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• Creating an Init file from existing non-fragmented, segmented MP4 files

  20 novembre 2018, par slhck

  I am performing chunked encodes of longer video files, where I’ve split the original file into individual sequences that I have encoded separately. These sequences are files of different length, depending on where the scene cuts appear—they may be between 2 and 5 seconds long. They all start with an I-frame and are standalone.

  My encoded sequences are all MP4s, e.g. :

  test_0000.mp4
  
  test_0001.mp4
  
  test_0002.mp4
  
  test_0003.mp4
  
  test_0004.mp4

  They all have common properties :

  $ mp4info test_0000.mp4
  
  
  
  File:
  
    major brand:      isom
  
    minor version:    200
  
    compatible brand: isom
  
    compatible brand: iso2
  
    compatible brand: mp41
  
    fast start:       no
  
  
  
  Movie:
  
    duration:   2016 ms
  
    time scale: 1000
  
    fragments:  no
  
  
  
  ...

  Now, in order to play those with a DASH player, I have to create an initialization segment and individual fragmented MP4s.

  I could generate the fragmented MP4s via mp4fragment which I run on each standalone MP4 file :

  $ mp4info test_0000.m4s
  
  File:
  
    major brand:      isom
  
    minor version:    200
  
    compatible brand: isom
  
    compatible brand: iso2
  
    compatible brand: mp41
  
    compatible brand: iso5
  
    fast start:       yes
  
  
  
  Movie:
  
    duration:   2016 ms
  
    time scale: 1000
  
    fragments:  yes
  
  
  
  ...

  But obviously, these are now not according to spec, and all contain a moov atom :

  

  What I’d need is individual media segments with only one moof and mdat box, which then require an initialization segment with only a moov box.

  How can I generate that from the existing, already encoded segments ?

  I know this appears like an XY problem. In principle, I could already segment my original file directly after encoding, and run those encodes at the same time, e.g. using ffmpeg’s dash muxer, or MP4Box, however :

  • There is almost no control over the resulting segment sizes, with respect to minimum and maximum duration
  • This approach does not parallelize

  I have also checked Bento4 ; it does not seem to offer this functionality. Neither does FFmpeg. MP4Box behaves similarly. They all assume you have one long file to start with.

  ---

  I see I could splice off the ftyp and moov boxes from these “fake fragments” in order to create an initialization segment. But I would end up with segments containing multiple moof and mdat boxes, which is not according to the specification – it only allows one fragment and media data box :

  4. Media Segments

  […] one optional Segment Type Box (styp) followed by a single Movie Fragment Box (moof) followed by one or more Media Data Boxes (mdat).

  I guess I can live with this the styp not being present.

• Unable to playback hardware encoded H.264 to RED5 server using FFmpeg

  26 février 2019, par Les

  I have a USB camera that is capable of H.264 on-board compression. I use the following FFmpeg command line to grab the encoded H.264 from the camera and put it in a ’flv’ container :

  ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv c:\temp\test.flv 

  This works as expected and I can view the video using VLC no problem. Following this principle I then attempt to stream to a RED5 server using the following command :

  ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp://192.168.75.34/live/livestream 

  The RED5 server detects the stream but I am unable to connect to it and view it using my basic Python program.

  If I do the same thing but use FFmpeg to carry out H.264 encoding of the default capture pin (MJPEG), it will stream correctly.

  I’m not sure if there is some flag in the command line that I might be missing ? Any help with this issue would be much appreciated.

  Here is the log output from the second FFmpeg command :

  C :\ffmpeg-latest-20190219\ffmpeg-static\bin>ffmpeg -y -f dshow -vcodec h264 -i video="USB Camera" -vcodec copy -copyinkf -f flv rtmp ://192.168.75.176/live/livestream"

  ffmpeg version N-93151-gff03418348 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20190212
  configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libmfx —enable-amf —enable-ffnvcodec —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt
  libavutil 56. 26.100 / 56. 26.100
  libavcodec 58. 47.102 / 58. 47.102
  libavformat 58. 26.101 / 58. 26.101
  libavdevice 58. 6.101 / 58. 6.101
  libavfilter 7. 48.100 / 7. 48.100
  libswscale 5. 4.100 / 5. 4.100
  libswresample 3. 4.100 / 3. 4.100
  libpostproc 55. 4.100 / 55. 4.100

  Input #0, dshow, from ’video=USB Camera’ :
  Duration : N/A, start : 1834145.825000, bitrate : N/A
  Stream #0:0 : Video : h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080, 30 fps, 30 tbr, 10000k tbn, 20000k tbc
  

  Output #0, flv, to ’rtmp ://192.168.75.176/live/livestream’ :
  Metadata :
  encoder : Lavf58.26.101
  Stream #0:0 : Video : h264 (Main) ([7][0][0][0] / 0x0007), yuv420p, 1920x1080, q=2-31, 30 fps, 30 tbr, 1k tbn, 10000k tbc

  Stream mapping :
  Stream #0:0 -> #0:0 (copy)
  Press [q] to stop, [?] for help
  frame= 39 fps=3.2 q=-1.0 Lsize= 976kB time=00:00:07.10 bitrate=1124.8kbits/s speed=0.59x
  video:975kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.106110%

• MySql stops running in combination with Laravel Queue, Supervisor, and FFMPEg

  13 juin 2014, par egekhter

  After setting up queue listener to process uploaded videos with FFMPEG, I’ve come back to the server several times to find that MySql has stopped running. I checked drive space and it’s about 77% used (43G out of 60G).

