3 -trellis 1 \
    
         -flags2 +bpyramid+mixed_refs+wpred+dct8x8+fastpskip -wpredp 2 \
    
         -rc_lookahead 50 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 \
    
         -level 30 -maxrate 10000000 -bufsize 10000000 -wpredp 0 -b 1200k \
    
         -threads 0 -f mp4 OUTPUT.mp4

    Note : I’m skipping the aspect ratio because we handle that in the program, and we only resize it if the input resolution is greater than the output resolution.

    If there’s any suggestions for improvement, we are looking to balance speed, quality and conversion time.

  • Gsteamer rtp video mixer, found a working pipeline, however need improvement

    8 février 2015, par alkber

    I’m attempting to mix multiple rtp h264 payload video streams into a single video stream of 15FPS.

    A working pipeline that mixes two video streams over a videotestsource pattern of 15FPS

    VIDEO_CAPS="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264"
    

    
gst-launch -vvvve videomixer2 name=mix ! ffmpegcolorspace ! xvimagesink  
    

    
udpsrc caps=$VIDEO_CAPS port=3030 ! .recv_rtp_sink_0 gstrtpbin ! rtph264depay ! ffdec_h264  ! videoscale ! video/x-raw-yuv , width=176, height=144 ! videobox top=0 left=0 ! video/x-raw-yuv,format=\(fourcc\)AYUV ! ffmpegcolorspace !  mix.  
    

    
udpsrc caps=$VIDEO_CAPS port=6666 ! .recv_rtp_sink_0 gstrtpbin ! rtph264depay ! ffdec_h264  ! videoscale ! video/x-raw-yuv , width=176, height=144 ! videobox top=0 left=-178 ! video/x-raw-yuv,format=\(fourcc\)AYUV ! ffmpegcolorspace !  mix. 
    

    
videotestsrc ! video/x-raw-yuv, framerate=15/1, width=640, height=360 ! mix.

    Above pipeline has a strange issue, When attempting to mix, the first video source goes blank, (i’m certain that there is still streaming going on for the first video source, however it doesn’t turn up. Rather second video stream is shown. The verbose is given below.

    Verbose for the above pipeline

    /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, color-matrix=(string)sdtv
    
Pipeline is live and does not need PREROLL ...
    
Setting pipeline to PLAYING ...
    
New clock: GstSystemClock
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, color-matrix=(string)sdtv
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, color-matrix=(string)sdtv
    
/GstPipeline:pipeline0/GstVideoMixer2:mix.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1
    
/GstPipeline:pipeline0/GstVideoMixer2:mix.GstVideoMixer2Pad:sink_0: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, color-matrix=(string)sdtv
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpSession:rtpsession0.GstPad:recv_rtp_sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0.GstGhostPad:recv_rtp_sink_0: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0.GstGhostPad:recv_rtp_sink_0.GstProxyPad:proxypad0: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpSession:rtpsession0.GstPad:recv_rtp_src: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpSsrcDemux:rtpssrcdemux0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpJitterBuffer:rtpjitterbuffer0.GstPad:src: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpJitterBuffer:rtpjitterbuffer0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpSession:rtpsession1.GstPad:recv_rtp_sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1.GstGhostPad:recv_rtp_sink_0: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1.GstGhostPad:recv_rtp_sink_0.GstProxyPad:proxypad1: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpSession:rtpsession1.GstPad:recv_rtp_src: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpSsrcDemux:rtpssrcdemux1.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpJitterBuffer:rtpjitterbuffer1.GstPad:src: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpJitterBuffer:rtpjitterbuffer1.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0/GstRtpPtDemux:rtpptdemux0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
    
/GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)99
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin0.GstGhostPad:recv_rtp_src_0_4186542290_99.GstProxyPad:proxypad2: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)99
    
/GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1/GstRtpPtDemux:rtpptdemux1.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264
    
/GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay1.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
    
/GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay1.GstPad:sink: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)99
    
/GstPipeline:pipeline0/GstRtpBin:rtpbin1.GstGhostPad:recv_rtp_src_0_4186622237_99.GstProxyPad:proxypad3: caps = application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)99
    
/GstPipeline:pipeline0/ffdec_h264:ffdec_h2641.GstPad:sink: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
    
/GstPipeline:pipeline0/ffdec_h264:ffdec_h2640.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoScale:videoscale0.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter1.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoBox:videobox0.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoBox:videobox0.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter2.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter2.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp1.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp1.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoMixer2:mix.GstVideoMixer2Pad:sink_1: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)176, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/ffdec_h264:ffdec_h2641.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoScale:videoscale1.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoScale:videoscale1.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter3.GstPad:src: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter3.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoBox:videobox1.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoBox:videobox1.GstPad:sink: caps = video/x-raw-yuv, width=(int)176, height=(int)144, framerate=(fraction)15/1, format=(fourcc)I420, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter4.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstCapsFilter:capsfilter4.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp2.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp2.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstVideoMixer2:mix.GstVideoMixer2Pad:sink_2: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)354, height=(int)144, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, interlaced=(boolean)false
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp0.GstPad:src: caps = video/x-raw-yuv, format=(fourcc)YUY2, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1
    
/GstPipeline:pipeline0/GstFFMpegCsp:ffmpegcsp0.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)AYUV, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1
    
/GstPipeline:pipeline0/GstXvImageSink:xvimagesink0.GstPad:sink: caps = video/x-raw-yuv, format=(fourcc)YUY2, width=(int)640, height=(int)360, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1
    
WARNING: from element /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0: A lot of buffers are being dropped.
    
Additional debug info:
    
gstbasesink.c(2875): gst_base_sink_is_too_late (): /GstPipeline:pipeline0/GstXvImageSink:xvimagesink0:
    
There may be a timestamping problem, or this computer is too slow.

    First video stream missing
    The first video stream

    I highly suspect it has something to with videobox.

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