Render from MPEG2 Source Blacks Out

Ron Lucas wrote on 8/19/2002, 9:55 PM

Using VV30c, I've rendered a few different 90 minute MPEG2 files with the field order set to "lower field first". When watching these videos, they plays back perfectly without any problems either in Media Player on my computer or on a DVD disk on my TV.

Now I'm trying to bring any of these 90 minute MPEG2 file into a new project in VV30c to create small video clips from the large videos. No matter what type of file I try to render to (WMV, MPEG1, MPEG2, or AVI) I get a short 1 second black out of video while the audio continues without a problem. This black out happens at different times in different videos.

In playing around with this, I tried setting the field order of the event itself to "None Progressive Scan" just to see what happens at the same moment in time. In this case, even though the field order gives me unwanted results in viewing the new smaller rendered file, the black outs do not occur. Therefore, it seems to me that VV30c is having trouble reading MPEG2 files, which it created, correctly to use as source material.

Any ideas? Has anyone experienced this? I did a search and found one person described a similar situation, but I did not see a solution. I understand that I might not want to use MPEG2 as source material, but I have no choice.

Thanks,
Ron

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Comments

cef wrote on 2/12/2003, 8:25 PM

oooops, when i said "update from the old vv version to vv3", i meant i was using vv3b then updated to version 3c.

kerrying wrote on 2/12/2003, 9:17 PM

Like SonicEPM put it, Blackout you probably got lucky with the black frame issue on VV4. So are you ceffie, I would say.

The project that I was talking about as an example in my previous message practically uses high bitrate (ok, maybe not so high, just approx. 2.5 times higher than that of a PAL VCD-compliant mpeg1, that's as luxurious as I can be, I have very limited storage space back then with little budget) mpeg1 files and black frames occurs, luckily just twice in the 30 min ++ rendered video. And the interesting thing is, one of them showed up in the timeline while another don't. And working on the project on a brand new, and faster machine (P4 2 G, with almost 1 G RAM) of a colleague of mine, no black frame, at all, on the timeline but, the still came up as pains in the neck, twice, at exactly the same spots. Sigh, mysteries...

But, I am lucky, a second project using different footages from the same batch has no black frame or whatsoever. BUT..., missing audio of approx. 25 seconds somewhere near the end of the rendered video, despite the fact that the source footage plays fine in Windows Media player with everything present, grrrhhhhhhh...

And to further convince us all that those who got no black frame when working with mpeg simply got lucky, I actually took a quick look at the release note of VV4 and guest what, the first item under the Known Issues section mentions black frame which, I believe, is what we have been talking about here.

Still, any technical explanation on this? Anyone? Anyone?

I gave up on the black frame damnation, but anyone has any idea about the missing audio?

Thanks a lot, folks.