|
|
| countryboy |
| Posted: Sep 12 2002, 11:45 AM |
 |
|
Unregistered
|
Hi everybody.
I am rather new to VD and Divx encoding.
My problem: frame drop
My specs: P4 1,7G, 256 MB, 60 GB HD, ATi AIW, Sound Blaster 4.1 Digital, Windows XP Professional.
May be anybody knows what is going on. I was capturing from VHS tapes for couple of months with no problems (average 5-6 frames dropped on 45 minutes of a movie, but I know that VHS VCR is a lousy source). Lately I introduced some changes in my system: newest ATi drivers and software (whole package they made available in the beginning of August) dl'd from ATi and SB sound card. I had to go back to previous drivers (and software), because TV app refused to work (anybody knows the reason?). Then I discovered that the frame drop started to grow. That's what I tried to do next:
removed sound card - did not help;
reinstalled driver/software - did not help;
tried to capture directly from TV cable and also using VCR as a tuner (then thru composite connector) - did not help.
The frame drop is still at least 10 times more than before. Normally I capture from VHS in 640 x 480, then encode with Divx 502 with deinterlacing. The result is acceptable, but when I get 15 dropped frames very close to each other, the encoded picture in this place is ugly.
Aybody knows what can be done - before I reinstall the whole stuff one more time?
One more question: what is the meaning of changing numbers described as "jitter" and "disp" in the left lower corner of the window during capture? It sure has a lot to do with my problem, but I do not know the meaning.
I will appreciate any help - Countryboy  |
|
| blakerwry |
| Posted: Sep 13 2002, 01:25 AM |
|
|
Unregistered
|
Really the two reasons to drop frames are: 1) not enough CPU power (time) to capture and encode or 2) not enough bandwidth/speed to transfer the information to your hard drive.
What was your CPU usage before during capture? is it any higher now... if so then you probably have different drivers or something else running in the background that you didn't have before...
You can try changing the priority of the capture application to 'above normal' or 'high' and see if the problem resolves itself...
Also, you will want to defrag your Hard drive... and make sure nothing (other than the capture program) is writing to the HDD while capturing.
|
|
| countryboy |
| Posted: Sep 15 2002, 02:43 PM |
|
|
Unregistered
|
Thanks for your suggestions, blakerwry, but it did not help. But I noticed some interesting suggestions about the reason for the frame drop in my case in othet topic - about the sound cards. This may be the way to solve it - if anyone has the same problem, look into it. |
|
| fccHandler |
| Posted: Sep 16 2002, 01:59 AM |
|
|
Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
Joined: 13-September 02
|
| QUOTE (blakerwry @ Sep 12 2002, 07:25 PM) | Really the two reasons to drop frames are: 1) not enough CPU power (time) to capture and encode or 2) not enough bandwidth/speed to transfer the information to your hard drive.
|
I know a third reason. Under Capture->Timing is a checkbox "Adjust video clock dynamically to match audio clock." Whenever I would check this, I got occasional dropped frames (perhaps one per minute or so), and I later figured out that VirtualDub was dropping frames intentionally, to keep the audio and video in sync. (It talks about this in the help somewhere.) Unchecking the box gives me zero dropped frames, but A/V sync may drift during a really long capture.
--------------------
May the FOURCC be with you... |
|
| countryboy |
| Posted: Sep 18 2002, 09:21 PM |
|
|
Unregistered
|
Problem is solved! The sound card is to blame. If interested, have a look at "What sound card to use" topic. Anyway - thanks. |
|
| dihelson |
 Posted: Nov 15 2002, 05:45 AM |
|
|
Unregistered
|
| QUOTE (blakerwry @ Sep 12 2002, 07:25 PM) | Really the two reasons to drop frames are: 1) not enough CPU power (time) to capture and encode or 2) not enough bandwidth/speed to transfer the information to your hard drive.
|
Sorry Fellow, after many tests, definetelly, No WAY!!
I'm having disastrous dropped frames with my Athlon XP-2000, 512Mb ram HD UDMA4. Even when the usage of CPU is only 50% I get dropped frames, sometimes more than when I encode using 90% !!! What's that ?
