How to change video bitrate?

[vertical]

Hi,

I am trying to join two DVD movies into one. Every time the second comes as an “Extra” and now I realized that the video streams have different bitrates.

The major one has 4536 while the short one has 6520.

Could you please advise what tool should I use to change bit rate and what bitrate of the two is preferable?

Thank you!

[thecoalman]

What software are you using? If you can depends on the software, better applications allow you to set any bitrate you want. You'll aslo need authoring software that is not going to reeencode it becasue it doesn't fit into it's template.

Ideally you don't want to change either as reencoding decreases quality no matter what. Higher bitrates give you better quality but since your main footage is lower I'd use that.

You could also use software like Ulead DVD Workshop that allows multiple VTS. you can use video with different bitrates but that costs $$$

[kschang]

But why do you need to join them together?

[vertical]

Thank you for your reply.

I do not understand what software you mean - for rencoding? Procoder.

My idea was that I can chenge the bitrate somehow and after that just join them with DVDShrink. Propaply it would be too easy to be true.

Do I understand right that I must reecode one of them and Procoder should do the work. I believe I just need to change bitrate there but it is not an absolute number there. It shows just the highest rate. Really confused.

[guns1inger]

DVD Shrink can't join videos. It can bring content from multiple DVDs together into asingle disc, but they will remain seperate titles in seperate titlesets (VTSs). You do not need to re-encode to do this unless the total size is going to be too large to fit on a single disc, in which case there may be better options.

You could also use Tmpgenc DVD Author and it's add video function to bring in the videos from their different VOB sets, create menus etc, and author for burning.

Without knowing the size of the VOBs in question I can't tell you if they are too big for a single disc, but I can tell you that you do not need to match the bitrates to bring them together on a single disc.

[vertical]

Guns1linger, thank you!

What I am doing is creating a DVD movie from two DVD movies. The second one of the two was created from an avi file. I need them to have a smooth transaction between them as it is actually the same movie.

The size of the final file is OK for one disk. No problem here at all.

Once I did this with DVDShrink – put three title sets (a movie and two commentaries) into a single disc. That’s true - they remain separate titles in separate title sets but when I play the disk I do not feel this. It runs like one big movie. That’s all I need.

I do not understand why now it does not work the same way. DVDShrink puts the second movie into “Extras” folder and the whole thing does not go smoothly. It stops and I need to click "Extras". My guess was because the two have different bitrates.

“you do not need to match the bitrates to bring them together on a single disc.” – If I understood you right I need to reauthor the two into one, right?

A very important issue: will the reauthoring affect the quality of the picture? What would be the best way to keep the quality of the picture?

When you are saying “You can also…”, what do you mean? What other ways exist to do the job?

Thank you!

[SCDVD]

Although there can be good reasons to reduce bit rate (for example to make a video fit where there is limited space on a disc), keep in mind that reducing bit rate is a one way trip. Once bit rate is reduced, quality is lost as well. You can't get the quality back by just increasing the bit rate back to where it was unless you go back to the original source.