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• How to remove PES header from video stream

  24 septembre 2019, par AnkurTank

  I have captured video stream from the multimedia device which has H264 format.

  I want to remove PES header (i.e. first 14 bytes of the frame). Is it possible to do it by ffmpeg or any other tool. I tried searching online but didn’t find it. I thought of scripting it out and remove it but don’t know frame format completely. I know, I have to learn all format stuffs and I am going through it but I need this immediately. Any suggestion/pointers ?

• Using ffmpeg to convert an SEC file

  29 septembre 2023, par anna

  I need to convert an SEC file into any video format that I can share and/or upload to Youtube. MP4, etc.

  



  I'm a complete newbie at all things terminal. I've tried :

  



  ffmpeg -i video.sec video.mp4

  



  ffmpeg -i video.sec -bsf:v h264_mp4toannexb -c:v copy video.avi

  



  ffmpeg -i video.sec -b 256k -vcodec h264 -acodec aac video.mp4

  



  I don't understand what any of these mean, they're just examples I found online. However, whatever I try returns this error :

  



  Invalid data found when processing input

  



  Any thoughts ? Thanks !

  


• Why after rendering with ffmpeg, file size did not decrease ?

  15 avril 2021, par ptrra

  PROBLEM : After rendering a certain video with ffmpeg file size increased from 4GB to 6GB.
  
ORIGINAL VIDEO : EE1.mkv
  
FFMPEG COMMAND : ffmpeg -i EE1.mkv -c:a copy -c:v libx264 -crf 23 -preset medium -profile:v high out.mp4
  
QUESTIONS : Why did the file size increase ? What am I doing wrong ?

  


   !DETAILS !
  
After a few years I made about 30 gaming videos (130GB) and with the current covid-19 situation I started recording my online classes (about 40 videos or 150GB). Now because I'm lacking space on my 1TB external HDD I started getting into ffmpeg. Before I was only using obs-studio and not good parameters for recording.

  


  I was using CBR mode for recording, either 5000KB or 15000KB bit rate with varying x264 presets and profiles because I was also experimenting with them. Usually superfast preset with high profile. So I wanted to convert all those videos with ffmpeg using CRF 23, medium preset and high profile. A note that when I'm recording with obs-studio it's set to record in matroska format (.mkv).

  


  When I was rendering my online classes videos with these settings I managed to achieve 10x better compression with the same quality. And when rendering my gaming videos I managed to achieve up to 3x better compression with the same quality. However there is this one video that when rendered with the same parameters the file size increases.

  


  The EE1.mkv should be recorded with CBR 15000KB bit rate, with superfast preset and high profile. Also the game that is recorded in this video is Empire Earth which needs around 8000KB for it to look good. Everything more than 8000KB is not needed.

  


  Thank you all for your help.