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HD - MPEG2 MP@ML compression

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PatMPZ
HD - MPEG2 MP@ML compression
on Aug 2, 2007 at 10:40:59 am


Has anyones compressed HD material to MPEG2 MP@HL? I've already compressed HDCAM with Canopus Procoder (1920*1080, 25i, MP@HL, 25CBR...) and it looked really great in the screenings playing from soloist 4111. The things`s that for complex images I still had to blur some areas with lots of detail and even doing that, it showed some "artifacts"(?). HAs anyone some experience with this type of compression? I don't know if this type of software (Canopus Procoder, Sorenson Squeeze...)and MPEG2 are the best choice for HD compression.

Thanks in advance



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Ben Waggoner
Re: HD - MPEG2 MP@ML compression
on Aug 3, 2007 at 6:19:01 am

I've done a ton of stuff with ProCoder in MP@HL, and it remains my favorite tool for it.

Can you share the settings you're using with it? For HD, go for Mastering Mode. You should get pretty transparent with 25 Mbps CBR.

Also, for HDV source that's 1440x1080, make sure to keep ProCoder in the same resolution (and in 16:9 aspect ratio).

My compression blog: http://on10.net/blogs/benwagg/

My compression class at Stanford: http://digitalmediaacademy.org/courses/video-compression-training.html


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PatMPZ
Re: HD - MPEG2 MP@ML compression
on Aug 3, 2007 at 7:31:30 am

Thanks for your reply! I just used a trial version of Procoder Express (we're planning to buy a compression software, so we're trying a few), and compared with my preview compression in Adobe Media Encoder, the results were better and faster (15 minutes to compress 3 minutes of non compression .avi file)
Settings:
Generic ISO MPEG stream, MPEG-2 Program Stream, 1920*1080 25 fps Upper Field First (the Soloist player only admited interlaced media), 16x9, MP@HL 25CBR, Highest Quality, Intra DC Precision: 9, Error Protection, no emphasis, and that's all.

But, as I said, I still have to blur some image areas to "hide" artifacts. Could it be a limitation of MPEG2? What about using H.264?

Thanks again in advance.



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Danny2007
Re: HD - MPEG2 MP@ML compression
on Aug 3, 2007 at 9:27:14 am

You'll get MUCH better results from H.264 at the same bitrates, or the same quality at roughly half the bitrate compared to MPEG-2. It all depends what you what to do with your output.

Check out slides 18-20 in this PPT/PDF

http://video.ldc.lu.se/pict/WM9V-MP4AVC-MP2V_comparison-Goldman.pdf



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Ben Waggoner
Re: HD - MPEG2 MP@ML compression
on Aug 3, 2007 at 7:26:08 pm

Does ProCoder Express support "Mastering Mode"? That'll help further improve quality.

The full ProCoder 3.0 is only $500, and a quite capable tool.

My compression blog: http://on10.net/blogs/benwagg/

My compression class at Stanford: http://digitalmediaacademy.org/courses/video-compression-training.html


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Imthinking
Re: HD - MPEG2 MP@ML compression
on Aug 11, 2007 at 7:01:42 am

Ben:

I recently just dived into HDV and have loved the process of learning until I tried making a SD DVD from HDV footage using Avids codec - Boy what a frustating time it has been. I have Sorenson and the images just keep coming back with artifacts through the roof. I downloaded a copy of Procoder and bam I love the image. Do you know something I don't? Probably it wasn't meant as a rhetorical question hehe. Does procoder do something that Sorneson doesn't I would love to use Sorenson since I own it but will fork over the cash if need be. The settings seem to be identical in both programs and when i look at the footage side by side the procoder comes out on top!

Thanks
PS do you have a blog on transcoding HDV for a SD DVD delivery!



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Ben Waggoner
Re: HD - MPEG2 MP@ML compression
on Aug 11, 2007 at 3:43:45 pm

I honestly haven't done much hands-on HDV work these days - I'm mainly coming from higher bitrate sources.

ProCoder uses the superior Canopus MPEG-2 encoder, while Squeeze uses Main Concept, but that shouldn't be a big difference. Which version of Squeeze do you have? Versions before 4.5 had a poor quality scaler, which made resizing pretty ugly.

My compression blog: http://on10.net/blogs/benwagg/

My compression class at Stanford: http://digitalmediaacademy.org/courses/video-compression-training.html


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Imthinking
Re: HD - MPEG2 MP@ML compression
on Aug 12, 2007 at 3:41:59 am

V 4.5 is what i have. I have put the video side by side and their is a marked difference. It seems that a lot of people like the Canopus so that is what I will buy as I can see the difference in my own eyes. I have a project to shoot that will go out to 400k students in 08 so I need to get onto other learning items :)

Thanks



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