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mpeg2 via compressor/episode contrast issue
Hi!
In order to play a paintings movie in a museum through a hard disk Canopus I’ve compressed a dvcpro-hd sequence in mpeg2 1080i50 via compressor/episode. The problem is there is too much contrast with black shadows when the dvcpro-hd is correct (calibrated with control monitor and wave display).The settings are :
– output format : MPEG-PS (mpg)
– encodage mpeg2 quality based (peak :27000 Mbits/sec, average rate 19000)
encoding quality 100%
colour space same as source
8 bits
resize : 1920×1080
I’ve made before a version in standard mpeg2 for a dvd via only compressor and it was correct the HDV exports are correct too.Could you help me ?
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12 Replies
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Could be that some trickery around BT.601 and BT.709 colour-space conversion between is going on somewhere in the chain.
What Canopus device is playing this back?
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Thank you Daniel I will explore this way. But I’ haven’t found anything about BT601 BT701 on the episode user guide. What does it mean ?
I don’t know yet for the Canopus. I will receive it tomorrow. I’ve just notice the problem with quicktime player and another hard disk video player : the DVICO M-6500 -
What’s it being displayed on? Have you calibrated the monitor or projector?
Ed -
On a calibrated monitor (JVC DTV24L3D via Kona 3). The dvcpro-hd and hdv playbacks are ok on it and on QTplayer on the Mac as well as mpeg2 from compressor compressions but not from compreesor + episode
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I’m not sure what you mean “compressor+episode”. All I can say is that Episode and Compressor both have pre-processing tools (gamma, restore black, etc.) to get the video looking the way you want. I use both products, and Bit-Vice and others, and they all look different (especially Bit-Vice’s gamma).
Ed[philippe muller] “On a calibrated monitor (JVC DTV24L3D via Kona 3). The dvcpro-hd and hdv playbacks are ok on it and on QTplayer on the Mac as well as mpeg2 from compressor compressions but not from compreesor + episode”
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BT.601 and BT.709 are colour spaces used for standard def and High def video.
It’s common for problems with contrast to happen when this conversion is done or not done correctly.
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I mean episode compression launched from compressor (in fact an export from FCP via compressor with episode settings).
OK Daniel but how can I tuning them? I haven’t found any settings for chosing them on Episode. (for coulour space there is only ‘same of source’ or the coding depth 4.2.2 and 4.2.0) I set same of source (dvcpro-hd) and the result is bad. -
Try using the colour space of 4:2:0, which is what this MPEG-2 will likely use.
You can also adjust your colour settings using the filters in compressor to compensate for the errors you are getting.
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4:2:2 is only used for High Profile MPEG-2 anyway. Here’s a link to gamma, contrast, black and white restore, etc. that you might find helpful:
https://www.kenstone.net/fcp_homepage/preprocessing_hodgetts.htmlEd
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In my experience, black and white restore are best avoided unless you have the time to step through every frame of your clip looking for excesses in the restore processes, or the setting are at the absolute minimums
__________________________________________________________________
Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!
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