the right bit rate

[nojee]

I have a question, when i capture something with my DV camera and i edit it /in premiere or after effects/
when i export the project, what is the correct bitrate, that is smooth, not so big file size, i mean good quality ,looks good on tv /PAL, 4:3/

i ask it becouse premiere offers, 2000 - 6000 kb/sec and i dont know where i should set it
in some cases when i view an exported project on dvd i see stripes on the film, although i used high bitrate
can it also be a problem, if its too high?
so if anyone can tell me what is the right bitrate to use for a dv - dvd project i would appreciate it...

[guns1inger]

The right answer is whatever bitrate is required that you can afford. File size should only be an issue when you are encoding something longer than around 70 minutes. If it is less than that, encode CBR at 8700 kbps for video, then add audio on top. If it is handheld, it will start to look pretty rough the lower you go, and will be awful in most cases once you get do to the 6000 or less level. Under about 7600, consider 2-pass VBR encoding. Premiere does offer higher than 6000, you just have to look.

The stripes are most likely interlacing, and will not be visible on your TV. If they are, you have screwed something up.

The DVD specification says the maximum allowable video bitrate is 9800 kbps, with a maximum combined (video+audio) bitrate of 10080 kbps. Not all players will play back the maximum bitrate from burned DVDs, so it is generally recommended that you back off from the maximum, hence the numbers I used above. Some will recommend lower than what I have specified, although I use those and sometime slightly higher, and have yet to have a playback problem.

[nojee]

thanks for your reply, the stripes are not interlace, i know about that, these stripes are bigger and just shows up once in a while /looks like compression problem or dvd error/, that why i thought maybe i set the bitrate too high so the dvd can not read it and drops frames.

i have another question, what is 2-pass and 1-pass?

[redwudz]

i have another question, what is 2-pass and 1-pass?

Two pass usually applies to Variable Bitrate encoding.(VBR) The first pass for the encoder measures the the 'compressibility' of the video in each scene. Scenes with lots of movement are compressed less, using higher bitrates. Low motion scenes are compressed more, with lower bitrates. The first pass is saved as a 'guide' to set the variable compression (Bitrate) for the second pass. This way each scene gets the amount to bitrate it needs to display the best. Two passes also helps when you need to keep to a set output size.

One pass is more often done at a constant bitrate. (CBR) But if that bitrate is too low for your fast action scenes, you may get blockiness or pixelation. Low action scenes that need less bitrate will have more bitrate than they need for best display. One pass CBR will always have a predictable size, depending on the bitrate set for it. One pass VBR will be similar to two pass VBR but the file size is unpredictable.

[guns1inger]

Compression artifacts are generally blocky, not stripes. Post some images or a short clip of the problem.

Also, badly downsized and deinterlaced video can produce striped artifacts.

[nojee]

thanks for the help, the problem was too high bitrate, 10000kb/sev, now its 6000 and looks smooth.