  Here’s my code in case it’s useful :

  public function fire($job, $data)
  
  {
  
  $data = json_decode($data['transcoding_message'], true);
  
  $output_directory = '/home/ubuntu/transcodes/';
  
  $amazon_array = array();
  
  
  
  $s3 = AWS::get('s3');
  
  
  
  
  
      //execute main transcoding thread
  
  
  
      $cmd = 'sudo ffmpeg -i ' . $data['temp_file_url'] . ' -y -vcodec libx264 -tune zerolatency -movflags faststart -crf 20 -profile:v main -level:v 3.1 -acodec libfdk_aac -b:a 256k ' . $output_directory. $data['temp_file_key'] . '_HQ.mp4 -vcodec libx264 -s ' . $sq_width . 'x' . $sq_height . ' -tune zerolatency -movflags faststart -crf 25 -profile:v main -level:v 3.1 -acodec libfdk_aac -b:a 256k ' . $output_directory. $data['temp_file_key'] . '_SQ.mp4 -ss ' . $seek_half . ' -f image2 -vf scale=iw/2:-1 -vframes 1 ' . $output_directory. $data['temp_file_key'] . '_thumb.jpg';
  
  
  
      exec($cmd." 2>&1", $out, $ret);
  
  
  
  
  
      if ($ret)
  
      {
  
  
  
          Log::error($cmd);
  
          echo 'Processing error' . PHP_EOL;
  
          //there was a problem
  
          return;
  
      }
  
  
  
      else
  
      {
  
          //setup file urls
  
      echo 'about to move files';
  
  
  
      $hq_url = $this->bucket_root . $data['user_id'] . '/' . $data['temp_file_key'] . '_HQ.mp4';
  
      $sq_url = $this->bucket_root . $data['user_id'] . '/' . $data['temp_file_key'] . '_SQ.mp4';;
  
      $thumb_url = $this->bucket_root . $data['user_id'] . '/' . $data['temp_file_key'] . '_thumb.jpg';
  
  
  
      $amazon_array['video_hq_url'] = $data['temp_file_key'] . '_HQ.mp4';
  
      $amazon_array['video_sq_url'] = $data['temp_file_key'] . '_SQ.mp4';
  
      $amazon_array['video_thumb_url'] = $data['temp_file_key'] . '_thumb.jpg';
  
  
  
              //copy from temp to permanent
  
  
  
      foreach ($amazon_array as $k => $f)
  
      {
  
          $uploader = UploadBuilder::newInstance()
  
              ->setClient($s3)
  
              ->setSource($output_directory.$f)
  
              ->setBucket($this->bucket)
  
              ->setKey('users/' . $data['user_id'] . '/' . $f)
  
              ->setConcurrency(10)
  
              ->setOption('ACL', 'public-read')
  
              ->build();
  
  
  
          $uploader->getEventDispatcher()->addListener(
  
              'multipart_upload.after_part_upload',
  
              function($event) use ($f) {
  
                  // Do whatever you want
  
              }
  
          );
  
  
  
          try {
  
              $uploader->upload();
  
              echo "{$k} => Upload complete.\n" . PHP_EOL;
  
  
  
              DB::table('items')->where('id', $data['item_id'])->update(array($k => $this->bucket_root. $data['user_id'] . '/' .$f, 'deleted_at' => NULL));
  
              //delete local
  
  
  
              unlink($output_directory.$f);
  
  
  
              unset($uploader);
  
          } catch (MultipartUploadException $e) {
  
              $uploader->abort();
  
              echo "{$k} => Upload failed.\n" . PHP_EOL;
  
              continue;
  
          }
  
      }
  
  
  
          //write to database
  
  
  
              DB::table('archives_items')->where('id', $data['archive_item_id'])->update(array('deleted_at' => NULL));
  
              DB::connection('mysql3')->table('video_processing')->where('id', $data['id'])->update(array('finished_processing' => 1));
  
  
  
          //delete files
  
  
  
          //delete s3
  
          $s3->deleteObject(
  
              array(
  
                  'Bucket' => $this->temp_bucket,
  
                  'Key' => $data['file_name']
  
              )
  
          );
  
          echo $data['temp_file_url'] . '=>' . " deleted from temp bucket.\n" . PHP_EOL;
  
          DB::connection('mysql3')->table('video_processing')->where('id', $data['id'])->update(array('deleted_at' => \Carbon\Carbon::now()));
  
  
  
      }
  
          $job->delete();
  
  
  
          // end of processing uploaded video
  
          }
  
  
  
  
  
      else
  
      {
  
          return;
  
      }

  Any ideas as to why MySql would die like that ?

  ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)

  Edit : I wanted to add that the php artisan queue:listen command is being triggered via Supervisor and that I have 4 running concurrent processes.