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• [Help]Delay in live streaming ?

  14 septembre 2017, par user8583508

  I do not understand how they can make this video ?
  enter link description here
  Real time decreases over time, not directly ?

• How to seal subtitle on the video permanently ? ffmpeg

  10 octobre 2017, par Robert Choy

  I am able to add subtitle to my mp4 ; however, when i upload it on youtube, the subtitle is gone, disappeared.

  So i am asking if there is any method to make the subtitle on the video (forever, permanently, seal it, burn it, force everyone watch the video with subtitle, can’t even turn it off manually)

  ffmpeg -i video.mp4 -i subtitle.srt -c copy -c:s mov_text -disposition:s:0 forced \
  
  permanently-subtitle-video-please.mp4

  i dont like the design of youtube subtitle, so i would love to upload my video + subtitle as one thing.

  sorry i a not an English native speaker, hope you understand what i am trying to ask. thanks

• bash script fail when a command wait ffmpeg to finish

  5 novembre 2013, par d4r10

  In ubuntu 13.04 have a node.js server that launch for certain events, a script like this :

  #! /bin/bash
  
  ...
  
  ...
  
  
  
  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm"
  
  
  
  y_uid=$(/app/youtube-uploader "$folder/$dif.webm" "$label" "$desc" | grep 'watch' | sed 's/v=/ /g' | awk '{print$2}')
  
  
  
  echo "$y_uid" >> ~/log/yt.log
  
  ...
  
  ...

  if avconv (ffmpeg) process a small file (less then 30 minutes of encoding), the script works fine, but if avconv runs for hours, the next command "...youtube-uploader..." (that is a python based application) doesn't work (but if i try to launch it manually, it will go fine).

  I have also tried to launch the next command inside a loop that check if the variable "$y_uid" is empty, so it will try to repeat youtube-uploader until it find a right value, but it will continue to stay in background and will try forever.. (and it is strange, because if i try to launch the command manually, it works fine..).

  Summarizing, seems like that if avconv run for hours, the avconv process will generate a file that is not recognised or locked or a ghost file for the same script (but is recognised if the command is launched outside the script), if it is a small encoding, it will work fine.

  Unfortunatelly It is difficult to debug or test, because i have every time to wait for hours, please help !

  UPDATE

  I think the problem is related at the buffer size of node.js OR some other buffer that store the standard output of ffmpeg. Just correct

  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm"

  in

  avconv -i "$dir$video" -ss "$ss.000" -t $tt -threads 0 "$folder/$dif.webm" &> /dev/null

  so all the ffmpeg output not full the buffer memory and everythings go well