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In-program lag when dropping video setting onto large batches. Normal?

347 Views 3 Replies Latest reply: Mar 9, 2012 6:20 AM by nerdwithin RSS
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Mar 8, 2012 7:22 AM

I'm encountering a lot of in-program lag when I drop video settings onto larger batches of files. It takes 10 minutes or more just to apply the codec to the files BEFORE I submit the batch for conversion. Is there any way to speed this up? It's slowing down my workflow a lot. I have a large number of video files from a Canon 7D that I'm trying to convert to ProRes. The files are all relatively small, mostly 100mb or less, and I've been submitting them in batches of 25-35 files. Any more and Compressor spins forever after just applying the codec. I'm using an 8-core Intel Xeon MacPro, and didn't expect so much lag. The conversion itself runs fairly quickly and smooth. Am I doing something very wrong here?

Compressor, Mac OS X (10.6.8)
  • Russ H Level 6 Level 6 (12,880 points)

    I'm afraid Compressor is not very good at doing that kind of a batch transcode. Use an alternative app like MPEG Streamclip, which is much more efficient than Compressor in processing batches and does faster encodes unless you have a serious cluster set up.


    Good luck.



  • Pinc Level 1 Level 1 (35 points)

    Yes, for most basic conversion tasks, Streamclip is about an order of magnitude faster in transcoding, and two or three (sometimes more) orders of magnitude faster using the interface.


    The lag you describe in Compressor happens when using any type of source material not natively supported (i. e. almost anything that is not QuickTime, DV or MPEG-4.)


    When requesting any kind of information about the clip, all other formats are first piped through the appropriate preprocessor, e. g. Perian or Flip4Mac. Apparently Compressor does not cache any of these pieces of information, so for every access, the entire preprocessing is done again, which can be an incredible nuisance.


    If possible, use Streamclip, which handles "alien" formats much more efficiently, to convert the material to QuickTime, before putting it through Compressor. My advice is to use Compressor only if if you really need it for a special job, such as high-quality framerate conversion, at which it is good, albeit extremely slow.


    If you are going to apply the exact same settings to a bunch of files, use a Droplet. There you usually have to wait only three times for the preprocessing to complete: it is normally faster than going through the full Compressor interface hassle.





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