Quality

Jengu-Kun · Post by **Jengu-Kun** » Tue Oct 17, 2006 4:06 am

When converting my uncompressed file to either DivX or Xvid in VirtualDub, it tends to low the color/image quality.

Is there anyway I can stop this from happening?

Moonie · Post by **Moonie** » Tue Oct 17, 2006 5:32 am

Try adjusting the bitrate of divx and xvid to see if it improves the quality.

Willen · Post by **Willen** » Tue Oct 17, 2006 5:49 am

You may be seeing the effects of colorspace conversions.

By scripting all your filters in AVISynth you can avoid many color conversions. The optimal scenario involves only 2 colorspace conversions: MPEG2 from DVD in YV12, processed with Avisynth in YV12 and then converted to RGB32 ready for editing. RGB export form editing program using Huffyuv in RGB mode and then converted to YV12 ready for the final video compressor. By doing this you not only save time but also quality by avoiding colorspace conversions.

Many people once used YUY2 mode in HuffYUV all the time thinking it was lossless - so they would import into Premiere, edit, export to YUY2, import again, edit, export again and each time it went into Premiere it was being converted into RGB and each time it was compressed to HuffYUV it was being converted to YUY2. This has lead to many faded-looking videos in the past.

Jengu-Kun · Post by **Jengu-Kun** » Tue Oct 17, 2006 6:38 am

I increased the bitrate and the file size is a bit too big.

When converting it displayed the output for audio as 25meg, is that normal? and is there a way I could decrease it?

Moonie · Post by **Moonie** » Tue Oct 17, 2006 6:56 am

Jengu-Kun wrote:I increased the bitrate and the file size is a bit too big.

When converting it displayed the output for audio as 25meg, is that normal? and is there a way I could decrease it?

Convert your audio to mp3 that will make it smaller.

You also should try Willen's advise, it could have something to do with the colorspace thats effecting the quality

Jengu-Kun · Post by **Jengu-Kun** » Tue Oct 17, 2006 11:54 am

I don't quite understand what Willen quoted.

Minion · Post by **Minion** » Tue Oct 17, 2006 11:55 am

is this uncompressed for the final encode of an amv?
or is it uncompressed source footage that you plan to edit with

if it's the later, encode it in lagarith instead

Jengu-Kun · Post by **Jengu-Kun** » Tue Oct 17, 2006 11:58 am

Sorry for not mention, but It's a finished AMV that's already been edited.

I'll try Lagarith, thanks.

Minion · Post by **Minion** » Tue Oct 17, 2006 12:01 pm

no, lagarith for source
xvid for finished amv

Jengu-Kun · Post by **Jengu-Kun** » Tue Oct 17, 2006 12:02 pm

Minion wrote:no, lagarith for source
xvid for finished amv

Sorry i'm completely lost here, source?