Best Way to Join 2 AVIs @ Different Resolution?

[DoctorStopMo]

Apologies if there are FAQs about this very topic, but I did a quick check and it seemed like a prerequisite for most of them was that the files have the same resolution.

If they don't have the same resolution, what is the best way to join them together? I tried using AVIMux, but it won't do it.

Thanks in advance! Help is much appreciated.

[mats.hogberg]

You can't. One of the AVIs have to be reencoded to the same res as the other.
To boot, they must share the same codecs (A & V) and bitrates.

Why are you joining? Are you going to process the AVI further after joining?

/Mats

[guns1inger]

You might find a real editing package will allow you to load up different sources and produce a new file better than just a joiner (which are often simple beasts). You may also find that this becomes a bigger headache if you have formats such as AC3 to deal with though.

[mats.hogberg]

This suggestion equals "reencode both clips to the same specs and join them", which might be the best solution in this situation.

/Mats

[guns1inger]

true

[DoctorStopMo]

You can't. One of the AVIs have to be reencoded to the same res as the other.
To boot, they must share the same codecs (A & V) and bitrates.

Why are you joining? Are you going to process the AVI further after joining?

/Mats

Thanks both for your help. Yes, I plan to edit further once they are joined. It is for a school project, and one of the groups working on it sbumitted a different resolution than the other group, and it's too late to redo the entire thing. In fairness, we were working with size constraints, so one group had a lot more to fit into a given file size; ergo, they went with lower resolution. Is there a tut about how to re-encode the entire film at a new resolution with VirtualDub or something? Sorry for all the questions, I'm just really lost

[guns1inger]

If you plan to edit and have an editor, do it all in there so you only have to reencode at the end of the process. If you try to join first then at least one clip will have to be re-encoded an extra time, cause a possible quality drop which will be even more niticable as it will happen halfway through.

If you must join first, get the sepc of the highest quality half (file information in vdub will tell you this) then load up the other file and output it with matching specs. You can then join them.

[DoctorStopMo]

Thanks for the advice, but there was a new complication introduced once I recompiled the video at new resolution: there was a delay in the sound. How do I go about fixing this?

If I join the two together, the sound is fine for the first half, and then terribly off (maybe as much as 8 seconds) for the second half. Any way I can avoid the sound delay in when I change the resolution of the movie? Help would be appreciated as the deadline for the project is approaching.

Thanks in advance .