Bizarre compression problem

kearlywi · Post by **kearlywi** » Thu Apr 10, 2003 10:29 pm

Another day another bug. This one is really strange. A while ago i took some outlaw star episodes on Dvd and converted em to avi's using the tempenc compressor, which later i found sucked. So naturallly Ive been using Vdub to further compress the AVI's that TMPGEnc produced. Everything ran smoothly for the first 5 episodes. Then on every episode after #5 i kept getting a msg from my computer saying my virtual memory was low.

Naturally the process was halted and the files spit out by virtual dub were corrupted. I freed a ton of virtual memory by clearing off an additional 5 gigs of hard drive space (my master harddrive is 20 gigs total). I then restarted my computer and made sure all extraneous applications were closed. I ran virtual dub and sure enough my computer once again told me i was out of virtual memory (at the same exact frame to boot).

Once again I would like to emphasize that the first 5 episodes used the same exact compressors and had the same exact settings and both the imported and final files were almost exactly the same size as the respective files that shorted out my computers virtual memory. In other words I made no changes that could have caused complications.

I am using a DivX 5.0.3 video compressor and a Lame MP3 audio compressor. These compressors ran without a hitch with the first 5 episodes.

trythil · Post by **trythil** » Thu Apr 10, 2003 11:00 pm

kearlywi wrote:Another day another bug. This one is really strange. A while ago i took some outlaw star episodes on Dvd and converted em to avi's using the tempenc compressor, which later i found sucked. So naturallly Ive been using Vdub to further compress the AVI's that TMPGEnc produced. Everything ran smoothly for the first 5 episodes. Then on every episode after #5 i kept getting a msg from my computer saying my virtual memory was low.

Naturally the process was halted and the files spit out by virtual dub were corrupted. I freed a ton of virtual memory by clearing off an additional 5 gigs of hard drive space (my master harddrive is 20 gigs total). I then restarted my computer and made sure all extraneous applications were closed. I ran virtual dub and sure enough my computer once again told me i was out of virtual memory (at the same exact frame to boot).

Once again I would like to emphasize that the first 5 episodes used the same exact compressors and had the same exact settings and both the imported and final files were almost exactly the same size as the respective files that shorted out my computers virtual memory. In other words I made no changes that could have caused complications.

I am using a DivX 5.0.3 video compressor and a Lame MP3 audio compressor. These compressors ran without a hitch with the first 5 episodes.

(1) TMPGEnc is an MPEG 1/2 encoder. It does not produce AVIs; it produces MPEG elementary and system streams.

(2) Lossy compression on a lossy-compressed file does very funny, unpredictable things, and I don't mean with memory. I'm referring to the fact that you're throwing out data from a source that has already undergone significant information reduction, and that does very, very ugly things to video. (Or anything, for that matter.)

(3) If, for some crazy reason, you still want to do this, try splitting up the original MPEG stream into two, and then recombining -- MPEG makes it easy to do such a thing.

kearlywi · Post by **kearlywi** » Fri Apr 11, 2003 1:45 am

As far as the 3rd option is concerned that is definitely do-able. I found out that the problem is limited to my divx 5.0.3 codec. (the divx mpeg4 codec finishes the file just fine [altho its 50 megs bigger than the 5.0.3 codec's equivalent file])

Im gonna try using Xvid, real media, and 5.0.3 again (after deleting and redownloading it). Ill repost If i find a nice compressor that gets around this problem. By successfully compressing the file with another compressor Ive determined that the problem somehow lies in the DivX 5.0.3 compressor and not the file itself despite being encoded thru the crappy TMPGEnc.

If anyone has had the aforementioned (previous post) symtoms with DivX in Virtual Dub plz dont be afraid to post, I still have a long way to go before this problem is solved.

trythil · Post by **trythil** » Fri Apr 11, 2003 1:54 am

kearlywi wrote:As far as the 3rd option is concerned that is definitely do-able. I found out that the problem is limited to my divx 5.0.3 codec. (the divx mpeg4 codec finishes the file just fine [altho its 50 megs bigger than the 5.0.3 codec's equivalent file])

Im gonna try using Xvid, real media, and 5.0.3 again (after deleting and redownloading it). Ill repost If i find a nice compressor that gets around this problem. By successfully compressing the file with another compressor Ive determined that the problem somehow lies in the DivX 5.0.3 compressor and not the file itself despite being encoded thru the crappy TMPGEnc.

