"Black frames" with Sony YUV and Net Rendering.

Liam_Vegas wrote on 3/21/2005, 3:27 PM
I'm not certain if this problem is simply due to network rendering... see prior post for more detail on the circumstances.

I have 91 clips of Sony YUV format video (created by network rendering.

Each clip is viewable in Windows Media Player.
Each clips shows a thumbnail when viewed using Windows Explorer
Open a new Vegas Project
Import all the clips into the project.
I see a continuous block of them (usually from clip 70 - 91) all appear to have no video
Open anopther instance of Vegas
Import just one of the clips that is black in the other Veg... and it comes in just fine in this one.
Do this for other clips that were black in the other project...and they all come in just fine. Eventually however - when you start loading enough clips in (even ones that were fine in the other instance of vegas) you'll get a different set of clips coming in as black.
Now I have two Vegs open. One has one set of clips that are black... the other has a different set of clips that are black.
Try copy/pasting the good ones from one veg over to the other one - replacing the bad ones.... they are still bad!

Weird hah?

I'm at a loss as to what is going on.

I think I'll have to see if Sony can chime in on this one. It is SO strange... I feel like they'll need to see the actual files (about 12GB worth).

Comments

craftech wrote on 3/21/2005, 6:23 PM
Search Black Frames or Blank Black Frames. It's an old unresolved problem.

John
Liam_Vegas wrote on 3/21/2005, 6:31 PM
John

I don't think the prior reported problem (at least the ones I remember and just went back and looked at) are anything like this problem.

Can you point me to a specific post which references the same problem as I have described?

Thanks
rmack350 wrote on 3/21/2005, 6:37 PM
Nah. I can't remember anything like this. And the black frame issue was rendering black frames into the file. This isn't, as the files actually have readable data in them.

Rob Mack
craftech wrote on 3/21/2005, 6:50 PM
It isn't quite the same, I'll admit, now that I am reading it more carefully including the other post.

Sorry,
John
craftech wrote on 3/21/2005, 7:10 PM
Why can't you render to frames, then load the frames as a background sequence and render that scene on one machine as an avi?

Liam_Vegas wrote on 3/21/2005, 7:49 PM
I have no idea what this "render to frames" is that you are suggesting... please elaborate.
Liam_Vegas wrote on 3/21/2005, 10:46 PM
Re-rendered to a destination format of standard DV AVI Widescreen (not the Sony YUV codec) and I don't get any black frames. So... the problem is definitely with the Sony YUV codec side of things.
apit34356 wrote on 3/22/2005, 4:14 AM
I have experience the black frames with/without netrendering with AVI at the end of the clips. Mostly with footage from DV Rack,source material from someone else, where I have shorten the clip. This just show up recently after some codecs were updated, I have not yet id the source of the problem.
Liam_Vegas wrote on 3/22/2005, 6:16 AM
Remember - in my case the black frames are not really there (at least there are circumstances where Vegas will show the clips just fine.
farss wrote on 3/22/2005, 6:35 AM
So from what you're saying the issue is with their codec decoing the frames, well that's as close as I can guess it.
Now what happens when you render that clip out to say DV25?
Even just try rendering those few black frames out.
I have seen an issue where sometimes the audio over/underruns the vision by half a frame or so. This can lead to an unwanted black frame at the end of a clip but I've never seen this happen at the start of a clip.
One thing you might check. If you look at the media properties what does Vegas think it's trying to decode and what codec is it using.
Apart from that this sounds like a good one for tech support to scratch their heads over.
Bob.
Liam_Vegas wrote on 3/22/2005, 6:46 AM
Now what happens when you render that clip out to say DV25?

Sorry... that's what I did (a few posts up)... although I called it rendering to "DV AVI widescreen" and not DV25. Doing this the problem disappears.

Remember that these clips (6 second segments - created by Net Rendering) will variously be completely black in one instance of Vegas - while in the other - they will be perfectly ok. This is not just a few black frames here and there.

When they are "black" the media properties will show audio but no video stream. For clips that are not black - the media properties does show it is the Sony YUV codec.

The other strange thing with the clips is that although I am rendering a 720x480 widescreen project the media properties after rendering to Sony YUV always set the pixel aspect to .909 (regular DV) and not 1.2121 (widescreen). I have to manually alter the properties to get it working (for the clips that aren't black that is).
apit34356 wrote on 3/22/2005, 8:07 AM
" black frames are not really there", this the same in that the frames do not exit outside of vegas timeline.

Sorry, Liam, was hoping the Meda10 codecs or DX9 Direct was at fault.