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1.5 hour video (HD convert to DVD in Compressor) bad only in spots

224 Views 3 Replies Latest reply: Dec 2, 2012 9:46 AM by Russ H RSS
Eric Pensenstadler Level 3 Level 3 (675 points)
Currently Being Moderated
Dec 1, 2012 6:06 AM

As the subject heading says, I am taking HD video exported as self-contained from FCP 7 and converting to SD (DVD) in Compressor 3.5.3. 


I know there will be quality loss, that's not the issue.  The problem is that no matter how many time I re-export, re-burn, the final video on DVD gets really bad in the same two spots (and last for a couple minutes).  By "bad" I mean very pixelated and jumpy (sorry, "jumpy" is the best work I can think of to describe the flickering occuring).


I'm at a loss, and really confused as to why it would keep occuring at the same two spots (and yes, the original export is crystal clear the whole way through, even in those two spots).  Both times this occurs it is towards the end of the video.  First at around 1 hour 10 minutes, then at about 1 hour 25 minutes through the end of the video. 


I hesitate to say this because I'm not 100% certain, but it almost seems like the quality gets worse as the video goes on, but it might just be me. 


Help or advice would be greatly appreciated.


Thank you,


MacPro / PowerBook G4, Mac OS X (10.6.6), FCP 7.0.3
  • Russ H Level 6 Level 6 (12,945 points)

    Eric Pensenstadler wrote:


    As the subject heading says, I am taking HD video exported as self-contained from FCP 7 and converting to SD (DVD) in Compressor 3.5.3.

    What kind of HD video (codec, frame size, frame rate)?


    Try testing only the problematic sections by marking in and out points in the Preview window - say two separate 2 minute files. If the artifacts are still present in these test files, try inserting compression markers at the point where the problems first appear. If they the problems don't appear on the test segments, turn on frame controls and set Resize Filter to Best and re-encode. (Sorry…this will take a while.)



  • Russ H Level 6 Level 6 (12,945 points)


    Eric Pensenstadler wrote:




    I'd still welcome any more feedback.  But for now I'm making the discs and sending them out and if anybody complains then I'll just tell them that the drawback of converting HD to DVD.  They should get the bluray!


    Thank you,


    Hey Eric,


    That's a great attitude!


    If you're interested  in exploring this further, here are some screen shots to illustrate some adjustments that might help.


    First, starting with the standard preset.


    Screen shot 2012-12-02 at 12.16.10 PM.png


    With the job selected, in Exttras, I've set the output device to HD  (so I can make multiple copies and  tests).


    Screen shot 2012-12-02 at 12.08.17 PM.png


    In the Inspector>Encoder, I can adjust the bit rate to make sure the content will fit on a single layer DVD, On this case, I have chosen CBR @  4.5 Mbps; If it were a sort movie, I might go as high as 7.5 Mbps.


    Screen shot 2012-12-02 at 12.12.22 PM.png


    In the Inspector>Frame Controls, I've turned on Frame Controls and set the Resize Filter to Best (Statistical Prediction). It's going to be re-sized from 1080 to 480 so it needs all the help I can give it.


    Screen shot 2012-12-02 at 12.09.24 PM.png


    Looking at the Summary pane, I can confirm the changes that were made to the settings will be applied.


    Screen shot 2012-12-02 at 12.09.47 PM.png


    I can save this as a custom setting if I want.



    You're right that going from HD to SD MPEG2 can be problematic. So much is content dependent, that it's hard to give a one-size-fits-all formula for success. Generally, I've had extremely favorable results and I'd much rather start out with a large amount of pixels than not.


    It's possible the length of the video is a factor in generating the artifacts you see or a combination of that and the content at those points in the movie. Try some of the adjustments available through the Inspector to see whether you can come up with the correct recipe.


    Good luck.




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