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• Quickly check the integrity of video files inside a directory with ffmpeg

  4 février 2017, par DMT

  I’m desperately searching for a convenient method to check the integrity of .mp4 files inside a specific directory with folders in it. Both the names of the .mp4 files and the folders contain spaces, special characters and numbers.

  I’ve already found a proper ffmpeg command to quickly identify a damaged .mp4 file, taken from here :
  ffmpeg -v error -i filename.mp4 -map 0:1 -f null - 2>error.log

  If the created error.log contains some entries, then the file is obviously corrupted. The opposite would be an empty error.log.

  The next step would be to apply this command to every .mp4 file within the folder and its subfolders. Some guides, like here and here, do describe how to apply a ffmpeg command recursively, but my coding skills are limited, so therefore I can’t find a way to combine these commands to get the following :

  A way to test all .mp4 files inside a folder (recursively) with the aforementioned ffmpeg command, that should create .log files, only if a video file does contain errors (read has some content) and it should inherit the name of the broken file, to know which file is corrupted.

  Using Ubuntu Gnome 15.10.

• ffmpeg record screen file formats

  3 avril 2020, par New_Dev

  Good day,
I'm currently writing a bash script which records the screen under certain conditions. The problem is that only avi works as a file extension for recording the screen. This script is going to be used on an Raspberry Pi and currently I get on a decent virtual machine only 10-20 fps (goal would be around 30 fps). I think .avi is not suited for my project. But .mpeg and .mp4 are not working for recording. I tried recording with .avi and then converting it in .mp4, but I have limited memory and .avi ist just too big in size. I use currently the following command :

  



  ffmpeg -f x11grab -y -r 30 -s 960x750 -i :0.0+0,100 -vcodec huffyuv ./Videos/out_$now.avi
//$now is the current date and time


  



  So I wanted to know if I need some special packages from ffmpeg to record with for example .mp4 or if there are other file formats available for ffmpeg screen recording.

  



  Edit :
I found that the codec libx264 for mp4 works, but the fps drop until they hit5 fps, which is definetly too low. The recorded video appeared like being a fast forward version of the recorded screen.

  



  With mpeg4 for mpeg I reached over 30 fps, but the video qualitywas very bad.

  



  It appears that even my big avi-files look like being played fast forward. Is there something I do wrong ?

  



  Is there a good middle way, where I get a decend video quality, good fps (20+) and a file which isn't too big ?

  



  Edit 2 :
I tried recording it with .avi and converting it afterwards. Just converting with ffmpeg -i test.avi -c:a aac -b:a 128k -c:v libx264 -crf 23 output.mp4 
resulted in the same framedrops as if I was recording with .mp4. But when I cut a littlebit of the beginning of the video and named the outputfile .mp4, the size became much smaller. But when I started the cutting at 0:00:00 (so tried just converting), it just changed the file format without converting it (so the size stayed the same). Any ideas ?

  


• Correct two more corner case problems with #1486 :

  24 juin 2014, par Monty

  Correct two more corner case problems with #1486 :
  1) single-page streams will have no bisection ; handle the special case explicitly
  2) if the bisection fails without ever successfully grabbing a page, the first-page-special-case check is unprotected and will look at uninitialized memory.
  git-svn-id : http://svn.xiph.org/trunk/vorbis@19171 0101bb08-14d6-0310-b084-bc0e0c8e3800
  

  • [DH] lib/vorbisfile.c