Quantcast Way to Check and See Whether the Extracted Audio is Playing at 25fps? - digitalFAQ.com Forums [Archives]
  #1  
11-23-2003, 02:56 PM
the_ray the_ray is offline
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I got a movie namely X2 which is at 608x256 at 25fps encoded to 352x576 at 25fps..

Q1--Is there a way to check and see whether the extracted audio is playing at 25fps

Q2--I got 2 movies X2 and Daredevil both encoded at 25fps playing way better than any of my 23.976 or 29.976 fps movies..Better as in quality wise(clearness)...

Is the 25fps a factor here or is it the quality of the xvid(avi source) that makes it look good..

Thanks... :P
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  #2  
11-23-2003, 03:07 PM
willy_annand willy_annand is offline
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25 fps is the PAL default.

23.976 or 29.976 fps are the NTSC defaults.

Quality has to do with bitrate and how it was encoded by DivX.

So far from what I have personally seen, DivX is a poorer encoder than MPEG2, only advantage is the smaller size. But I like quality, so I used to make SVCDs, 2 CDs per movie but now with prices dropping, I grabbed a DVD Writer and now use Half-D1 to make double features on one DVD-R
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  #3  
11-23-2003, 03:53 PM
Abond Abond is offline
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@the_ray
Q1 There isn't AFAIK. But i think if the movie is encoded 25 fps it is 100% also with the audio
Q2 dificult to say, but anyway NTSC= Never the same color . I have seen the same with some NTSC->PAL conversions.
@willy_annand
MPEG2 isn't encoder.
Quote:
only advantage is the smaller size
Non-sense. At equal average bitrate(2pass) or constant bitrate mpeg-4 and mpeg-2 give equal file sizes.
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  #4  
11-23-2003, 04:05 PM
willy_annand willy_annand is offline
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Quote:
Originally Posted by Abond
@the_ray
Q1 There isn't AFAIK. But i think if the movie is encoded 25 fps it is 100% also with the audio
Q2 dificult to say, but anyway NTSC= Never the same color . I have seen the same with some NTSC->PAL conversions.
@willy_annand
MPEG2 isn't encoder.
Quote:
only advantage is the smaller size
Non-sense. At equal average bitrate(2pass) or constant bitrate mpeg-4 and mpeg-2 give equal file sizes.
OK, I meant poorer than any MPEG Encoder I have tried... (TMPGEnc, Main Concept, MPEG-VCR, MPEG XS).

Size is a factor....

with DivX, you get a 2 hour movie onto a CD.
with MPEG2 you only get about 45-60 minutes.
With MPEG1 you get 70-80 minutes.
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  #5  
11-23-2003, 04:32 PM
Abond Abond is offline
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Quote:
with DivX, you get a 2 hour movie onto a CD.
with MPEG2 you only get about 45-60 minutes.
With MPEG1 you get 70-80 minutes.
Huh, wery well. Can you tell me the average bitrates? BTW I put 136 (more than 2 hours) movie as MPEG-1 onto a CD as kvcd formate and it beats up any DivX encode quite clear. The most important is - no blocks! At the end XviD simply beats DivX in every point! Do you know what is the difference between them?
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  #6  
11-23-2003, 04:42 PM
willy_annand willy_annand is offline
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Quote:
Originally Posted by Abond
Quote:
with DivX, you get a 2 hour movie onto a CD.
with MPEG2 you only get about 45-60 minutes.
With MPEG1 you get 70-80 minutes.
Huh, wery well. Can you tell me the average bitrates? BTW I put 136 (more than 2 hours) movie as MPEG-1 onto a CD as kvcd formate and it beats up any DivX encode quite clear. The most important is - no blocks! At the end XviD simply beats DivX in every point! Do you know what is the difference between them?
Difference between DivX and XviD... not a clue.

MPEG1 bitrate 1150 kbps
MPEG2 bitrate variable: Max 2500 Ave 2000 Min 1500 kbps

DivX 300-1000 kbps

Given that the quality is primarily in the bitrate, this is why DivX is not as good. Yes, some will argue that the GOP matrix has something to do with quality...

All I know is every now and again I some ripped DivX movies from friends who think they have done a great job with them...

