3.0 Mbs Vs. 8.0 Mbs 24p DVD

Colione

Colione

Active member
I am in the midst of putting a short I did onto a DVD. For the actors commentary, I have two streams, the one of them talking and the film itself. I had to compress it at a lower rate I did for the main version of the film to fit these two sequences in one track. For the main version of the film I encoded a variable bitrate m2v file average 7.0 Mbs and max 8.0 Mbs.

For the commentary version I encoded it again, but at a constant bitrate of 3.0 Mbs.

I just finished watching both versions on a friends nice big sony TV, and we both found the lower bitrate (CBR 3.0) to have a better 'look'.

I would assume that the higher bitrate would look better, what we find, is that the film looks a touch softer, and there seems to be less noise on backgrounds. Also, that feature films are probably encoded at a fairly low bitrate due to their length, so this may give the DVD a more 'film DVD' look, having a lower bitrate.

Has anyone else found this to be true? If so, or not, what are your thoughts?
 
Re: 3.0 Mbs Vs. 8.0 Mbs 24p DVD

First -- You only needed to encode the audio again. DVDs will play a second track of audio over the movie if you want it to.

Next - for me, 7 is a bit high. I don't like how 'sharp' it looks. 5-6.5 or the 90 minute preset is good for me. I've got a nice big Sony that I like to check things out on too and the way the screen draws those high bit encodes is really gross.

Keep the encoding to 5-6.5 and I think you'll be happy.

What dvd program are you using?

CaptM
 
Re: 3.0 Mbs Vs. 8.0 Mbs 24p DVD

CaptainMench,

I actually have two streams of audio for the main video track, the one that's encoded at a high bitrate.

And for the other track, I have two streams of video. I wasn't able to stack two streams of video, and three steams of audio, so I separated it into two different tracks.

and I also made a mistake in the post above. I am actually comparing a constant bitrate of 6.0 vs. a constant bitrate of 3.0.

Still found the 3.0 to have a better look.
I'm using DVDSP2
 
Re: 3.0 Mbs Vs. 8.0 Mbs 24p DVD

Ah -- interesting.

At this point I guess I say beauty is in the eye of the beholder.

It also depends on what the images are that are being encoded... I guess. I'm at a loss.

CaptM
 
Re: 3.0 Mbs Vs. 8.0 Mbs 24p DVD

Cpatain,

For the lower bitrate, I could tell there was less information. But just somehow it looked a little more film like, less sharp, and the colors looked slightly more film.

I don't know, it was only one one TV .... soooo..I should prolly check it again somewhere else. ;)
 
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