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• ffmpeg reduce video size with least quality loss

  13 janvier 2017, par MattJ

  I am trying to reduce video size(as Mb) for storage saving since i will store them online. Could someone help me with the recommended parameters because as much as I have tried the video quality gets a big hit (clear squares). Current parameters size (480x ?) the length is variable, using mpeg4 videoCodec, 30 Fps and libmp3lame audio codec and then add native.
  Original :
  

  What I get :

  

  Ps. I am using node.js and fluent-ffmpeg, but that should not matter much. Uses local ffmpeg.

• Batch file to Drag and Drop files to convert via FFMPEG

  17 août 2022, par james_castrello

  this is probably my first time ever posting on stack overflow.

  


  I have successfully installed and tested ffmpeg.

  


  Now I want to create a batch file where I can drag and drop my .mp4 or .mkv files to convert to .mp3.

  


  I have no experience with ffmpeg or what parameters to use (the test was a copy/paste with the correct file names filled in) and I haven't touched batch scripting in a long time.

  


  Here is the batch script I found online that kind of works but gives me issues.

  


  @echo off
Pushd "Filepath"
for %%a in (*) do (
  ffmpeg -i "%%~fa" "%%~na.mp3"
)
pause;


  


  Batch file is stored on usb drive, along with the shortcut to it (also stored in same folder). The reason for the shortcut is to be able to run the batch as admin once a file is dropped in. The mp4 file is also stored on the same usb in the same folder.

  


  Things are starting to get kind of complicated, and a little above my pay grade.

  


  If anybody has solutions please let me know, maybe the batch script I stole off the internet is wrong.

  


• Using ffmpeg, I'm trying to mute all 5.1 channels of audio for a period of time within a video

  1er novembre 2019, par cozmonaut

  I’m wanting to mute audio for a portion of a video clip while keeping the video exactly as it is.

  I came across this online.

  ffmpeg -i ~/Downloads/in.mov -vcodec copy -af "volume=enable='between(t,0,3)':volume=0" ~/Downloads/out2.mov

  Although it works, it converts the 5.1 audio to stereo. Isn’t it possible to mute the first 3 seconds of all 5.1 channels of audio, while keeping the 5.1 channels intact within the finished output video file ?

  Here are the specs on my video/audio clip :

  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  
  Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
  
  Stream #0:2[0x102]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s

  Thank you.