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• FFMPEG Compilation and Video Thumbnail Issues [on hold]

  2 janvier 2016, par P. Paul

  I have compiled FFMPEg on a Linux, Centos machine according to the guide in here https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu , and the auto video thumbnail creation command in here https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  The problems are...

  1- When I use ffmpeg or ffmpeg -version command to check if ffmpeg has been installed I get the error message, "Command not found". But when I check for ffmpeg directory "~/ffmpeg_sources" is found and the machine says, "is a directory".

  2- Also, I did a test and upload video to the site to see if the video’s thumbnail will be automatically generated, but it didn’t show any thumbnail.

  Any help would be greatly appreciated.

  Thanks in advance !

• Extract video clip from MP4 of exacting length [closed]

  21 janvier, par Wes

  The tools I've tried so far are only gives me approximations to the start and end times that I specify. They are usually off by a few seconds.

  


  I need a tool to extract video and audio at exact start and stop times, ideally to the millisecond. It would be preferable to do so without any easily noticeable loss in video quality from the original. I would also prefer to keep the audio in the video.

  


• FFMPEG picture in picture

  19 février 2016, par Jalyo

  I try to put a portion of video in a video at a certain time.

  Se here’s my command :

  ./ffmpeg-3.0-32bit-static/ffmpeg \
  
  -y \
  
  -i main.mp4 \
  
  -itsoffset -10 \
  
  -i overlay.mp4 \
  
  -filter_complex \
  
  "[1:a] atrim=5:20 [1:a1]; \
  
  [1:a1] adelay=5000|5000 [1:a2]; \
  
  [0:a][1:a2] amix [outa]; \
  
  [1:v] scale=120:-1 [1:v1]; \
  
  [0:v][1:v1] overlay=x=25:y=25:enable='between(t,5,20)'[outv]" \
  
  -map "[outv]" \
  
  -map "[outa]" \
  
  -c:a aac \
  
  -c:v libx264 \
  
  -vb 1000k \
  
  -r 24 \
  
  -strict -2 \
  
  output.mp4

  But I’ve got "Buffer queue overflow, dropping" messages which, I think, makes my overlay.mp4 a little jerky on the output.mp4 :

  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.
  
      Last message repeated 50 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.0.927x
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 33 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.72x
  
      Last message repeated 14 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=2.97x
  
      Last message repeated 13 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.16x
  
      Last message repeated 35 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.35x
  
      Last message repeated 45 times
  
  [Parsed_overlay_4 @ 0xc29d9c0] [framesync @ 0xc29da84] Buffer queue overflow, dropping.=3.46x
  
      Last message repeated 5 times

  Any idea why ?

  EDIT : Forgot to say I’ve got the last version of ffmpeg => 3.0.