Filesize WAY larger than predicted, why?

[FaMiNe]

Just captured and compressed a video yesterday, bitrate calculator said I can use about 950kbps with 96k/s audio for the 84 minute video...

I let it finish compressing (5 hours or so), and I'm stuck with this 2gb file!?

I went back and rechecked the settings, and I really don't know what I did wrong...



I did a lot of editing in Adobe Premiere 6.0, and am using the DivX 5.02 Pro codec, with 1-pass vb

the 1-pass could be the problem, maybe... but I was having some trouble getting 2pass encoding to work in Premiere, I'd always end up with a black video with sound.

So... if anybody could tell me why the filesize is so large, or help me out with 2-pass encoding in Premiere, I'd really appreciate it =P

[khp]

Re: Filesize WAY larger than predicted, why?

Originally posted by FaMiNe
but I was having some trouble getting 2pass encoding to work in Premiere, I'd always end up with a black video with sound.

Sounds like you only did the first pass, with 2-pass encoding you must first use '2-pass first pass' then use '2-pass second pass'.

[FaMiNe]

k, i'll give that a try now... hopefully it'll give me a decent filesize this time...

Does anybody know why the 1-pass gave such a large file though? That's still puzzling me

[Enchanter]

So... if anybody could tell me why the filesize is so large

Have you checked that you are using MP3 for the audio, instead of uncompressed PCM .wav file?

[FaMiNe]

At the time, ,I was leaving the audio in PCM, because Premiere was having a little trouble with the audio compression (I'd just do it later in VirtualDub or something)

Anyway, even after compressing the audio to 96k/s Mono 44.1 kHz (My projected audio type, I also entered this into the calculator)

Anyway, the audio size is negligible to the video size, and since I was shooting for a 700mb file, and got a 2gb file, I'm still as confused as ever.

(One time I did compress the audio, and it came to 1.8 gb or something)

Anyway, I'm still having a whole lot of trouble with this, ,and if anybody can help me solve the file size problem, I'd appreciate it...


I'm starting to think its a Premiere problem or something, nobody else is having file size issues with 5.02?

Please Help!

[Enchanter]

I would recommend disabling any compression while capturing. You are less likely to experience dropped frames. An added bonus is you can process the captured video (+audio) using Virtualdub (whose latest version supports DivX 5 already). You do need heaps of harddisk space though.

[FaMiNe]

The problem with encoding in virtualdub is that I've done quite a bit of editing from the original video in Adobe Premiere, and I'd have to save the movie in the edited version if I wanted to encode in Virtualdub....

I suppose I could do that, but the uncompressed captured video is already taking up about 45gb worth of space, and I'd have to do some weird HDD swapping if I needed another 40 or so to save an uncompressed edited video.

I'd like to find another solution to the problem than that, though if you think this is my only real workable solution, let me know that too...


*update to the problem, although it just causes more questions...
I've compressed the video in DivX 3.11 Low Motion, and it gives me the correct file size, though the video looks really really poor in some areas, despite the semi-standard 950kbps... and it even looks like it drops to something like 5fps in other areas (The source videos dont have this problem). I'd really rather not use 3.11, as 4x and 5x look much better.

Thanks for the help so far, but this is really bothering me.

[Mark Madness]

Heh. Funny that. I always have the opposite problem. I try to make the file 700 MB and it's always 10-50 MB smaller than predicted.