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• mp4,m4v vidoes not play on firefox

  20 novembre 2015, par Waqas Ahad

  Using paperclip-ffmpeg for video uploading in Rails.
  It plays on Chrome but not on Firefox and throws :

  Video format or MIME type is not supported

  I have this code in my model :

  has_attached_file :videod, :styles => { 
  
                          medium => { :geometry => "640x480", :format => 'mp4' },
  
                         :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 }
  
  }, :processors => [:ffmpeg]
  
  validates_attachment_size :videod, :less_than => 100.megabytes
  
  validates_attachment_presence :videod
  
  validates_attachment_content_type :videod, :content_type => /\Avideo\/.*\Z/

  I also installed ubuntu-restricted-extras which was required to play it on firefox.

  Result of ffprobe :

  ffprobe version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2007-2014 the FFmpeg developers
  
  built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
  configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --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-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SampleVideo_360x240_2mb.mp4':
  
  Metadata:
  
    major_brand     : isom
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1mp41
  
    creation_time   : 1970-01-01 00:00:00
  
    encoder         : Lavf53.24.2
  
  Duration: 00:00:26.80, start: 0.000000, bitrate: 626 kb/s
  
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 239 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : SoundHandler

  After ffmpeg -i :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SampleVideo_360x240_2mb.mp4':
  
  Metadata:
  
    major_brand     : isom
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1mp41
  
    creation_time   : 1970-01-01 00:00:00
  
    encoder         : Lavf53.24.2
  
  Duration: 00:00:26.80, start: 0.000000, bitrate: 626 kb/s
  
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 239 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : VideoHandler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : SoundHandler

• How to decode audiostream to play with AudioUnits ?

  4 décembre 2015, par sadhi

  I have a PCM ulaw stream that I receive and I want to play this on iOS. To play audio in my app I made an AudioUnit implementation, but since it requires linear PCM I must decode it first. For this I use ffmpeg with the following code :

          AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_PCM_MULAW);
  
  
  
          self.audio_codec_context = avcodec_alloc_context3(codec);
  
          self.audio_codec_context->codec_type = AVMEDIA_TYPE_AUDIO;
  
          self.audio_codec_context->sample_fmt = *codec->sample_fmts;
  
          self.audio_codec_context->sample_rate = 48000;
  
          self.audio_codec_context->channels    = 1;
  
          //open codec
  
          int result = avcodec_open2(self.audio_codec_context, codec,NULL);            
  
  
  
          //this should hold the raw data
  
          AVFrame * audioFrm = av_frame_alloc();
  
  
  
          AVPacket pkt;
  
          av_init_packet(&pkt);
  
          pkt.data = (unsigned char*)buf;
  
          pkt.size = ret;
  
          pkt.flags = AV_PKT_FLAG_KEY;
  
  
  
          int got_packet;
  
          result = avcodec_decode_audio4(self.audio_codec_context, audioFrm, &got_packet, &pkt);
  
  
  
          AVPacket encodedPkt;
  
          av_init_packet(&encodedPkt);
  
          encodedPkt.size = 0;
  
          encodedPkt.data = NULL;
  
  
  
          if (audioFrm != NULL) {
  
              self.audio_codec_context = NULL;
  
              AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_PCM_S16LE);
  
  
  
              self.audio_codec_context = avcodec_alloc_context3(codec);
  
              self.audio_codec_context->codec_type = AVMEDIA_TYPE_AUDIO;
  
              self.audio_codec_context->sample_fmt = *codec->sample_fmts;
  
              self.audio_codec_context->bit_rate = 64000;
  
              self.audio_codec_context->sample_rate = 48000;
  
              self.audio_codec_context->channels    = 1;
  
  
  
  
  
              int result = avcodec_open2(self.audio_codec_context, codec,NULL);
  
              if (result < 0) {
  
                  NSLog(@"avcodec_open2 returned %i", result);
  
              }
  
  
  
  
  
              result = avcodec_encode_audio2(self.audio_codec_context, &encodedPkt, audioFrm, &got_packet);
  
  
  
              if (result < 0) {
  
                  NSLog(@"avcodec_encode_audio2 returned %s", av_err2str (result));
  
                  continue;
  
              }
  
          }

  For some reason no matter what I do the audio that comes out at the end is all noise.
  So my question is : How should I decode my audiostrean to play it with AudioUnits ?

• Is it possible to play an output video file from an encoder as it's being encoded ?

  16 août 2022, par jAckOdE

  I have a video file, and I need to encode it as H264/AVC and feed to client via HTTP. What i need is that i player at client side can play back the video as it is being encoded.

  



  AFAIK, To enable player to play as the video is downloading, "moov atom" have to be placed at the begnning of the video file. However, encoders (ex : ffmpeg) always write "moov atom" at the end of file after it completes encoding.

  



  Is there any way encoder can put "moov atom" at beginning of encode's output ? Or play video without moov atom presence ?

  



  Thank in advances

  



  LR