They look like what I can do with MPEG2 and a VHS source. Some much quality loss compared to a good MPEG2 DVD Rip.
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  #7  
11-23-2003, 05:26 PM
Abond Abond is offline
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Well, XviD is backwards written DivX . They both compress the video in mpeg-4 formate. XviD is free codec (GPL), DivX is commercial. XviD produces sharper video (better quality I mean), DivX softer (some people like it more). Currently DivX implement more than two pass, XviD - only two pass AFAIK.
Quote:
MPEG1 bitrate 1150 kbps
Only in standart VCD. MPEG-1 is also DVD compliant stream and there it can go up to 9000 Kbps. I personally make MPEG-1 VBR(variable!) MIN=0, MAX=2500 Kbps for KVCD.
Quote:
MPEG2 bitrate variable: Max 2500 Ave 2000 Min 1500 kbps
DVD are mostly MPEG-2 Max 9000 (I am not very clear with the formate, maybe it is 9700 Kbps)
Quote:
DivX 300-1000 kbps
I have seen DivX encodes in mpeg-4 going up to 2000 Kbps.
Quote:
Yes, some will argue that the GOP matrix has something to do with quality...
GOP and matrix are two different things. Matrices have also DivX and XviD.
Quote:
They look like what I can do with MPEG2 and a VHS source
If you aim for DVD this is quite clear...
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  #8  
11-23-2003, 05:32 PM
Dialhot Dialhot is offline
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Quote:
Originally Posted by willy_annand
MPEG1 bitrate 1150 kbps
MPEG2 bitrate variable: Max 2500 Ave 2000 Min 1500 kbps

DivX 300-1000 kbps

Given that the quality is primarily in the bitrate, this is why DivX is not as good.
Man you are completly wrong in your way of thinking. You are comparing apples and oranges.

Divx is MPEG4, not 2, not 1. MPEG4 always needs less bitrate to provides same informations (compression is better).

That the same in audio for mp2 and mp3. A 112 kbit/s mp3 is the same in quality than a 160 kbit/s mp2.

New codecs (VR6 and WM9) are 5 TIMES less bitrate consuming than MPEG2 (and half than MPEG4). Will you say WM9 is a lesser quality than Divx ? Of course not ! So birate alone doesn't have any sense.
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  #9  
11-23-2003, 05:33 PM
willy_annand willy_annand is offline
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Thanks for the clarification Abond.

Since last April when I bought my DVD Writer I have been doing DVDs exclusively. Registered my own business for it too.

www.muskokacomputes.com

Getting into producing Public Domain Collections now too, will be updating the website to include those this week.
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  #10  
11-23-2003, 05:50 PM
Abond Abond is offline
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Hi, Dialhot
Quote:
New codecs (VR6 and WM9) are 5 TIMES less bitrate consuming than MPEG2 (and half than MPEG4).
If I understand you well VR6 and VM9 don't code in MPEG-4. Do you know by chance which video formate they use to compress?
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  #11  
11-23-2003, 06:52 PM
Dialhot Dialhot is offline
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They use VR6 and WM9
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  #12  
11-23-2003, 07:00 PM
Abond Abond is offline
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Should be a wonder
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  #13  
11-24-2003, 05:51 AM
the_ray the_ray is offline
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my audio is not synched....i extracted the audio(ac3) through virtualdubmod ...fixed it with besliced and converted it to 44.1khz mp2(with heac3he) ...but still not synched ...whr did i go wrong here...


p.s.i used motion estimate search(fast) and not high quality(slow)
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  #14  
11-24-2003, 07:47 AM
the_ray the_ray is offline
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is motion estimate search a problem here becoz this is the 1st time i am using this function
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  #15  
11-24-2003, 08:02 AM
Dialhot Dialhot is offline
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No.
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  #16  
11-24-2003, 10:39 AM
the_ray the_ray is offline
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thankx for the short answer....lol... but whr did i go wrong ...the audio is synched for the avi so did i miss any step here???
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  #17  
11-24-2003, 11:02 AM
Dialhot Dialhot is offline
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I can't answer to that because i do not know what besliced do. Perhaps it kills some samples that it considers as "bad" and so, screw up the later synch with the video.

I never need to use such tools for my ac3 encoding. Virtualdubmod for the extraction, besweet for the encoding in mp2.
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  #18  
11-25-2003, 05:16 AM
the_ray the_ray is offline
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okie..well originally the ac3 i extracted from vdubmod won't work with heac3he saying the last frame is corrupted ...BeSlice fixes this problem....i want to used BeSweet but can't find any proper guide around(to me heac3he looks pretty simple and easy to do)
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  #19  
11-25-2003, 05:45 AM
Dialhot Dialhot is offline
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How do you think besliced repairs the last frame Headache find corrupted ?

Besweet is very simple to use. Do you have the graphical intarface (BesweetGUI) ?
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  #20  
11-25-2003, 05:57 AM
the_ray the_ray is offline
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yes ..i do..BeSweetGUIv0.6...i did all the settings already using wizard and then when i click GO a BeSweet.log pops up and then i am lost....
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