Recherche avancée

Sur d’autres sites (6868)

• Play mp3 data with audiotrack with ffmpeg

  1er février 2014, par Ichigo Kurosaki

  I am designing an android app where i receive live mp3 data as stream from Red5 server and i need to play it.

  I cant play it using media player class as i don't have any url for the stream, nor i cant use files. Another option is to use Audio track class, but requires PCM data only. So need to convert mp3 to pcm, so using ffmpeg.

  My code for conversion is

  AVCodec *codec;
  
  AVCodecContext *c= NULL;
  
  int out_size, len;
  
  uint8_t *outbuf;
  
  
  
  int iplen=(*env)->GetArrayLength(env, mp3buf);
  
  int16_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
  AVPacket avpkt;
  
  av_init_packet(&avpkt);
  
  av_register_all();
  
  avcodec_register_all();
  
  
  
  codec = avcodec_find_decoder(CODEC_ID_MP3);
  
  if(!codec){
  
      __android_log_print(ANDROID_LOG_DEBUG, "logfromjni", "Codec not found");
  
  }
  
  c = avcodec_alloc_context();
  
  outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
  
  avpkt.data = (*env)->GetByteArrayElements(env,mp3buf,NULL);
  
  
  
  avpkt.size = (*env)->GetArrayLength(env, mp3buf);
  
  out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
  
  int ao=avcodec_open(c, codec);
  
      if (ao < 0) {
  
          __android_log_print(ANDROID_LOG_DEBUG, "logfromjni", "avcodec not open");
  
      }
  
      len = avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt);

  The Problem is avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt); returns -1 always.

  Cant figure out whats wrong.

  Any help appreciated.

• Video won't play on iphone

  18 octobre 2016, par Merc

  I have an app that places videos online, and cannot find a way to get iPhones to actually play them.

  ffprobe says :

    merc@mercs-thinkpad:/disk/home/merc/Downloads$ ffprobe 5801005ff1861ba1729757fbffprobe version 2.8.8-0ubuntu0.16.04.1 Copyright (c) 2007-2016 the FFmpeg developers
  
      built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.2) 20160609
  
      configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
      WARNING: library configuration mismatch
  
      avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-version3 --disable-doc --disable-programs --disable-avdevice --disable-avfilter --disable-avformat --disable-avresample --disable-postproc --disable-swscale --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libvo_aacenc --enable-libvo_amrwbenc
  
      libavutil      54. 31.100 / 54. 31.100
  
      libavcodec     56. 60.100 / 56. 60.100
  
      libavformat    56. 40.101 / 56. 40.101
  
      libavdevice    56.  4.100 / 56.  4.100
  
      libavfilter     5. 40.101 /  5. 40.101
  
      libavresample   2.  1.  0 /  2.  1.  0
  
      libswscale      3.  1.101 /  3.  1.101
  
      libswresample   1.  2.101 /  1.  2.101
  
      libpostproc    53.  3.100 / 53.  3.100
  
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '5801005ff1861ba1729757fb':
  
      Metadata:
  
        major_brand     : isom
  
        minor_version   : 512
  
        compatible_brands: isomiso2avc1mp41
  
        encoder         : Lavf57.50.100
  
      Duration: 00:00:12.37, start: 0.021333, bitrate: 993 kb/s
  
        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 928 kb/s, 29.83 fps, 29.83 tbr, 11456 tbn, 59.67 tbc (default)
  
        Metadata:
  
          handler_name    : VideoHandler
  
        Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 70 kb/s (default)
  
        Metadata:
  
          handler_name    : SoundHandler

  The video is here

  The file was created using ffmpeg from within the app.

  Is this a codec problem ? What shall I do to make sure iPhones can actually play them ?

• Play MPEG-2 TS using MseStreamSource

  27 novembre 2022, par Nicolas Séveno

  I need to display a live video stream in a UWP application.

  



  The video stream comes from a GoPro. It is transported by UDP messages. It is a MPEG-2 TS stream. I can play it successfully using FFPlay with the following command line :

  



  ffplay -fflags nobuffer -f:v mpegts udp://:8554


  



  I would like to play it with MediaPlayerElement without using a third party library.

  



  According to the following page :
https://learn.microsoft.com/en-us/windows/uwp/audio-video-camera/supported-codecs
UWP should be able to play it. (I installed the "Microsoft DVD" application in the Windows Store).

  



  I receive the MPEG-2 TS stream with a UdpClient. It works well.
I receive in each UdpReceiveResult a 12 bytes header, followed by 4, 5, 6, or 7 MPEGTS packets (each packet is 188 bytes, beginning with 0x47).

  



  I created a MseStreamSource :

  



  _mseStreamSource = new MseStreamSource();
_mseStreamSource.Opened += (_, __) =>
{
    _mseSourceBuffer = _mseStreamSource.AddSourceBuffer("video/mp2t");
    _mseSourceBuffer.Mode = MseAppendMode.Sequence;
};
_mediaPlayerElement.MediaSource = MediaSource.CreateFromMseStreamSource(_mseStreamSource);


  



  This is how I send the messages to the MseStreamSource :

  



      UdpReceiveResult receiveResult = await _udpClient.ReceiveAsync();
    byte[] bytes = receiveResult.Buffer;
    mseSourceBuffer.AppendBuffer(bytes.AsBuffer());


  



  The MediaPlayerElement displays the message "video not supported or incorrect file name". (not sure of the message, my Windows is in French).

  



  Is it a good idea to use the MseAppendMode.Sequence mode ?
What should I pass to the AppendBuffer method ? The raw udp message including the 12 bytes header or each MPEGTS 188 bytes packet ?