Why do some burnt dvd's come out blocky?

[Tim1234]

This has just happened to me recently where about 3 out of 10 DVD's came out blocky. I even changed the brand name of the blank disk and it still came out the same. Do you reckon its the movie I am burning? My other burnt movies came out fine. It's wierd.

I use DVD Shrink and Nero to burn. I even did deep alanysis which supposed to improve the quality!

Thanks in advance.

[dlite]

Blocks are normally introduced when the Movie is being too heavily compressed, eg, a dual layer 8 gig movie being reduced to a 4 gig single layer movie.

Why dont you just buy the movies rather than pirating them :mad:

[dvdude]

He could be making backups of his own home movie dvds? :D

[jokiin]

Try slowing down the burn speed, it might sound odd but sometimes this is all it takes to rectify this issue, burn at half the current speed and see how you go.

[damo2010]

Dlite is correct - Its the compression matey. After the analysis is completed, you will notice that the compression rate is 75% (or so) instead of 100%. Two solutions: -

1) Use Dual-Layer Discs. These cost about $8 - $12 a piece. If using this solution, remember to change the "output" preferences from 4.7gb to 8.4gb. This solution ONLY applies if your dvd burner supports burning dual-layer discs and you are willing to spend $8 on dual-layer media.

2) Re-author the discs such that only the Movie is captured. This means no special features, DTS audio, menus, interviews, special features etc. You should be able to fit the whole movie onto a 4.7gb disc. However, if the length of the movie is over 2 hours, you would still need to use a dual-layer disc.

As jok11n notes, rule of thumb (sometimes) - burn at lower speed.

Hope this helps.

[Salamander]

There might be errors on the disc, which when played back, results in inconsistent random streaks and pixels on the screen. You may be able to correct the problem by cleaning the surface if the problem is caused by something smearing the surface and preventing the reading laser from reading.

High compression exhibits the following artefacts:

* Muddy images caused by lower bitrate. Image looks like a heavily compressed jpeg. Objects may start to leave object trails as the motion is no longer as smooth as it should be.
* If the "sharp" option is used, DVDShrink compromises by making the flow of the frames less smooth. Object motion may not be as continuous as it should be.

[termite]

Yep have always found that the original disk quality will show its faults on a PC burn backup, so much for a mirror image of the original.My best results still are achieved by recording with stand-alone recorders at real time DV in\out.