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Pulsing Video on SD DVD
Problem:
Pulsing background on SD DVD projects. It’s two pulses/jerks per second with even frequency.
The shots are glidecam outdoor wedding shots with super detailed foliage and trees in the background.
This has happened on two projects. Both shot HDV on Canon XH-A1.
The first project was HDV>SD down-converted on capture. The second project was HDV native, converted to SD using the “Bonsai” method.
Intuition tells me it’s a compression issue.
I’m using a 2.3Ghz G5, 4gig RAM, FCS 2.
Is my computer not tough enough?
Is there a setting in DVDSP/Compressor I’m over-looking?
Would a re-install of Final Cut remedy this?
Anyone else seen this anomaly?
Thanks! -
4 Replies
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I suspect what you are seeing is the characteristic pulse caused by the 15 frame GOP structure of MPEG-2 encoded with the standard presets in Compressor or DVD-SP. I can’t explain it technically for you and there is not always a cure. For the detailed moving background you have, I’d try to maximize the data rate as much as possible, pushing up close to 7Mbps. Too high a rate can cause compatibility problems for your burned disks, however. You can try modifying one of the CBR presets to a higher data rate and use that instead of a VBR preset. I also find that the pulsing I’m referring to shows up more on some monitors than others (particularly LCDs).
The Compression Techniques forum on the Cow might yield some answers, too. Another MPEG-2 encoder might work better than Compressor (Bitvice, Main Concept, et al).
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Thanks Tom!
I never was too aware of GOPs.
I succeeded in fixing the pulsing by encoding on someone elses MacPro.
The encode settings appear the same as my G5 so I don’t understand why my computer is having this problem. -
I find that the pulsing can consist of very tiny fluctuations in the color of the pixels and that one monitor will show them and another will not. It could be as simple as a difference in monitor brightness and contrast calibration between the two systems.
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I’m sure that it’s my G5. I’ve taken the “pulsing” project dvd and played it on other players and sen the same thing.
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