I haven't seen the paperclip code but I think you can look at the preprocessors used by default by paperclip. You usually see logs when paperclip does some processing using rmagick which may be a clue as to what part of the lib you want to look at.
On Wed, Jun 12, 2013 at 11:15 PM, Walter Lee Davis <[email protected]>wrote: > I have been using CarrierWave for file uploads on a site which needs to > accept a really wide range of different movie formats, stills, PDFs... And > I have been struggling with making thumbnails of certain formats. After > much yak-shaving with ffmpeg and imagemagick and Rmagick, I finally decided > to do a little spike app with nothing but Paperclip. I set up the simplest > thing that could possibly work: > > has_attached_file :blob, :styles => { :thumb => ["320x320>", :png], :large > => ["1500x1500>", :png] } > > And no matter what format (within reason) I pass to it, I get a nicely > formed PNG format thumbnail and large preview image. PSD, PDF, TIFF, MOV, > M4V -- it Just Works™. And I cannot figure out how it is doing this, > despite reading through the source code for quite a while. > > The reason why I need to access the magic is that while I am getting a > nice thumbnail from any movie format I pass in, I am getting the very first > frame of the movie (usually black) rather than a few seconds into the clip. > In my CarrierWave converter, I had a custom offset time defined for this. > But I cannot see where Paperclip is defining what to do with a video to > generate a PNG image so I can alter this default. > > There are tons of examples on SO and the Web in general, showing how to > create a custom video thumbnailer and transcoder, but I would like to avoid > rebuilding this wheel that Paperclip seems to have hewn out of pure Elven > magick. > > Thanks in advance, > > Walter > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/87E1CB56-F23E-4EF2-A760-9F6D6A2C0B74%40wdstudio.com?hl=en-US > . > For more options, visit https://groups.google.com/groups/opt_out. > > > -- ------------------------------------------------------------- visit my blog at http://jimlabs.heroku.com -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAJ8y7Vdt3BKPzFd%2BzQDsLnNA2G0%2BY2d0pa9fc4RQFVVH6kLuhA%40mail.gmail.com?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
