dv transfer problems on LP tape

[PietrAhead]

Hi
i would like to know if is there someone who could help me with this problem i have.
i use a pentium III / 512 ram ibm thinkpad with ulead video studio 8 to transfer my dv videos with no problem at all until one of this days that i tryied to transfer a dv tape recorded in LP by the same process.
the sound is choppy and i cant figure out why this happens.
i've been looking in this forum and all over the internet for a solution and have tryied almost everything to solve it, like installing new freeware programs and trying new settings on the capture method.

Thanks in advance

[guns1inger]

Does it play back OK when you watch it on the TV or in-camera ?

[MpegEncoder]

Does it play back OK when you watch it on the TV or in-camera ?

Exactly, because there is nothing else different about DV transfer of LP tapes.

[PietrAhead]

Yes, in spite of some pixelization time to time the video plays well on camera and in tv viewing with no sound problems.
the diferences between the videos (dozens) that i tranfered sucessfully before and this one is that this dv tape was recorded on another camera than mine and in LP mode.
I've been trying this for almost a week and i'm getting full of it.....

thanks for you concern guys.

[guns1inger]

The biggest difference between standard play and long play recording is how densly they pack the data on the tape, and a reduction in error correction/checking. This means that LP recording of DV can suffer similar problems to LP recording on VHS - it plays back best on the machine that recorded it, and is hit and miss on other playback devices. If you can, try to get hold of the recording camera.

[PietrAhead]

Thanx guns, i'll try that and i'll be back for report.

[PietrAhead]

No! The problem subsists. the recording camera plays the dv tape the same way my camera does it and in the dv transfer, the sound is still choppy. Is it a sound processing problem? i don't think so 'cause the capturing of a dv tape is just like a data transfer... the funny thing is that all the other tapes transfer with great results except this one on LP mode.

Still needing help

[Richard_G]

Does this not tell you something about LP mode? Don't ever use it. Sometimes, and only sometimes, if you use the camcorder that recorded the tape and run a head cleaner through it before trying to transfer, it may work.

If it doesn't, you may have to capture the analogue stream and edit out the glitches. The fact that it plays the same through TV shows that the glitches may even have happened during the recording and nothing you can do will get rid of them.

LP is like 12 bit (32kHz) sampled audio. It should be permanently disabled on all camcorders.

[slacker]

I agree with Richard_G. I have read over and over again on the many, many DV forums out there that...

1. Stick with SP mode at all times
2. Stick with ONE tape brand at all times if possible
3. Clean your heads regularly
4. BEWARE, Canon & Sony have 'read' problems with JVC & Panny
5. BEWARE, JVC & Panny have 'read' problems with Canon & Sony

[PietrAhead]

No guys
You misunderstood me
the tape plays well on my camera, and through the tv as on the recording camera.
the problem is that after the transfer the sound gets choppy, both with my camera and the recording camera.
is the LP mode more demanding of transfer programs?
perhaps i should record it to VHS and then record it back to DV in SP mode and THEN do tthe transfer. It will loose quality a lot, but the DVD will be made!
There is something I am: Persistent.
I still wonder if there is around someone who got the same problem doing a simple transfer... I don't see any logic in this... LP, SP...
HELP (LOL)

[MpegEncoder]

is the LP mode more demanding of transfer programs?

No, the ONLY difference between LP and SP is the spacing on the TAPE.

Nothing else.

[Richard_G]

LP mode in itself isn't more demanding on transfer programs but the quality of the data stream is. When you play back to your TV, the odd missing bit in the data stream isn't going to be noticable to you viewing it. It will be very noticable to the transfer software. As LP mode records the tracks on the tape closer together, it is more prone to errors, particularly if the tape isn't top quality or the heads are slightly dirty.

It's much the same as errors on a DVD disc, the odd scratch may cause a slight hiccup while you are playing it back, but you will have great difficulty ripping it to hard drive because the software is expecting an error free data stream.

[MpegEncoder]

LP mode in itself isn't more demanding on transfer programs but the quality of the data stream is. When you play back to your TV, the odd missing bit in the data stream isn't going to be noticable to you viewing it. It will be very noticable to the transfer software. As LP mode records the tracks on the tape closer together, it is more prone to errors, particularly if the tape isn't top quality or the heads are slightly dirty.

It's much the same as errors on a DVD disc, the odd scratch may cause a slight hiccup while you are playing it back, but you will have great difficulty ripping it to hard drive because the software is expecting an error free data stream.

The transfer program does not examine the stream, it just packages it into the file system. The only thing that it can "detect" are missing frames. That's because it expects data and there is none.

If the video or audio data is corrupted (from the source), then the only way that you will know this is when you watch it.

[edDV]

Freiends don't let friends use LP mode.

After a few years of transport wear, LP may not even play on the same camcorder that recorded it.

6mm track spacing increases tracking problems and RF noise both of which conspire to increase digital data recovery errors. The DV camcorders have good error correction but there is a limit to how much data guessing they can do. Dirty heads create similar issues. When the dirty heads are on the edge, you see the error correction desperately trying to interpolate missing data and audio/video goes pixelated and shaky just before failing completely.

Best probability of recovery success will be playback from the same camcorder that did the original LP recording. Also, clean the heads with white tape.