I encode directly in Divx.
Indeed, I get dropped frames at almost any resolution, sometimes high resolutions improve the problem.
My HD is fast, and the file for 1 minute is about only 8 to 12 Mb so no problem with HD.
When I put 25fps instead of 30fps I get more dropped frames, I really don't know how to fix this horrible problem and I suspect my Video Card. I read that the source like VHS tapes can produce dropped frames, I'm trying to capture directly from DirecTV.
Any help is welcomed.
|
|
| Tut_Ank |
| Posted: Nov 15 2002, 04:26 PM |
|
|
Unregistered
|
| QUOTE (dihelson @ Nov 14 2002, 11:45 PM) | | QUOTE (blakerwry @ Sep 12 2002, 07:25 PM) | Really the two reasons to drop frames are: 1) not enough CPU power (time) to capture and encode or 2) not enough bandwidth/speed to transfer the information to your hard drive.
|
Sorry Fellow, after many tests, definetelly, No WAY!!
I'm having disastrous dropped frames with my Athlon XP-2000, 512Mb ram HD UDMA4. Even when the usage of CPU is only 50% I get dropped frames, sometimes more than when I encode using 90% !!! What's that ?
I encode directly in Divx.
Indeed, I get dropped frames at almost any resolution, sometimes high resolutions improve the problem.
My HD is fast, and the file for 1 minute is about only 8 to 12 Mb so no problem with HD.
When I put 25fps instead of 30fps I get more dropped frames, I really don't know how to fix this horrible problem and I suspect my Video Card. I read that the source like VHS tapes can produce dropped frames, I'm trying to capture directly from DirecTV.
Any help is welcomed. |
I do share your problem.
I had an Athon 1400 Two 7200 RPM ATA 100 40 GB drives. 256Mb Ram and a bestbuy capture card (848). My captures were great under win 98SE
I Upgraded? to XP pro, and started dropping frames like crazy, so I changed my system to:
Athlon XP 2200+, KT400 Mobo, Two 7200 ATA 1200 80GB drives , 512Mb 333DDR RAM and a Pinnacle PC TV capture card. Still dropping frames like crazy even using real time application priority.
Solution:
I use windows 98SE to capture. and no frames dropped, I use only 15- 20 % of cpu or I even Apply some filters on the fly when capruring (dynamic NR, 2d cleanind, cropping, resizing and compress the video to Huffyuv or Divx.
I use XP pro for post processing, but it seem that with all the cards Ive tried (4 aff them, but all with the bt chip) none of them can so a decent capture on XP. Ill try 2000, when I feel like installing another OS, but until another solution is found, Ill do my captures on 98SE
|
|
| dihelson |
| Posted: Nov 16 2002, 06:46 AM |
|
|
Unregistered
|
| QUOTE (Tut_Ank @ Nov 15 2002, 10:26 AM) | I do share your problem.
I had an Athon 1400 Two 7200 RPM ATA 100 40 GB drives. 256Mb Ram and a bestbuy capture card (848). |
Wow!
May be you indeed have found the solution to my problem also. Thank you very much for your posting, I'll try to install a fresh Win98SE in my computer and try and see.
And what about the NTFS ? I have some partitions in NTFS , as you know FAT32 can't access files greater than 4Gb size, Win98SE can "see" these partitions correctly ? no problem ?
BTW, nice PC you got, ah ???
Tell me, do you use virtualdub for capture right ?
Do you capture directly in Divx ?
What codec do you use ? Divx 5.02 pro ? I tested xVid and found it even better when used with 2000 bitrate, and one of the options activated, I noticed an improvement in color deepness. What codec do you use ?
What resolution do you use ? I use 640X480, if I use 320X240, the videos seem so horrible and small to see on my PC... I'm a newbie and don't know how to use artifacts to improve this...
Do you encode the sound together or you encode it later ?
I use MPEG layer 3 128 stereo 15k to encode, but not in real time, it seems my machine isn't fast enough... dropped frames.
Do you use PCM instead ?
|
|
|
