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• Video Feedback Loop with ffmpeg

  4 mai 2020, par driangle

  I am trying to create a digital video feedback loop between two computers.

  



  What I mean by this is the following :

  



  

  



  I attempted several combinations of protocols and video formats and I found out this is the closest I can get. The original video was an "mov" but I had to convert it to .ts in order to get this far, had other issues when using mov or mp4.

  



  I ran the commands in this order to make sure tcp listeners were up before the clients.

  



  On Local Computer

  



  # Command 1: Temporary attempt to capture output of loop
ffmpeg -i 'udp://0.0.0.0:6002?listen&overrun_nonfatal=1' -c copy out.ts


  



  # Command 2: Receives stream from remote host and forwards back to beginning of loop
ffmpeg -i tcp://0.0.0.0:6001?listen -f mpegts udp://localhost:6002


  



  On Remote Computer

  



  #  Command 3: Receives stream from local host and returns stream to another ffmpeg instance
ffmpeg -i tcp://0.0.0.0:6000?listen -f mpegts tcp://:6001


  



  On Local Computer

  



  # Command 4: Sends stream to remote host
ffmpeg -re -i in.ts  -f mpegts tcp://:6000


  



  The steps above don't quite complete the feedback loop, but they do result in a successful video out.ts

  



  Then I tried to modify Command 4 so that it could merge both a file and a udp stream, this is a naive attempt I know, I am not very good with ffmpeg.

  



   ffmpeg \
    -re -i in.ts -i udp://0.0.0.0:6002 \
    -filter_complex " \
        [0:v]setpts=PTS-STARTPTS, scale=540x960[top]; \
        [1:v]setpts=PTS-STARTPTS, scale=540x960, \
             format=yuva420p,colorchannelmixer=aa=0.5[bottom]; \
        [top][bottom]overlay=shortest=1" \
    -f mpegts tcp://:6000


  



  The result was that the command hung waiting for a data on the udp port, which makes sense in hindsight.

  



  I would like to know :

  



  

  • Can this be done at all ? If so, what do I need to change ?

  


  • Do I need to abandon ffmpeg for this task and look into something else ?

  


  



  If you're asking why would I do this, the answer is there is no good reason other than I am curious to know if it's possible and what results it would yield.

  


• laravel ffmpeg upload video in amazon s3 failed 504 gateway Time-out

  21 mai 2020, par Ahmed Al-Rayan

  Why after uploading a video size of more than 1 Giga, I see a problem in the nginx 504 gateway timeout preventing me from completing the processing process. The meaning of the video after uploading starts the processing process and because of this problem it does not go to processing use laravel ffmpeg and use amazon s3 service to store the videos on it and the entire site uploaded to Digital hosting

  


• ffmpeg concat demuxer freezes my video frames while joining the videos

  4 juillet 2019, par Nane

  I am trying to concat 6 WebM video file same resolution and same codecs using this command ffmpeg -f concat -i mylist.txt -c copy finalvideo.webm but the resulted video freezes some part ,exactly where the each part concatenated
  and yes I am using the latest ffmpeg

  resulted video audio spectrum you easily see the video audio freezes

  https://i.stack.imgur.com/SX6WT.gif

  mylist.txt

  file '1.webm'
  
  file '2.webm'
  
  file '3.webm'
  
  file '4.webm'
  
  file '5.webm'
  
  file '6.webm'

  My log

  https://pastebin.com/Rzqr6w3b