If anyone has had the aforementioned (previous post) symtoms with DivX in Virtual Dub plz dont be afraid to post, I still have a long way to go before this problem is solved.

They weren't all options -- they were corrections. Pieces of advice. I'm still very confused on why you're doing MPEG-2 -> MPEG-1 / MPEG-2 -> DivX in the first place when you could just as well do MPEG-2 -> DivX.

kearlywi · Post by **kearlywi** » Fri Apr 11, 2003 3:43 am

I found Xvid to be a very nice compressor, it does not have the problems that DivX 5.0.3 had. Xvid is mpeg4 format and i dont know much about the differences in formats but I do know that Xvid works great. I recommend it to all those noobs out there who dont know Avi from Mpegs like I once did.

Thats all folks problem solved.

Ashyukun · Post by **Ashyukun** » Fri Apr 11, 2003 7:16 am

I can't quite tell if you're really getting what trythil is trying to say- I think most of the time when we refer to DivX it's in the inclusive form, meaning DivX/XviD, since the two are (or at least were) related. You are likely to get far better both quality and compression if you only compress once- from the original source. As he said, compressing an already lossy file with yet another lossy format is just going to degrade the picture quality. MPEG and DivX/XviD are all lossy formats. Admittedly, even the DVD source is lossy from the original images/source, but it is the best source 99.9% of us will ever get our hands on (until a better format comes out). So, to get the best quality, compression (quality -does- play into compression- a noisy file will not compress as well as a clean one), and avoid weird things happening as much as possible, just do one compression from the DVD source...

NicholasDWolfwood · Post by **NicholasDWolfwood** » Fri Apr 11, 2003 2:36 pm

trythil wrote:
kearlywi wrote:Another day another bug. This one is really strange. A while ago i took some outlaw star episodes on Dvd and converted em to avi's using the tempenc compressor, which later i found sucked. So naturallly Ive been using Vdub to further compress the AVI's that TMPGEnc produced. Everything ran smoothly for the first 5 episodes. Then on every episode after #5 i kept getting a msg from my computer saying my virtual memory was low.

Naturally the process was halted and the files spit out by virtual dub were corrupted. I freed a ton of virtual memory by clearing off an additional 5 gigs of hard drive space (my master harddrive is 20 gigs total). I then restarted my computer and made sure all extraneous applications were closed. I ran virtual dub and sure enough my computer once again told me i was out of virtual memory (at the same exact frame to boot).

Once again I would like to emphasize that the first 5 episodes used the same exact compressors and had the same exact settings and both the imported and final files were almost exactly the same size as the respective files that shorted out my computers virtual memory. In other words I made no changes that could have caused complications.

I am using a DivX 5.0.3 video compressor and a Lame MP3 audio compressor. These compressors ran without a hitch with the first 5 episodes.
(1) TMPGEnc is an MPEG 1/2 encoder. It does not produce AVIs; it produces MPEG elementary and system streams.

Correction: It does produce AVI's, which I've done it before, but it doesn't use it's own engine. It uses the same engine that VDub does, so it really doesn't produce them on it's own.

RadicalEd0 · Post by **RadicalEd0** » Fri Apr 11, 2003 4:22 pm

are you guys talking about vfapi or what with these 'avis'

the Black Monarch · Post by **the Black Monarch** » Fri Apr 11, 2003 7:32 pm

kearlywi wrote: that is definitely do-able.

Just like YOUR MOM!

HAR HAR HAR!

kearlywi · Post by **kearlywi** » Sat Apr 12, 2003 7:06 pm

rofl

note to self: never say "do-able" again

AnimeMusicVideos.org

Bizarre compression problem

Bizarre compression problem

Re: Bizarre compression problem

Re: Bizarre compression problem