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• FFMPEG on Heroku exceeds memory quota in testing

  5 juillet 2022, par Patrick Vellia

  After following this tutorial, and getting it to work locally on my own development environment, before really getting my hands dirty and working deeper on my own project implementation, I decided to push it up to Heroku to test in a staging environment.

  


  I had to have Heroku add the FFMPEG build-pack and turn on the Redis Server for ActionCable to work.

  


  I didn't link the staging to a cloud storage bucket on Google or Amazon yet, just allowed it to upload directly to the dymo disk for testing. So it would go into the storage directory as it would in development for now.

  


  the test MOV file is 186 MB in size.

  


  The system uploaded the file fine.

  


  According to the logs, it then copied the file from storage to tmp as the tutorial has us do.

  


  Then it called streamio-ffmpeg's transcode method.

  


  At this point, Heroku forcibly kills the dymo because it far exceeds the memory quota.

  


  As this is a test environment, it's only on the free tier of Heroku.

  


  I'm thinking I won't be able to directly process video projects on Heroku itself, unless I'm wrong ? Would it be better to call an API like Cloud Functions or Amazon Lambda, or spin up a Compute Engine long enough to process the FFMPEG command ?

  


• Heroku FFMPEG HEVC Video with Alpha support ?

  15 septembre 2022, par Patrick Vellia

  I am looking for a way to handle converting videos like Webm VP9 with alpha channel to HEVC with alpha mov or mp4 files that are playable in Safari (The Webm will work in all other browsers).

  


  While I can do this locally in my Rails app using streamio-ffmpeg gem and the havoc_videotoolbox encoder, this only works on Apple hardware.

  


  Therefore if I push it up to Heroku and use the Heroku ffmpeg build pack, the HEVC VideoToolbox is not available for use.

  


  FFMPEG does have the libx265 encoder but I can't find the property for this one to preserve the alpha channel.

  


  ffmpeg -I INPUT -c:v libx265 -preset medium -crf 26 -tag:v hvc1 OUTput.mp4


  


  there is a -x265-params flag, but I can't figure out which param will enable the alpha channel.

  


  I am hoping this is actually possible for my production app, otherwise I'd have to process this segment of our media locally and manually upload the HEVC components.

  


  Local Configuration
Apple Monterey with ffmpeg 5.1.1 installed on Intel
Rails 7

  


  Heroku

  


  FFMPEG build pack

  


  Hobby Plan

  


  Rails 7

  


• avdevice/dshow : fix regression

  25 mars 2022, par Diederick Niehorster

  avdevice/dshow : fix regression
  a1c4929f accidentally undid part of d9a9b4c8, so the bug in ticket #9420
  
  resurfaced. Fixing again.
  Signed-off-by : Diederick Niehorster <dcnieho@gmail.com>
  
  Reviewed-by : Roger Pack <rogerdpack2@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavdevice/dshow.c