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• Batch File Removing File Extension

  29 décembre 2013, par scsa20

  So I've made a batch file to help me extract the video only from an MKV file using MKVToolNix and then re-encode the h264 file to an MP4 for video editing using mp4box. It works really well, this is how it looks :

  for %%a in (*.mkv) do "C:\Program Files (x86)\MKVToolNix\mkvextract.exe" --ui-language en tracks "%%a" 0:"%Sources%\h264\%%a.h264"

  for %%a in (*.h264) do mp4box.exe -add "%%a:fps=23.976" "%Sources%\%%a.mp4"

  Problem is, the first line would extract the file with .mkv.h264 then when I go to encode the file with mp4box to a MP4 file it comes out as .mkv.h264.mp4.

  Is there a way to code it so it'll drop the first 2 extensions and leave only with the .MP4 ? Searched around and can't find my answer for something that is after the fact (all the ones I've found is for removing the last extension which doesn't help me).

  Thank you for any help.

• ffmpeg : Crop webm file with circular .png mask [closed]

  26 mars 2021, par Beneos Battlemaps

  I tried everything for hours and can get it working by myself. I want to create animated Pen&Paper tokens for virtuale tabletops. I have a .webm video file with 720x720 pixel showing an animation of a render file created out of a png sequence via

  


  ffmpeg -framerate 24 -f image2 -i face.%04d.png -c:v libvpx-vp9 -pix_fmt yuva420p face1.mp4

  


  See here : https://webmshare.com/play/ZxZa0

  


  Now i want to overlay this .webm with an circle image as frame :

  


  overlay

  


  and crop the black part so its transparent in the end result as well as keeping the transparent area in the center for the video itself.

  


  So the endresult is from this :

  


  Face1

  


  to this :

  


  Face2

  


  Can you help me out with that ? If its easier i can split the steps, making first the alpha mask crop via png and adding the circle in it later.

  


  Beste regards in advance
-Ben

  


• How to write exif tags when creating MP4 file with ffmpeg

  4 mars 2020, par Michael

  I see lots of questions asking about how to add EXIF tags to MP4 another other media files with ffmpeg. I am not interested in doing this. I currently have an exiftool command that I am running after the fact, but this takes some time because it has to rewrite the entire file.

  What I would like to do instead is to add the tags to the MP4 file while I am originally creating it so that I only have to write the file once.

  I found this page on creating metadata, but it does not list any of the metadata I want to set. In am trying to set all the timestamp tags, making sure they are properly set to UTC when applicable as is the case with some of the track/media timestamps.

  Update : I see this question has attracted a downvote and a vote to close due to claims about it being off-topic as it allegedly is not about programming. I am using ffmpeg in a bash script which does some automation, so I’m not sure why this claim is being made. There are certainly other similar questions (just look at a few with the ffmpeg tag).