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• How to not include the Pause duration in the FFMPEG recording timeline

  8 janvier 2019, par Riccardo Volpe

  I’m trying to pause a screencast made with ffmpeg under Linux, giving the command :

  kill -s SIGSTOP <pid>
  
  </pid>

  resuming then it with the command :

  kill -s SIGCONT <pid>
  
  </pid>

  to finally interrupt it with the command :

  kill <pid>
  
  </pid>

  but the resulting file keeps the duration of the pause command in the timeline. Is there any way to not include it in the final video output ?

  Thank you

  Edit #1

  I can’t understand a down vote without an explanation... but maybe my mind thinks different.

  To not be misunderstood and for a better explanation of the problem, I realized a video : as you can see, now, there are 14 seconds in which the timeline is locked (from 29th to 43th second), the same duration of the command to pause the screencast (kill -s SIGSTOP <pid></pid>). Now the previous question, if someone knows the solution.

  The unique one that I thought is to cut the final output, "labeling" the pause command in such a way to know where to cut...

• ffmpeg : Invalid data found when processing input

  20 septembre 2018, par Rich_F

  I have a situation where ffmpeg is throwing an error :

  Invalid data found when processing input

  I’ve reviewed other answers here, but my situation is different. I generate in Ruby, a text file with a list of input files I want to concatenate together into one large video.

  I generate in Ruby, the command meant for bash, which is also output for me to manually copy :

  ffmpeg -y -f concat -safe 0 -i /Volumes/Dragon2/Yums/randoms.txt /Volumes/Dragon2/Yums/final.mp4

  Throws an error :

  /Volumes/Dragon2/Yums/randoms.txt: Invalid data found when processing input

  Here is that file :

  file '/Volumes/Dragon2/Yums/0CEDC3CA-4571-4271-9938-A161EC2A887B.mov'
  
  file '/Volumes/Dragon2/Yums/0D25D907-D053-443B-AFC6-9F12B1711BBF.mov'
  
  file '/Volumes/Dragon2/Yums/6A272808-7706-435D-801E-ACE6B42EC749.mov'
  
  file '/Volumes/Dragon2/Yums/6E9BA2F1-C5E7-4C1C-B290-D116105732FA.mov'
  
  file '/Volumes/Dragon2/Yums/0A41C7B7-74CE-484E-B029-3AE57B8BB4EA.mov'

  When bash runs it, it complains about the input file randoms.txt having invalid data. When I copy and paste the very same command in bash, it works fine. I’m stumped as to how the two are different and why ffmpeg is not happy when initiated in the shell.

  How can I get this to work ? What am I missing ? Cheers

  EDIT : Original ruby code :

  `clear`
  
  require 'pathname'
  
  require 'pp'
  
  
  
  s = '/Volumes/Dragon2/Yums'
  
  files = []
  
  
  
  Dir.foreach(s) do |path|
  
    files << "#{ s }/#{ path }"  
  
  end
  
  
  
  result = files.sample(files.size)           # randomizer
  
  
  
  f = File.open("#{ s }/randoms.txt", 'w+')
  
  result.each_with_index do |item, i|
  
    pp "#{ i }: #{ item }" if item.include?('mov')
  
    f << "file '#{ item }'\n" if item.include?('mov')
  
  end
  
  
  
  `echo `
  
  
  
  File.delete("#{ s }/final.mp4") if File.exists?("#{ s }/final.mp4")
  
  s = "ffmpeg -y -f concat -safe 0 -i #{ s }/randoms.txt #{ s }/final.mp4"
  
  puts s
  
  
  
  sleep 3
  
  `#{ s }`

  I have also tried system s as well with the same error. The syntax is generated fine, output fine, operates fine manually.

• ffmpeg UDP stream incomplete using WEBM (VP9)

  21 janvier 2018, par DerLars

  I’m trying to encode a raw (YUV) video into VP9 and to stream it with ffmpeg via UDP.

  Sender command :

  ffmpeg -f rawvideo -pix_fmt yuv420p -s:v 352x288 -r 25 -i ReferenceVideo_200Frames.yuv -c:v libvpx-vp9 -lossless 1 -f webm udp ://localhost:1337

  Receiver command : (started first)

  ffmpeg -i udp ://localhost:1337 -vcodec copy ReferenceVideo_200Frames_Streamed.webm

  The testvideo used for this has exactly 200 Frames.

  The final output of the sender is :
  frame= 200 fps= 14 q=0.0 Lsize= 7918kB time=00:00:07.96 bitrate=8147.3kbits/s speed=0.574x
  video:7912kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.064364%

  But as soon as the sender finishes, the receiver gets stuck at : frame= 181 fps= 13 q=-1.0 size= 5226kB time=00:00:07.20 bitrate=5945.5kbits/s speed=0.531x

  The final streamed video is now incomplete.

  So my question is : What am I doing wrong that the stream is incomplete ? Did anyone face this issue too and was able to fix it ?

  Many thanks in advance.