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720x576 that turns to 1365x576 instead of 1024x576
Posted: 16 Oct 2009 17:21
by lwc
Here's a MPEG-2 clip with a video stream size of
720x576, but with a wider Mpeg DAR (Display Aspect Ratio):
http://rapidshare.com/files/293457824/n ... c.mp2.html - 3 Mb
PowerDVD reports the file as:
Video Attributes:
Video compression mode: MPEG-2
TV system: 625/50 (PAL)
Aspect Ratio: 16:9
Display Mode: Both Pan&scan and Letterbox
Source picture resolution: 720x576 (625/50)
Frame Rate: 25.00
Source picture letterboxed: Not letterboxed
Bitrate: 10.48Mbps
16:9 would turn
720x576 into
1024x576. Alas, VLC turns it to
1365x576 instead, which would make it CinemaScope (2.35:1 which is roughly 1365/576~2.37):
http://img235.imagevenue.com/img.php?im ... _358lo.jpg
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 16 Oct 2009 18:07
by Lotesdelere
This video IS marked as having a 2.35:1 DAR so VLC is displaying it right accordingdly:
Code: Select all
General
Complete name : E:\Temp\no-audio-in-mpc.mp2
Format : MPEG-PS
File size : 2.63 MiB
Duration : 3s 168ms
Overall bit rate : 6 966 Kbps
Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, Matrix : Default
Duration : 3s 120ms
Bit rate mode : Constant
Bit rate : 6 500 Kbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 2.35:1 <====
Frame rate : 25.000 fps
Standard : PAL
Colorimetry : 4:2:0
Scan type : Interlaced
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.627
Stream size : 2.42 MiB (92%)
Audio
ID : 128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Duration : 3s 168ms
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Surround: L R, LFE
Sampling rate : 48.0 KHz
Video delay : -48ms
Stream size : 173 KiB (6%)
Maybe the video should be remuxed with the correct DAR of 16:9 because I think there is a conflict between the MPEG PS container DAR and the video stream DAR..
Notice that you can change the aspect ratio from the Video menu -> Aspect ratio then select 16:9.
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 16 Oct 2009 22:43
by lwc
This video IS marked as having a 2.35:1 DAR so VLC is displaying it right accordingdly
Is this from MediaInfo? I know it claims 2.35:1 but PowerDVD claims otherwise.
Maybe the video should be remuxed with the correct DAR of 16:9 because I think there is a conflict between the MPEG PS container DAR and the video stream DAR.
.
Remuxed how? We're talking about a clip that was ripped as is. If it's ripped as is, why should it be modified?
Notice that you can change the aspect ratio from the Video menu -> Aspect ratio then select 16:9.
I know. This is what I think should happen by itself.
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 16 Oct 2009 23:11
by Lotesdelere
Is this from MediaInfo? I know it claims 2.35:1 but PowerDVD claims otherwise.
Yep that's from MediaInfo but you're right some other tools are reporting 16:9 so I'm not sure if MediaInfo is reporting the information from the container or from the video stream.
Remuxed how? We're talking about a clip that was ripped as is. If it's ripped as is, why should it be modified?
AviDemux can do that with the Copy Streams feature, you can also try
ProjectX (this recent build from Oozoon requires Java 1.6).
I know. This is what I think should happen by itself.
I know so I've opened a ticket: trac.videolan.org/vlc/ticket/3111
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 17 Oct 2009 13:15
by lwc
Thanks for the ticket!
When you say remuxed, are those programs rippers or do they take ripped files and do something to them?
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 17 Oct 2009 13:37
by VLC_help
trac.videolan.org/vlc/ticket/3091
maybe merge this tickets.
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 19 Oct 2009 17:41
by md
How you got this file - i.e. what exact software was used to rip it from DVD?
The MPEG2 sequence headers are broken:
SEQUENCE MPEG2 MP@ML PAL BT.470-2/B,G 720x576 chroma 360x288 fps 25 maxBps 812500 vbv 229376 picture 720x576 display 540x576 pixel 256x135
display width (540) is lower than encoded width (720).
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 26 Oct 2009 12:46
by lwc
How you got this file - i.e. what exact software was used to rip it from DVD?
How you got those stats? Well, I've used DVD Decrypter + Mpg2Cut2, but got the same results with DVDShrink.
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 26 Oct 2009 12:57
by md
mpeg2dec -v -s0 no-audio-in-mpc.mp2
If VOBs from DVDShrink (full transfer) look the same, then this DVD was incorrectly manufactured.
More details at:
http://trac.videolan.org/vlc/ticket/3111
Re: 720x576 that turns to 1365x576 instead of 1024x576
Posted: 29 Oct 2009 13:18
by lwc
The output from the DVD itself is the same:
The output from DVDShrink is the same:
And here's a sample VOB of this film made by DVDShrink (with no video compression, in case it matters):
http://rapidshare.com/files/299519351/band.vob.html - 466 Kb
But it's an almost Oscar nominated film, so it's not exactly an unknown film (not that it promises anything, but still).
