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• Getting log line for each extracted frame from FFMPEG

  3 février 2016, par wpfwannabe

  I am using FFMPEG.exe to extract frames from various videos. As this is a programmatic solution and getting the total frame count and/or duration can prove tricky (with ffprobe), I am thinking I could use the console output to detect individual frames’ timestamps but I am getting a single output line every N frames like this :

  frame=   20 fps=0.0 q=0.0 size=       0kB time=00:00:01.72 bitrate=   0.0kbits/s
  
  frame=   40 fps= 38 q=0.0 size=       0kB time=00:00:04.02 bitrate=   0.0kbits/s
  
  frame=   60 fps= 39 q=0.0 size=       0kB time=00:00:06.14 bitrate=   0.0kbits/s
  
  frame=   70 fps= 38 q=0.0 Lsize=       0kB time=00:00:07.86 bitrate=   0.0kbits/s

  Is there a command line option to force output for each and every frame ? If so, I could extract the time= portion. This is the command line currently used :

  ffmpeg.exe -i video.avi -y -threads 0 -vsync 2 %10d.jpeg

  Ideally, replacing %10d.jpeg with some other format that writes frame’s timestamp but I don’t think this exists.

• Recording application output to video using FFmpeg (or similar)

  15 décembre 2011, par John

  We have a requirement to lets users record a video of our 3D application. I can already grab the individual rendered frames so this question is specifically about how to write frames into a video file.

  I don't think writing each frame as a separate file and post-processing is a workable option.

  I can look at options to record to a simple video file for later optimising/encoding, or writing directly to a sensibly encoded format.

  FFmpeg was suggested in another post but it looks a bit daunting to me. Is it the best option, if not what can be suggested ? We can work with LGPL but not full GPL.

  We're working on Windows (Win32 not MFC) in C++. Sample/pseudo code with your recommended library is very much appreciated... basically after how to do 3 functions :

  • startRecording() does whatever initialization is needed
  • recordFrame() takes pointer to frame data and encodes it, ideally with timing data
  • endRecording() finalizes the video file, shuts down video system, etc

• How would I write a batch file to run an ffmpeg command on an entire directory ? [duplicate]

  26 mai 2019, par invertgrind

  This question already has an answer here :

  • How do you convert an entire directory with ffmpeg ?
    
    15 answers
    

  How would I create a batch file or simply a command to run ffmpeg instructions on an entire directory ? I wish to transmux a folder of .ts files to .mp4

  For individual files I use the command :

  ffmpeg -i file.ts -acodec copy -vcodec copy file.mp4