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• Continously running a PHP script waiting for videos to trancode

  12 mai 2017, par Ian

  I’m making a transcoding server which uses FFMPEG to convert videos to flv. After user uploads a video it’s queued for processing in amazon Simple Queue Service. System is linux ubuntu.

  Instead of running CRON each 1min I wonder if it would be possible to continously run several PHP scripts (dowload queued files, process downloaded etc). Each of them would have its own queue which would be read every 10s or so looking for new tasks.

  My question is :

  How to detect if the script is already running ? I’d run CRON each 1min and if one of the programs would not be running I’d load it again. How stuff like that is done on linux ? PID files ?

  thanks for help,
  ian

• Why does fluent-ffmpeg only work when it throws the error Output stream closed

  29 mars 2024, par volume one

  I am using fluent-ffmpeg to process a video file (and then upload that to Amazon S3). The code is very straightforward but it only works if :

  


  

  • pipe option {end: true} is set in .output()

  


  • which has a side-effect that causes the following console log output

  


  


  


  Processing : 19.261847354642416% done Processing :
32.365144874807335% done Processing : 48.80978326261429% done Processing : 78.35771917058617%
Processing : 91.49377493455148% done Processing :
99.91264359125745% done An error occurred : Output stream closed

  


  


  Despite that error, it seems the file is generated correctly and it gets uploaded to Amazon S3 fine.

  


  This is the fluent-ffmpeg code :

  


  import {PassThrough} from 'node:stream';
import FFMpeg from 'fluent-ffmpeg';

let PassThroughStream = new PassThrough();

             FFMpeg('/testvideo.mp4')
                    .videoCodec('libx264')
                    .audioCodec('libmp3lame')
                    .size(`640x480`)
                    // Stream output requires manually specifying output formats
                    .format('mp4')
                    .outputOptions('-movflags dash')
                    .on('progress', function (progress) {
                        console.log('Processing: ' + progress.percent + '% done');
                    })
                    .on('error', function (err) {
                        console.log('An error occurred: ' + err.message);
                    })
                    .on('end', function () {
                        console.log('FFMpeg Processing finished!');
                    })
                    .output(PassThroughStream, {end: true})
                    .run();

   // Now upload to S3
    try {
          await s3Upload({
              AWSS3Client: 'mys3client',
              Bucket: 'publicbucket,
              ACL: "public-read",
              ContentType: 'video/mp4',
              Key: 'whoever/whatever.mp4',
              Body: PassThroughStream
           });
    } catch (error) {
                    console.log(`s3Upload error`, error)
                }


  


  If I set the pipe output() option to {end: false} then there is no error from fluent-ffmpeg and I get "Processing: 100% done FFMpeg Processing finished!" as the final console log.

  


  BUT the problem is that the s3Upload() does not do anything. There are no errors. Just no activity.

  


  I feel very uncomfortable letting fluent-ffmpeg end in an error even if the code itself does the job intended. It will also cause testing to fail. What could be the issue ?

  


  The command line code is : ffmpeg -i https:/xxxbucket.s3.amazonaws.com/14555/file-example.mp4 -acodec libmp3lame -vcodec libx264 -filter:v scale=w=trunc(oh*a/2)*2:h=480 -f mp4 -movflags dash pipe:1

  


• HLS encoded video (ffmpeg) breaks in Safari when segmented via byte-range

  15 juin 2019, par eschie

  Some of my HLS encoded videos via ffmpeg drop the audio when seeking past the buffer. The only way to sync the audio and video up again is to restart the video. What would be causing this ?

  Example Profile :

  bitrate: 4800, profile: 'high', level: '4.1', resolution: 1080, framerate: '24000/1001'

  ffmpeg
  
      '-y' 
  
      '-i' input_file.mov                                                 
  
      '-v' error 
  
      '-map' '0:0'                                                        
  
      '-c:v' libx264                                                  
  
      '-x264opts' f'
  
          keyint=23:                  
  
          min-keyint=23:          
  
          no-scenecut                                                     
  
      '
  
      '-vf' f'scale=-1:1080'
  
      '-preset' 'slow'
  
      '-profile:v' 'high'
  
      '-level' '4.1'
  
      '-b:v' '4800k'
  
