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• How can I play a video from the CLI with no output of video or audio

  1er janvier 2023, par Gary

  I have 1000s of video files and I know some of them are corrupted. I want to be able to detect corrupted files with a bash script, I tried using FFmpeg with error logging :

  


  ffmpeg -v error -i "vid.avi" -f null - 2>"vid.log"


  


  The output doesn't seem to be very useful though, some files which report errors play without any problems. The only way to know for sure seems to be to watch the video to see if there is any corruption or if it crashes the media player.

  


  I would like to be able to automate the "watching" by playing the video from the command line and detecting the corruption or crashing there but I can't find a way to run it without outputting the video and audio.

  


  I have tried FFplay but I can only disable one of the outputs not both :

  


  ffplay -nodisp "vid.avi"
ffplay -vn "vid.avi"


  


  These disable the video :

  


  ffplay -an "vid.avi"


  


  This disables the audio but I can't combine them, when I do I get an error :

  


  Failed to open file 'vid.avi' or configure filtergraph


  


  I have tried using the vlc/cvlv suggestions I have found but none have worked, it still opens a graphical interface just with no controls.

  


  Is there any way to do this ?

  


• ffmpeg watermarking processing is very slow

  25 février 2014, par Hitesh Rohilla

  I am working on a video processing project and using ffmpeg for watermarking. I achieve exactly what i want but the problem is that the process is very very slow.

  I am using a Intel Smart 2nd gen family Core-i5 Processor with 4GB RAM on a 32 bit operating system Microsoft Windows-8 on a 64-bit CPU.

  I tried watermarking a video [mp4] of length 1:30 Min. size of file is 1.5GB

  Whole process accomplish in 3 Hrs to watermark my video file and what i noticed while process is that ffmpeg was processing 28 frames per sec first and then later it slow down up to 20 frames per second. a normal human watch video with frame rate of 30 frame per second and process was even slower then this that's why it took more time [3 Hrs] then the actual length of video itself [1:33]

  What i think to make process efficient is to use ffmpeg Watermarking Source Code and modify it somewhat...

  I want to ask if someone have achieve fast watermarking before by any other way or have modified this code to achieve faster process in order to save my time...

• pyAudioAnalysis to recognize the beginning of a video

  22 mai 2022, par AlonBR

  I have a video beginning with a 5,4,3,2,1 beeping (similar to : https://youtu.be/67lnjV6SrFw). the sound is recorded alongside ambiant sounds. Using ffmpeg I can easily extract the audio.
I am basically asking two questions :

  


  

  1. Can I use ffmpeg-python's ffmpeg.input('file.mp4').audio as an input to perform pyAudioAnalysis's functions on ?

  


  2. Can pyAudioAnalysis recognize the beeping (i.e. I can input an audio of the beeping and the audio of the video) to find the time in which the beeping ends ?

  


  


  


  edit : I've been thinking of something similar to ORELIA software