Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > Video Encoding > MPEG-4 ASP

Reply
 
Thread Tools Search this Thread Display Modes
Old 26th September 2021, 09:58   #1  |  Link
orion44
None
 
orion44's Avatar
 
Join Date: Jul 2007
Location: The Background
Posts: 248
In xvid_encraw, do I need to specify bitrate in the first pass?

Just discovered that there is a command line version of Xvid codec when I looked into the Xvid folder.

When doing a two-pass encoding with xvid_encraw, do I need to specify bitrate in the first pass,
since in vfw version it is disabled in the first pass?

Why is imin, pmin, and bmin set to 2 by default, when in vfw version it is set to 1?
I would like to change this setting to 1.
orion44 is offline   Reply With Quote
Old 27th September 2021, 01:45   #2  |  Link
Asmodian
Registered User
 
Join Date: Feb 2002
Location: San Jose, California
Posts: 4,298
If I remember correctly, yes you need to specify the bitrate for the first pass. It does try to do some rate control for first pass. This is why three pass offers some very slight improvements; the bitrate for the second pass is a much closer to the target so the data is more accurate for the third pass.

The minimum QPs set to 2 instead of 1 usually results in smaller files without quality loss because QP 1 is extra huge. However, people got annoyed when Xvid didn't hit their bitrate targets so some tools default to a min QP of 1. If you want extra size without a significant quality boost feel free to lower the min to 1.
__________________
madVR options explained
Asmodian is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 19:19.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.