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• FFmpeg script for linux and windows batch video encode different settings depending on video resolution [closed]

  28 décembre 2022, par Jaroslav Havel

  I'm looking for advice, help. I would like to convert all home videos to H265 using ffmpeg. Videos are in different formats and resolutions (3GP, mov, avi, mpg, mp4). I have an idea of which setting to set for which resolution, but I don't know how to write it all into a script (windows and linux). For these resolutions

  


  CRF 18-22 for <= 576p use 20
CRF 19-23 for > 576 and <= 720p use 21
CRF 20-24 for >720 and <= 1080p use 22
CRF 22-28 for >= 2160p 4K use 25


  


  For windows i have

  


  @ECHO OFF

FOR %%F IN ("*.*") DO (
     ffmpeg -i %%F -c:v libx265 -crf 20 -preset faster -profile:v main -pix_fmt yuv420p -acodec libmp3lame -b:a 192k %%~nF_new.mkv
)


  


  Big thanks for the help

  


• Can't call FFMPEG from CMD after installing chocolatey+ffmpeg on windows docker container

  19 novembre 2022, par Adil Abdul Rahman

  I have a C# code that is dependent on FFMPEG via CMD/powershell. I am trying to run CLI ffmpeg via a C# code in a windows container with sdk:6.0-windowsservercore-ltsc2022. I found this guide(use 12ft.io to bypass paywall) that says to install chocolatey and then install ffmpeg through that like so :

  


  USER ContainerAdministrator
EXPOSE 3389/tcp


RUN powershell.exe \
  Set-ExecutionPolicy Bypass -Scope Process -Force; \
  iwr -Uri 'https://community.chocolatey.org/install.ps1' -UseBasicParsing -OutFile $home/choco_install.ps1; \
  powershell $home/choco_install.ps1; \
  del $home/choco_install.ps1; \
  choco; \
  exit 0;
  
RUN powershell.exe \
  powershell choco install chocolatey-compatibility.extension -y --force; \
  powershell choco install chocolatey-core.extension -y --force; \
  powershell choco install ffmpeg-full -y --force; \
  ffmpeg; \
  exit 0;


  


  ( I am using this guide for C# dockerfile )

  


  And my C# Code :

  


  string command = $"/C ffmpeg -i \"{VideoUri}\" -vn -ac 1 {outputName}.mp3";
Process.Start("cmd.exe", command).WaitForExit();


  


  But I am running into some trouble. My C# code throws this error :

  


  'ffmpeg' is not recognized as an internal or external command, operable program or batch file.

  


  I have tried calling FFMPEG from the dockerfile to test if it has installed but it just returns this :

  


  Step 5/17 : RUN powershell.exe   powershell choco install chocolatey-compatibility.extension -y --force;   powershell choco install chocolatey-core.extension -y --force;   powershell choco install ffmpeg-full -y --force;   ffmpeg;   exit 0;
 ---> Using cache
 ---> 83b2941d03e6


  


• Why does my linux ffmpeg output file require running it back through ffmpeg to play on windows

  13 septembre 2020, par Sean Miller

  I am using the following to screen capture a Raspberry Pi display :

  


  /usr/bin/ffmpeg -v quiet -f lavfi -i anullsrc -f x11grab -framerate 30 -video_size 720x480 -i :0.0 -f flv -b:v 1M /home/pi/usbdrv/myfile.avi"


  


  I stop screen capturing by hitting the letter q and ffmpeg exits without error.

  


  I can play it back with mplayer in Linux.

  


  However, when I try to play it back on Windows with the old media player or its newer movie player, they reports it is corrupted. I tried mp4 and mkv fromats as well.

  


  If I run it back through ffmpeg to encode it to a new file, it will play.

  


  Any thoughts why Windows will not play it without running it back through ffmpeg again ?

  


  Thanks,
Sean