re-rendering MPEG2

goshep wrote on 12/20/2004, 7:37 PM

Hey all,

I've been tasked with rendering an existing mpeg2 file in variable bitrate to a constant bitrate of 5 mb/s. My question is: will the resoultion be any better if I render the new clip from the original uncompressed clip? I understand the lower btrate will effect the quality but will re-rendering the mpeg have an additional effect? I suspect it will but will it be significant enough to warrant the trouble of obtaining the original uncompressed clip?

Comments

ScottW wrote on 12/20/2004, 7:53 PM

Use the source Luke!

MPEG-2 is a lossy compression format - information lost during compression cannot be recovered. Re-rendering from an MPEG-2 puts you yet another generation away with a higher level of errors because of the lossy source.

goshep wrote on 12/20/2004, 8:15 PM

I figured as much. Thanks for the heads-up.

B_JM wrote on 12/21/2004, 5:04 AM

curiosity makes me ask why you would have to re-render from VBR to CBR

if you just have to lower the bit rate a little - there are other solutions ..