      '-maxrate' '4800k'
  
      '-movflags' 'faststart'
  
      '-bufsize' '9600k' 
  
      '-write_tmcd', '0'
  
      '-r' '24000/1001'                                   
  
      output_dir                                                      

  Segmentation CMD :

  FFMPEG 
  
      '-i' output_dir 
  
      '-v' 'error' 
  
      '-acodec' 'copy'
  
      '-vcodec' 'copy'
  
      '-hls_time' '4' #seconds
  
      '-hls_list_size' '0'
  
      '-hls_flags' 'single_file' 
  
      os.path.join(output_dir, f'{run_id}_{bitrate}.m3u8'

  Added : apple’s mediastreamvalidator outputs a few different errors :

  Error: Playlist vs segment duration mismatch
  
  --> Detail:  Segment duration 98.0146, Playlist duration: 4.7968
  
  --> Source:  1559962503399_2200k.m3u8 - 1559962503399_2200k.ts:1746520@0

  Error: Measured peak bitrate compared to master playlist declared value exceeds error tolerance
  
  --> Detail:  Measured: 3182.61 kb/s, Master playlist: 2173.82 kb/s, Error: 46.41%, Combined rendition name: English
  
  --> Source:  ...playlist.m3u8
  
  --> Compare: 1559962503399_2200k.m3u8

  Error: Different target durations detected
  
  --> Detail:  Target duration: 5 vs Target duration: 4
  
  --> Source:  1559962503399_64k.m3u8
  
  --> Compare: 1559962503399_128k.m3u8

  UPDATE 1 :
  I modified the encoding command to utilize tee pseudo-muxer, but it seems the same issue still exists when segmenting HLS as byte-ranges rather than in separate .ts files :

  $ ffmpeg
  
  -hide_banner
  
  -report
  
  -benchmark
  
  -vstats
  
  -i "../Jane_shallowing_Top_v08.mp4"
  
  -dn
  
  -sn
  
  -filter_complex "[0:v]fps=fps=24.000,setpts=(PTS-STARTPTS),split=[vsplit1][vsplit2];[vsplit1]scale=-1:144[video_144];[vsplit2]scale=-1:1080[video_1080]"
  
  -map "[video_144]"
  
  -r:v:0 "24.000"
  
  -c:v:0 "libx264"
  
  -x264-params "keyint=144:min-keyint=144:scenecut=0:open_gop=0"
  
  -preset:v:0 "slow"
  
  -profile:v:0 "baseline"
  
  -refs:v:0 "2"
  
  -b-pyramid:v:0 "strict"
  
  -tune:v:0 "film"
  
  -b:v:0 "96000"
  
  -maxrate:v:0 "56000"
  
  -bufsize:v:0 "6*56000/8"
  
  -vsync:v:0 "cfr"
  
  -bsf:v:0 "h264_metadata=fixed_frame_rate_flag=1"
  
  -map "[video_1080]"
  
  -r:v:1 "24.000"
  
  -c:v:1 "libx264"
  
  -x264-params "keyint=144:min-keyint=144:scenecut=0:open_gop=0"
  
  -preset:v:1 "slow"
  
  -profile:v:1 "high"
  
  -refs:v:1 "2"
  
  -b-pyramid:v:1 "strict"
  
  -tune:v:1 "film"
  
  -b:v:1 "4800000"
  
  -maxrate:v:1 "4800000"
  
  -bufsize:v:1 "6*4800000/8"
  
  -vsync:v:1 "cfr"
  
  -bsf:v:1 "h264_metadata=fixed_frame_rate_flag=1"
  
  -map a:0 -map a:0
  
  -c:a "libfdk_aac"
  
  -ar "48000"
  
  -ab "128k"
  
  -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0"
  
  -f "hls"
  
  -var_stream_map "v:1,a:0 v:0,a:1"
  
  -hls_time "6.000"
  
  -hls_segment_type "mpegts"
  
  -hls_flags "discont_start+temp_file+single_file"
  
  -hls_list_size "0"
  
  -master_pl_name "playlist.m3u8"
  
  -hls_segment_filename "out_%v.ts" "out_%v.m3u8" 

  Segment duration 98.0267, Playlist duration: 6.0000