Love Panna but not down with P2

But that only works if the overall length of the program doesn't change. That's the part I'm having trouble verifying. If you take an hour-long program, it's constructed of 7200 15-frame GOP's. Now, if you snip out one second in the middle (two GOPs) and smush the rest of the timeline together, I can see how it could turn around and deliver that to broadcast with no re-rendering. Maybe. Not 100% sure it could, but I can see how in theory it's possible. None of the other GOPs would have been affected.

But: if you instead snip out just one frame -- let's say, the first frame, then you disrupt the entire 15-frame boundaries of every GOP in the program. And so those GOPs will need to be re-rendered to a new, 15-frame-bounded GOP structure. The GOPs can't be left alone, because they no longer would abide by the old frame boundaries. They'd have to be uncompressed and then have new groupings of 15-frames be re-compressed.

The only way this could be avoided is if there was some provision for dynamic GOP-length changes permitted within a program stream. Something that lets it say "okay, this GOP is 15 frames, the next one is 12 frames, the next one is 8 frames, the next one is 15 frames", etc. In the reading I did, I never came across such a concept.

I think I'll drop a line over to Pinnacle and see if they make such a claim, and if so, if I can get to the bottom of how it works.
 
Just for you I've made a video of a Liquid6 timeline which displays how HDV works in Liquid 6. You can cut and dice at will and place effects and then send directly upstream (broadcast) or to tape or back to a camera.

It IS a beautiful thing for broadcast/vortex because the FX and transitions can be rendered uncompressed RGB or MP@HL422. The rest can be left if it's original state. You are correct in the fact that it does re-order and standardize the GOP after edit. It's the recompression that is overcome.

Here is the link:
http://www.planetliquid.us/web_video/szn89hdvfriendly.wmv

Now if we can just get the DVCProHD codec and the Varicam support on the Pinnacle timeline, it would be great. If you want the straight scoop you can visit the Pinnacle forum.

best,
 
yeah id like to know the answer to this as well ...how can you move the gop and put new i frames onto frames that are not i frames and do not even really exist without recompression? even as still, i think alot of people will use the cineform wavelet technology for HDV in vegas or ppro, but ive got to wonder about straigh on timeline HDV editing.
 
stephenlnoe said:
HDV's file format is M2T which is HDTV. Anything shot on an HDV camera is broadcast ready unless it needs editing. You guys talk alot of smack....

I'm not an HDV champion but it does have a very important place, right now.
Click to expand...

Not all HDTV broadcasts are MPEG2, some are MPEG4, and all of them broadcast at lower data rates than HDV, so nothing shot on HDV is broadcast ready. Everything needs to be transcoding.

Graeme
 
stephenlnoe said:
Just for you I've made a video of a Liquid6 timeline which displays how HDV works in Liquid 6. You can cut and dice at will and place effects and then send directly upstream (broadcast) or to tape or back to a camera.
Click to expand...
Stephen, thank you for taking the time to do that! I went to Pinnacle to try to download a trial version of Liquid 6.1, but I guess they don't make trial/demo versions available?

What you demonstrated on the timeline is exactly how I would expect it to work, from the description I read about the SmartGOP technology. The part that still, to this very minute, I can't grasp is: how can it render that out to an HDV transport stream without recompressing? I just don't get it.

For editing it makes perfect sense -- the SmartGOP technology lets them search within any GOP to find the start frame, and I would expect all native HDV editing programs to work that way. But to render it back out to the finished transport stream without recompressing? How can it possibly do that? Is there some sort of splicing-GOP technology going on, that I haven't kept up with?

Fascinating. I've got a ton of transport streams here, I'd love to play around with it and see what it does. That would be unprecedented functionality for HDV editing -- MPEG-2 is a very lossy compression system, if it can somehow copy unmodified back out to the final transport stream, that is huge news.

Is there a demo/download/trial version available? If so, do you know where? I tried to find one but couldn't.

Thanks again!
 
Barry_Green said:
... and he spent most of that on skateboard wheels for the dolly...
Click to expand...
Hey, I have a skateboard dolly too! $37 for new wheels is a rip-off unless you had to buy berrings too!

and Shannon, sorry boss, it my last thread you came to my defence and I asked you to marry me, didn't realize you were a guy. And a very BIG guy at that. . . oops! lol
Thanks though.
 
Hard Drive

Hard Drive

[font=&quot]BiLGaMi Video Productions[/font][font=&quot] :beer:[/font]

On one of the postings somewhere in here someone posted a site that showed a possible hard drive that may work with 200. The site pictured a Sony cam with the hard drive mounted on the handle shoe mount if this rings a bell for any could you plz repost the link plz. thank you[font=&quot]
[/font]

[font=&quot]bilgami@hotmail.com
http://www.bilgamivideo.com[/font]
 
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