Digital Video Forums  

Go Back   Digital Video Forums > Video File Formats > MP4, MKV, MPEG-4 AVC (H.264)

Reply
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 18 Dec 2007, 05:24 PM   #1
Junior Member
Junior Member
 
Join Date: Dec 2007
Posts: 4
Default Size of H.264 when encoding DVD, MPEG2, MPEG1 into H.264

The x264 should be more efficient than MPEG2 (DVD), therefore it should make about same quality video that takes LESS space when 1 converts MPEG2 (DVD) to MPEG4.

My question is what size, %, or bitrate should I use to get smallest size without losing too much of the original DVDs quality?

Or how to find it.

Should I aim at x% of average original bitrate, size of video?
And at what "x" should I start to get a good compromise.

(for example I set Xvid to 75 quality setting and it does one pass and looks ok to me at much smaller size than MPEG2 DVD)
I am also talking about just the movie size, without menus, extras.
I also don't need to have exact final size.
Sn8kbordin is offline   Reply With Quote
Old 18 Dec 2007, 06:16 PM   #2
Administrator
 
admin's Avatar
 
Join Date: Nov 2001
Posts: 8,627
Default

Welcome to the forum Sn8kbordin. Please don't cross post (post the same thing all over the place - I saw your post on the TVersity forum as well), as that's against the forum rules.

As for your question, I would aim for 2 to 3 Mbps if you truly want to preserve the quality of the DVD (DVDs use MPEG-2, at around 5 to 7 Mbps). This is quite a high bitrate to use, but it will mean that the output is very close to the original even if you watch very close to the TV/monitor - a typical 2 hour movie is than around 2.5 GB.

However, if you don't mind in losing some quality that you won't be able to tell over a few meters anyway, then you can use anywhere between 1 and 1.5 Mbps - 2 CD (1400 MB) DivX encodes, say for a 2 hour movie, will have an average of 1.5 Mbps, but with the more efficient H.264, you can get that down to 1.2 Mbps or even slightly less than that.

But if it were up to me, mainly because H.264 takes so long to encode, I would not use it if all you want is the slight improvement in file size. I would use it to encode a file that is the same size as a DivX/XviD encode, but this file will have better quality.
__________________
Visit Digital Digest and dvdloc8.com, My Blog
admin is offline   Reply With Quote
Old 21 Dec 2007, 06:52 AM   #3
Junior Member
Junior Member
 
Join Date: Dec 2007
Posts: 4
Default

So I can't select just a quality setting and do one pass and have the codec figure out where what bitrate to use?
I have to set average bitrate and do 2 pass encoding?

(in Xvid I can set quality to 75 and it will do one pass encode, and decide by itself when what bitrate to use to keep 75 quality, and that is what I would like to do with x264)
Sn8kbordin is offline   Reply With Quote
Old 21 Dec 2007, 06:59 AM   #4
Junior Member
Junior Member
 
Join Date: Dec 2007
Posts: 4
Default

Also what audio profile do I select if my DVD source does NOT have 5.1 audio, but stereo.
THe guide says to select "NDAAC-LC-MultiChannel-192Kbps" but my source is only stereo.
Sn8kbordin is offline   Reply With Quote
Old 21 Dec 2007, 11:32 AM   #5
Administrator
 
admin's Avatar
 
Join Date: Nov 2001
Posts: 8,627
Default

There is not "quality" slider in x264, but you can use one of the presets to get one pass encoding at set quality levels. I prefer to set an output size instead, since the "quality" setting give you unpredictable output sizes.

If your source is only stereo, use the NDAAC-LC-96Kbps profile (96 Kbps should give you equivalent of at least 128 Kbps VBR MP3, which will be good quality).
admin is offline   Reply With Quote
Old 21 Dec 2007, 04:52 PM   #6
Junior Member
Junior Member
 
Join Date: Dec 2007
Posts: 4
Default

Thanks.
Would one pass encoding have lower quality than 2 pass if the final size would be very similar?

Also, when streaming videos other than h264 thru TVersity I like the ffdshow to postprocess them, but when I have ffdshow resize them they don't play to the end. What I wanted to do was to encode them into h264 with all the post processing. They are VCD MPEG1 or MPEG2 videos.

These are the settings from ffdshow that I am satisfied with:




What Avisynth filters could do that for me?
Sn8kbordin is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
mpeg2 to mpeg1 cyrilsmith Conversion/Encoding 7 20 Jan 2003 11:51 AM
MPEG2 to MPEG1 Pirat Dick General Discussions 2 6 Dec 2002 10:02 PM
mpeg1, mpeg2, avi to dvd video mitsurugi Junior Members/Newbies 1 9 Nov 2002 01:30 AM
MPEG2 vs. MPEG1 drdoug26 Junior Members/Newbies 1 20 May 2002 03:42 PM



All times are GMT +10. The time now is 01:22 PM.

Kirsch designed by Andrew & Austin


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © 1999 - 2018 Digital Digest

Visit DivXLand   Visit dvdloc8.com