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Old Aug 27, 2005, 1:51 AM   #1
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I found TMPGEnc, with QTReader.VTP plugin, could convert the V550 MPEG-4 movies to MPEG-1 (w/o license) and MPEG-2 (need license beyond 30-days) files. Quite convenient. Performance quite acceptable (on Pentium-M 1.7GHz 512MB). The output mpeg-1,2 files will be used only as intermediate data for finally burning onto to DVD.

My question is:

What are the optimum bit-rates for the conversions?

Facts:

1. I notice not much diff in qualities btwn MPEG-1 & MPEG-2. (Maybe my eyes are not sensitive enough )

2. V550 MPEG-4 is natively 0.5MB/sec

3. For MPEG[1,2] bit-rates below 2MB/sec will show the output movies as quite "blocky", or "grainy"

4. For MPEG[1,2] bit-rates above 4MB/sec, again, I can't notice any diff in quality btwn diff bitrates.

5. At MPEG[1,2] bit-rate of 4MB/sec, the filesize are roughly the same as the original QT MPEG-4. Beyond that the filesizes grow roughly proportionally larger.

6. The theoretical optimum bit-rate of MPEG-1 is only 1.5MB/sec.




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Old Aug 27, 2005, 8:14 PM   #2
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But since MPEG-4 is claimed to be a more efficient compression than MPEG[1-2], I don't think a same filesize of MPEG[1,2] at 4MB/sec, as MPEG-4, will produce the same quality as MPEG-4

i.e. it should be larger, but how much larger?
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