are there any differences in manufactors of DVD+R or DVD-Rs?

Definitely. There are also differences between DVD+R's and DVD-R's even when you're dealing with the same manufacturer. (Heck, depending on when you buy them, there can be differences between the same type of media from the same brand, since brands sometimes change manufacturers, or manufactures change suppliers. There's just a lot of variances, and not so much standardization when it comes to recordable DVD's.

What does hollywood use for there's?

Commercial DVDs are pressed. The data is saved onto a disc by creating pits in solid material. DVD-R's and DVD+R's, however, use ink instead of solid material. DVD players were originally designed to work with pressed DVDs, and so pressed DVDs play more reliably.

All of that said, generally the difference between differnt types (+/-R or +/-RW) manifests itself by a player not being able to read the disc at all. If the player can read the disc, but playback is sketchy, you may have some other problem. (Not that I'd outrule the compatibility issue.)

The DVD content itself might be an issue. How long is the video and what bitrate did you use? Bitrates between 3Mb/sec and 7Mb/sec seem to perform the most reliably. In the area of 8Mb/sec and 9Mb/sec, some DVD players have a hard time keeping up.

As for burning speed, slower burns do lead to fewer errors, but I don't think 2x is unreasonable.

Rob

Verbatim disc's are rated to be among the best. I only use Verbatim. As bStro says, don't use bitrate over 7MB/sec as some DVD players get playback issues if you go higher.

Wow thanks Rob!
You answered alot of questions.
The DVD is 47 min long. I just check my file on this project and the bit rate was set to default at 8 mb. I'll try lowering this to see if it helps.
Will the quaility of the picture lower if I lower the bit rate?
Forgive me if this is elementry question but I'm very new to this.
Thanks again,
Adam

>>>Verbatim disc's are rated to be among the best.<<<

Verbatim is a brand; the company does not manufacture their own blank DVD media.

Having said that, Verbatim disks ARE good PROVIDED they're made by the likes of Mitsubishi Chemical Corp (MCC), Taiyo Yuden, Ritek, or Ricoh. Some, however, are manufactured by CMC Magnetics and are, pretty much universally, regarded as being of considerably lower quality. The Media ID will reveal the actual manufacturer of the disk.

I did a project earlier this year with Memorex DVD + and - disks. Horrible results. About one in 5 were returned as unplayable. Aside from the number of finger prints on some of the disks it was a combination of disk type and bit rate.

Redid the project at a lower bit rate and used ritek disks only one of the people with a problem was not resolved. I suspect that that player just did not like DVD Rs. I forget the brand but she had three of the same players and the disk would not play on either.

I have run into problems with some DVD+R recordings when I had the bit rate up too high ( Greater than 8 Mbps).

Some DVD players can't handle anything higher than 8 Mbps.

What Bit rate did you use?