Noise gets distorted

Faltzer · Post by **Faltzer** » Tue Jul 15, 2008 4:37 pm

Ok, I've exported the video from Premiere as a un-compressed AVI file and then I use VirtualDub to encode the video to h.264 AVI as it's a raw file, the video has noise(as a effect), however when I re-encode it with VD the noise get's distorted and the video looks messed, any help?

leahzero · Post by **leahzero** » Tue Jul 15, 2008 5:30 pm

You shouldn't encode h.264 to AVI, it causes various issues. h.264-encoded video should go into MP4s or MKVs etc.

That could be causing your problems, or more likely, you did not encode losslessly, so each time you reencode the file you're introducing more artifacts into the footage and progressively degrading it.

Use a compressed lossless codec like Lagarith or FFV1 for all of your intermediate renders except for the final one that you're going to compress for distribution.

PsyCLown89 · Post by **PsyCLown89** » Wed Jul 16, 2008 6:35 am

Isnt uncopressed also lossless?

What I think he did was use the original video files inside Premiere then export it as an uncompressed video then from there re-encode it to an H264 file from the uncompressed file...

So basically he just re-encoded from the original videos to uncompressed then from uncompressed to H264

BasharOfTheAges · Post by **BasharOfTheAges** » Wed Jul 16, 2008 6:47 pm

I think there may be confusion in that the OP claims to have encoded to h.264 in Vdub... which I don't believe you can do. Could be wrong though.

kenzuka · Post by **kenzuka** » Thu Jul 17, 2008 1:46 am

Well, I do not know about the h264, but it is possible to encode x264 with VD because the vfw (Video For Windows) version of x264 exists but it is not really well known. You can have it here for example:

http://gabextreme.googlepages.com/x264vfwunited
http://sourceforge.net/projects/x264vfw/

Well, You generally have it with some big codec pack like the K-Lite full.

For your problem Faltzer, what is your project configuration and your encode configuration?

Faltzer · Post by **Faltzer** » Fri Aug 01, 2008 5:10 pm

The video is exported as an uncompressed AVI file from Premiere, once it’s exported it’s around 10GB or so for about 4~5 minutes of video. Normally I would use VDub to do a AVI h.264 two-pass and the video would be compressed (audio and video) to about 50MB or so, but now when I do that, scenes that have noise gets distorted and it makes the scene look smudged-like and you can’t really notice the noise.

mirkosp · Post by **mirkosp** » Fri Aug 01, 2008 5:28 pm

Have you tried checking if it was an export error on Premiere's side? Shouldn't be happening with Uncompressed (which is what you're using), but Premiere generally throws nasty garbage on huffyuv and lagarith exports.
Also, if the export is fine, try to compress your vid to xvid and check out if you still have your problem. If it's fine, than it's a problem of the vfw version of the x264 encoder... just use the zarxgui to encode an .mp4 with a h264 video stream, it will be better.
Oh, another thing: what's your resolution? I'm asking this cause codecs might have problems with encoding non mod16 resolutions... h264 is more efficient if res is mod16 etc.