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| chrome307 |
| Posted: Sep 7 2002, 02:19 PM |
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Hi there, I am told that HuffyUV is a lossless codec and can capture all frames.......but I'm getting it wrong somehow.
My pc spec is 1.8ghz Athlon cpu, 40GB Seagate Barracuda (7,200rpm), 512 DDR Ram, GeForce 2 200MX 64Mb DDR Ram and TView99 capture card.
When I use HuffyUV as the compression codec it drops 2 frames per 10 minutes, Microsoft MPeg4 v2 drops 3 per 10 minutes. Hence I use Mpeg4 v2 as the files dropped aren't so bad and the file sizes are way smaller.
What are the correct settings for HuffyUV, so I don't drop any frames??
By the way my HDD is unchecked for DMA as I when I checked it to perform write tests it performed better.
Any ideas guys??
chrome ;0) |
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| SillKotscha |
| Posted: Sep 7 2002, 03:25 PM |
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smart Moderator
Group: Moderators
Posts: 146
Member No.: 6
Joined: 7-July 02
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monsieur,
first you should stick (in any case) to DMA - PIO_mode sucks!! Then check if your colorspace (data format) is set to yuy2 (or_that depends on your device: UYVY) and then have a closer look to your format (e.g. 720x540 for FullPAL_TV-cropping/ overscan is somehow omit). Afterwards you should try out which audio compression suits you best: 44,1kHz - 16bit stereo is recommended but keep in mind that some sound_devices work best with audio_compression set to 48kHz.
If these settings are as told, then we can start to capture... bare in mind, that a modified version of vdub may suit your needs...Capture FAQ_What can I do against "Dropped Frames"?... have a look for yourselve here
Ok, if all these settings are already done, then start to capture for about 1/2 min... and then stop it!!! Restart your settings and then start your recording for a second try --- this will make sure, that your HD (partition) is capable for such a big amount of data.
cheers Sill
P.S.: it's 5 pm in the eve and I'm totaly drunk!! So, if you think that some advices are totaly crap then do not follow them...
with kind regards Sill
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"Have you ever noticed that whenever Microsoft calls something 'Smart', it's definitely a feature you want to disable!" |
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| chrome307 |
| Posted: Sep 7 2002, 04:27 PM |
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Thanks for the speedy reply !!!
Enjoy yourself.......it's the weekend!! 
chrome |
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| Newstech |
| Posted: Sep 17 2002, 11:14 AM |
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| QUOTE (chrome307 @ Sep 7 2002, 08:19 AM) | Hi there, I am told that HuffyUV is a lossless codec and can capture all frames.......but I'm getting it wrong somehow.
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Something that should have been mentioned here ...
"Lossless" refers to whether any information is dropped from within frames during the compression process. There's no guarantee that your machine will be fast enough to capture all the frames that are generated. |
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| bobsobol |
| Posted: Sep 17 2002, 08:55 PM |
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| QUOTE (chrome307 @ Sep 7 2002, 08:19 AM) | By the way my HDD is unchecked for DMA as I when I checked it to perform write tests it performed better.
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Hmm, I've not seen the DMA check box since 98, but I've not used ME. DMA is always preferable, and is always enabled on 2K/XP. Better because the CPU dosn't sit in a hung state till the write has finnished. This is pretty quick from a human perspective, usually about 200ms but 200ms would be a heck of a wait for a 1.8Gig Athelon.
I have used HuffYUV to succesfully capture 384x288x25fps even on my P166 in Win98, but I don't recomend this OS for such a processor as yours, and am frankly a little suprised if this is your choice.
Also look a the File System you are writing to, don't capture to FAT file systems unless you really have to, they place to high a burden on the CPU and (officially) can't support more than 4Gb in a file. So say you capture a 2Hr film at the res I mentioned above, uncompressed YUV9 is 18Gig, even HuffYUV will make it about 10Gig so you'll need to capture about 4 segments. I have heard of ATI software that breaks the 4Gig boundery but I have no idea how.
Also look at the size of your clusters/blocks in the filesystem. The OS usually chooses this for you but a tool like Partition magic will allow you to chose at the time of formatting. Large blocks are better with DMA enabled, you only need to send a DMA call infrequently to write out a 4Meg say, small blocks are better without as the processor has to wait each time a block is written. (at least that's how I understood it) I spend more time optimising my filesystems and drive IO than anything else in Win98 on that old 166. Largest FAT block size I could get yealded the best results, but I couldn't get around the 4Gb limit, except for Stripe files.
The other major tip. I recomend more highly than anything else, Video capture should be done on a system with AT LEAST TWO hard disks! Even if one is just an old 1Giger. Place them on seperate channels (ie Primary/Secondary) and get windows to keep it's Swap File on one other than the one you are capturing to. If you know enough about your OS to get it to keep other forms of Temporary files to that drive (or preferably a third, on a third/Terciary IDE chain or SCSI, but that is probably overkill these days) then do that.  |
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