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Calvin
best quality for broadcast w/ limited filesize
on Sep 21, 2005 at 1:54:50 pm

Hi all, I had an interesting problem yesterday, and I'll probably have to do this again soon. I had 3 hours to compress & upload 6 minutes of footage (DV-NTSC) & had to keep it in the best quality possible for broadcast. I ended up using Compressor photojpeg-75, and knocked down the quality to medium-low, as my upload speeds are limited to 60K/sec. ( about 300Meg total filesize possible)

What's the highest quality codec you'd use in this situation- I only had about 10mins to come up with a good codec, and I'm sure there's a better choice than the one I made. - also I thought it was important to retain interlacing & source dimensions.

Calvin.


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Charles Simonson
Re: best quality for broadcast w/ limited filesize
on Sep 21, 2005 at 5:15:00 pm

If you wanted to best retain interlacing, then MJPEGa or b would have been a better choice than Photo-JPEG. For 300MB and 6 minutes, your bitrate could be around 6500kbps, more than adequate to maintain high quality and efficiency at SD for almost any codec that supports proper interlacing. An all i-frame MPEG-2 encode, or MPEG-4 or even Apple's Intermediate Codec (although AIC for movement between systems can be unadvised) are possible solutions. I probably wouldn't encode content for to an interlaced output using Windows Media.


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Calvin
Re: best quality for broadcast w/ limited filesize
on Sep 21, 2005 at 9:51:45 pm

Thanks, I'll try some testing with those codecs

Calvin.


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Ben Waggoner
Re: best quality for broadcast w/ limited filesize
on Sep 21, 2005 at 11:23:28 pm

In fact, I'd probably go with straight up MPEG-2 as the most efficient interlaced codec easily supported in QuickTime, assuming you can ingest it on the other end. It can look broadcast quality at 6.5 Mbps for a wide variety of sources.


My Book: http://www.benwaggoner.com/books.htm
Squeeze and ProCoder tutorials: http://www.classondemand.net/benwaggoner/
Compression Class at Stanford: http://www.digitalmediaacademy.org/compression.html


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