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• How to update paperclip video location after processing in rails

  15 octobre 2011, par user892583

  I'm using Paperclip for processing a user uploaded video with ffmpeg. I want to create a thumbnail image as well as convert the video to a standard format of my choosing. I have the ffmpeg processing working, however, I can't seem to figure out how to update the record after it has finished processing. I've used a number of rails - paperclip - ffmpeg references but haven't seen anyone converting the video and then using the converted video in the rails db, since it's creating a new video I will need to be able to update the record from within the paperclip processor, but how to do it ??

  Thanks

  • using Rails 3
  • using paperclip processor with ffmpeg

• Drawing on video with ffmpeg

  5 novembre 2011, par waxical

  I'm trying to get some blocks of colour overlayed/burnt into video with ffmpeg. A bit like a watermark, I suppose but not a logo, just a block of color.

  I've looked at using the drawbox function, which appears to me as if it's only applicable to creating images, not video. Alternatively, I could layer an image on the video.

  Has anyone got experience with this sorta thing ?

• Convert FLV video with alpha channel to PNGs with transparency

  8 octobre 2012, par AZAR

  I have some FLV videos with alpha channels, and I want to convert each of them to PNG images using ffmpeg but keep the transparency.

  So far, I've tried this :

  ffmpeg -i input.flv -an -y %d.png

  But this outputs the PNG files with black background.

  Is there any way to do this ?

  Alternate acceptable solution : If I can output the images and give the alpha channel a certain color of my choice. I can then remove it later via imagemagick and convert that color to transparency.