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• Node.js FFMPEG Reporting Progress Architecture

  11 septembre 2018, par munkee

  I’m running a node.js HTTP server which has a video conversion API built using ffmpeg. I am wondering how best to report on the progress of the file conversion to a separate front end. The HTTP server is going to be standalone as its own service, so I would like to be able to render the percentage complete of the conversion to another server with a simple front end. Upon completion of the conversion the file is downloaded automatically.

  My current end point /convert takes a file URL with a .mov extension, downloads the file and runs it through the conversion process to only output Audio. Using response headers I force the browser to download the file once the conversion has ended, I also delete the temporary file once download has completed.

  A full request would look like

  https://www.someurl.com/convert?file=https://www.filetodownload.com/Skating.mov

  I am using the fluent-ffmpeg npm package : https://github.com/fluent-ffmpeg/node-fluent-ffmpeg which serves a "progress" event :

  ffmpeg('/path/to/file.avi')
  
    .on('progress', function(progress) {
  
      console.log('Processing: ' + progress.percent + '% done');
  
    });

  I am thinking of emitting the progress.percent information on to a separate endpoint maybe along the lines of :

  https://www.someurl.com/progress

  Which will simply be my http server sending the percentage back to the browser. I feel as though I am going about the architecture incorrectly and there must be a better way of architecting the final outcome.

• FFMPEG : Concatenating mixed format inputs - copy if possible, transcode if not ?

  8 juin 2017, par roberb04

  My input files are in a mixture of formats - predominantly DNxHD and AVC-I MXF.

  I need to normalize these to AVC-I and I will often need to concatenate sections from non-AVC-I files with sections from AVC-I content in the process.

  I have achieved this goal already but it appears to me that whereas the sections whose source is already in AVC-I format could simply be copied through to the output file (and not decoded/retranscoded leading to potential picture quality degradation), they are in fact transcoded. I could be wrong about that.

  Is it possible for FFMPEG to "pass-through" frames from AVC-I inputs whilst transcoding frames from DNxHD inputs when concatenating both into a single AVC-I output file ? If so, how can I achieve that please ?

  Many thanks !

• ffmpeg raspberry raspbian rapivid streaming

  18 juin 2017, par Nix042

  I am now playing with raspivid on Raspbian and a raspberry pi equipped with a PinoIR camera module.

  I am almost done with the setup and have found a pre-compiled version of FFmpeg 3.1.1 to experiment a streaming to a youtube live stream by means of the command :

      raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<session>
  
  </session>

  Is there any parameter I can use to also stream to a local machine (e.g. through a VLC client reading the stream) ?

  I have achieved to do it in another bash with cvlc :

      cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}':demux=h264

  but executing both bashes at the same time is not possible as the input camera is locked by the system.

  So, I looked in the ffmpeg documentation and found an interesting thread on multiple outputs : https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs.
  Then, I have tried the piped processes and another ffmpeg call to the inital command :

  raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<session> | ffmpeg -f h264 -i - -vcodec copy -f rtsp -rtsp_transport tcp rtsp://localhost:8888/live.sdp
  
  </session>

  It appears to have a syntax error, and maybe it is not the best way of achieving this. Could you please put me on the right track ?

  Thanks and have a nice night !

  Nicolas