Coding DV needs more bps than recoding DVD?

[zalop]

Hello,

I use Nero to recode my own 720x576 DV video material to something smaller to archive on hard disk (Nero Mpeg 4). To get a quality where the lines on a blouse don’t give artifacts I need +/- 2.5Kbps. XDIV was a tiny bit better, but I prefer the simple Nero interface.

I was fine with this, but when I recoded a 1200x675 DVD (just to see if I could) it was fine at 700Kbps and great at 1Mbps (Mpeg 4). Even the fast scenes where great!

How can it be that a recoded DVD looks great at 1Mbps, and my own DV without fast moving complex scenes needs 2.5Mbps, just for a blouse?! Using the same program!

Any suggestions?

Regards,
Alex

[Zeppeliner]

the recoded dvd is most likely progressive material, whereas your dv stuff is interlaced, and the latter requires more bits to look good. Also the DV material is likely to be more shaky and noisy and thus furthering the need for more bitrate.

[zalop]

Yes the material is progressive. If I deinterlace it does improve a bit. But I don't want to, because I archive to play back in the future on a normal TV.

Any idea how to improve the bit rate?

[jggimi]

Use a floating head tripod. That will reduce camera shake.

In addition, see:

http://forum.doom9.org/showthread.php?s=&threadid=78071
http://forum.doom9.org/showthread.php?s=&threadid=53190
http://forum.doom9.org/showthread.php?s=&threadid=52386

[communist]

Also DVD movies have scenes with mostly blurred background (no detail) most times only important things are shown with full focus in order to get the viewers attention to those points. Combine this with it being progressive / normally no shaking (except action scenes..) etc.. and you get a whole lot better starting material that will just compress better.

[chilledoutuk]

I archive to play back in the future on a normal TV

Hmm in the future TVs wont be interlaced and i have never seen any problems playing back progresive dvds on interlaced telivisions so i would just deinterlace with something like toms motion compensated deinterlacer.