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Not happy with Compressor MPEG2 encodes; help!
Not happy with Compressor MPEG2 encodes; help!
I can’t seem to get a nice clean MPEG2 encode from Compressor. I’m used to using BitVice and get really great results with it. But I’ve heard Compressor has come a long way since I first used it many years back when it first came out.
I’m using Best Quality 90 minute DVD with multi-pass variable aiming for 6 with max rate at 8 and am finding bits of blockiness in moving pan shots over grass etc; this doesn’t happen in BitVice.
Can anyone point me to a decent tutorial on Compressor?
I’m pretty savvy with these programmes, but feel I can’t squeeze any better out of Compressor, but I’m sure the programme can do better than I’m managing.
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14 Replies
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What type of footage are you compressing?
-Russ
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I’ve had mine set for single pass VBR 4500-7000 (averages 6000)
bitrates with the GOP number set for the lowest.Quality has been just fine.
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Chances are you’re seeing the blockiness b/c the gamma has shifted. Try a 1.1 or 1.2 gamma.
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I’m with Boris above.
Set your GOP for 7 (the lower number).
This made all the difference for me.
Now I have no problems on any pans or transition effects.Dan
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Footage is XDCAM HD from 35Mbps high quality HD mode. So Compressor is down-converting to SD.
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It might not be the best way, but I like to downconvert to uncompressed before I make a DVD out of a video. I had better results that way.
-Russ
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[Danrnw] “Set your GOP for 7 (the lower number)”
Hmm, that’s funny. I’ve had no problems whatsoever with pans, etc, and blockiness. What I *have* had problems with is the well-documented gamma shift.
I’ll have to try the GOP setting for experiment’s sake. Then again, why fix what ain’t broke?
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[reel2reel] “I’ll have to try the GOP setting for experiment’s sake. Then again, why fix what ain’t broke?”
I can tell you that the lower the GOP number the more I-Frames you have and thus better quality, at the expense of a slightly larger encoded file.
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I’m doing now 6 frames GOPs (PAL) and OPEN. All the blockiness desappear. Any way with this system is necesary to rise the data-rate a bit. But I tried the DVDs in few domestic players and they play great. Probably old players will play jumpy.
Cheers,
rafael -
Great advice guys.
I had GOP set to 12, I’ve now put it to 7.
What is recommended for the GOP Stucture setting, it is now defaulting to IBBP in the dropdown with ‘closed’ checked.
Is this cool?
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