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LarsHD
wrote on 2/9/2010, 6:17 AM
Comments
rmack350
wrote on 2/9/2010, 9:49 AM
Lars,
So far it sounds like no codec is giving you stutter free playback from the timeline. Your epic journey is getting a bit to long to keep track of but the short of it seems to me to be that:
1. all footage stutters when played from the timeline
2. Some of it also stutters from external players
3. some of it stutters less when played from your lowly netbook than it does on your more powerful edit station.
So your problems could be system hardware, OS and software environment, or Vegas itself.
The first thing to consider is that Vegas is claiming to play back your media at full frame rate. That's either correct or incorrect. I suppose it's possible that Vegas is missing these skips. It's also possible that the skip happens after Vegas detects the framerate, which it must be checking at regular intervals. How often does Vegas check? Presumably not so often that it interferes with playback, so yes it might be missing it. (I don't know how this really works, in Actionscript I'd be making the check at regular intervals)
We all know that playback from the Vegas timeline involves extra overhead so it's entirely possible, even probable, that payback would miss a beat here and there. We also know that the OS environment always has things going on. Services are running, hardware is being managed, page file activity happens, network interfaces get polled. Still, Vegas should be able to get its playback to be a solid as other applications. If they can do it on the same machine then Vegas needs to meet that standard.
It seems the most common hardware conflict for Vegas is with sound cards and ASIO drivers. I assume you've looked at that.
One thing that puzzles me is that (I think) you've been saying you get stutters from uncompressed AVI media when there are things like pans in the file. That shouldn't make a difference in uncompressed media and it makes me wonder if the problem is actually between your display card and display? Problems like this are more indicative of compressed media performance problems. As John Meyer suggested, I wonder if a mismatch between your frame rate and display refresh rate might have something to do with this. It wouldn't need to be much but if the display card needed to drop frames periodically this could be related.
Rob Mack
So far it sounds like no codec is giving you stutter free playback from the timeline. Your epic journey is getting a bit to long to keep track of but the short of it seems to me to be that:
1. all footage stutters when played from the timeline
2. Some of it also stutters from external players
3. some of it stutters less when played from your lowly netbook than it does on your more powerful edit station.
So your problems could be system hardware, OS and software environment, or Vegas itself.
The first thing to consider is that Vegas is claiming to play back your media at full frame rate. That's either correct or incorrect. I suppose it's possible that Vegas is missing these skips. It's also possible that the skip happens after Vegas detects the framerate, which it must be checking at regular intervals. How often does Vegas check? Presumably not so often that it interferes with playback, so yes it might be missing it. (I don't know how this really works, in Actionscript I'd be making the check at regular intervals)
We all know that playback from the Vegas timeline involves extra overhead so it's entirely possible, even probable, that payback would miss a beat here and there. We also know that the OS environment always has things going on. Services are running, hardware is being managed, page file activity happens, network interfaces get polled. Still, Vegas should be able to get its playback to be a solid as other applications. If they can do it on the same machine then Vegas needs to meet that standard.
It seems the most common hardware conflict for Vegas is with sound cards and ASIO drivers. I assume you've looked at that.
One thing that puzzles me is that (I think) you've been saying you get stutters from uncompressed AVI media when there are things like pans in the file. That shouldn't make a difference in uncompressed media and it makes me wonder if the problem is actually between your display card and display? Problems like this are more indicative of compressed media performance problems. As John Meyer suggested, I wonder if a mismatch between your frame rate and display refresh rate might have something to do with this. It wouldn't need to be much but if the display card needed to drop frames periodically this could be related.
Rob Mack
Laurence
wrote on 2/9/2010, 11:33 AM
What he said. Uncompressed shouldn't care if there are pans or not as every pixel is completely independently defined. Are you sure there isn't some sort of compression in there (even a lossless one)? I get similar performance problems to the ones you are mentioning for instance if I use Quicktime PNG (which is identical to uncompressed quality wise, but none the less data compressed).