mpeg-2 encoding problem

[John Rofrano]

> I have a large quantity of analog video captured with an ADS Pyro AV link Pro into uncompressed AVI, and I’m attempting to compress it down to reduce storage space.

Actually, the ADS Pyro A/V Link captures DV video which is compressed at about 5:1.

> I’m using Vegas 6 for editing, but I am using TMPGEnc 2.5 to do my encoding to Mpeg 2 (due to Vegas’ disappointing lack of a batch converter)

Have you tried: Tools | Scripting | Batch Render?

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Eric Lewis]

ok, I realize they’re not RAW, but if the folks from Sony call it ‘uncompressed’ that’s good enough for me, and they’re as close to uncompressed as I like to have to deal with (about 200+MB / min) the point is I’d like to get them into a more manageable file size. (and they do seem to be equivalent to Vegas’ “Uncompressed AVI” template…see below)

> Have you tried: Tools | Scripting | Batch Render?

yes, I’ve looked at that script, and the one I have only allows multiple outputs of the same file – I need a single type output (i.e. MPEG) of multiple files. If you know where I can find a script that does that, that would be helpful.

In the mean time, I have been running the solution I have found. It is to use Divx, rather than MPEG in TMPGEnc. It renders quicker and smaller than Mainconcept’s MPEG2, with equivalent quality.

Although it appears to have the same contrast issue on playback as MPEG, when re-imported into Vegas the issue’s not there (UNLIKE MPEG) and in-fact when re-encoded into Vegas’ “uncompressed AVI” (which brings me back to my original filesize as created by the Pyro by the way) I end up with a near duplicate of the original.

Works for me…

[Wade Harrington]

“This happens to the mpeg-2 output whether a file such as a .mov is imported into Vegas”

I had the same problem when bringing in .mov files from final cut. Somehow quicktime files, rendered out to mpeg 2, get a lot of adjustments added to the video as it renders. I apply the computer rgb to studio rgb preset in the vegas color correcting plug-in. This fixes the problem perfectly. Not sure why or how it works but it does. I fount out the hard way when taking my dv tapes to the station and all the colors were oversaturated and the whites blown out. I think it is a mac thing. (hehe)

“Note that Vegas does not work with Y’CbCr values directly. It needs to first convert the values into a R’G’B’ format- the two relevant ones are described below. Unfortunately, there is no scheme for indicating which color space is which. So, programs can’t tell which color space is being given to them.” previous statement taken from website below

https://www.glennchan.info/articles/vegas/colorspaces/colorspaces dot html