vob default aspect ratio bug

[cybmole]

is there a problem in 1.02 with .vob file default aspect ratio ?

I am currently using a 2 step DVD to avi conversion process, which preserves original audio and which removes the annoying black bars from some DVd rips, that other rippers leave behind:

step 1: I make vob from DVD files using VOB passthrough in DVDfab. that simply rewrites elevent sections of VTS...VOb files as a single file.
step 2: I then convert these to .avi with Divx converter, to use in VLC

the end product - the .avi - is fine & plays correctly in VLC.

But the intermediate product i.e. the VOB file often displays in VLC with a wrong default aspect ( I play at this stage to check that I have extacted the correct part of the DVD )
it's either too stretched vertically or too stretched horizontally . same vob file in powerdvd is correct, and is also correct on zoom player thus problem is with how VLC plays VOB???
NB I can make it look right but forcing a specific aspect ratio, but it would be better if default worked properly.

[VLC_help]

You have some short sample file you could share to us?

[cybmole]

You have some short sample file you could share to us?

unfortunately no nothign small enough to attach here - - I have some that are 4x3 aspect but which appear vertically stretched & which are just under 20Mb so I could send one of them to a given address via yousendit if that would help

[VLC_help]

Rapidshare or Megaupload or similar service is OK.

[cybmole]

Rapidshare or Megaupload or similar service is OK.

have to be a paid up member to upload on those ?

yousendit is free for up to 100mb but has to be for a specific recipient email address.

maybe simpler for you to just test with any.VOB files you have to hand e.g. from inside any DVD video_TS folder

[VLC_help]

have to be a paid up member to upload on those ?

Both are free.

[cybmole]

have to be a paid up member to upload on those ?

Both are free.

ok, I did not realise that. I am uploading a vob file to rapidshare. this is supposed to 4x3 aspect but appears vertically stretched in VLc - you'll see the differece if you force 4x3 in aspect raio controls.
NB I should have picked a better example - it doesn't look obviously wrong as 1st glance but trust me it is .
force it into 4x3 to see how it is supposed to look.

I will also upload the result after the same file after has been converted to avi in dixv converter - and renamed. it now displays correctly, so the vob msut contain crrect display info somewhere ?

Your file has been saved and can now be downloaded 10 times. It will be deleted after 90 days without download. If you would like to enable more people to download your file, please transfer it to a free Collector's Account or a Premium Account
1. Download Link: Click here to download file
http://rapidshare.com/files/289368716/C ... 2.vob.html
MD5: 9A62F65C8D8C754280CF30A8F4E87FB5

2

http://rapidshare.com/files/289371210/S ... 1.avi.html
MD5: 10645C9355B8E9FF614D54DE1D58EE79

[cybmole]

I'm now looking at a diferent file with possibly a different bug,
It is a vob taken from a concert dvd 4:3 ratio and converted to avi with DIVX converter. but in this case the AVI also looks wrong. Gspot says it's now 13:10. (628x 480) but that the VOB was 4:3 (720 x 480 with par 0.89 ). I will rerun the Divx conversion on that to see where/why it changed.

But In zoom plyer, there's a "derived" aspect ratio (default) which looks correct, and a "source" aspect ratio which looks wrong. VLC looks like zoom + source i.e. a bit too tall & narrow.
[ definition of derived:
"Derived" mode Automatically Adjusts Aspect Ratio for badly encoded content
Some media content is badly encoded in a way that distorts the aspect ratio. With this setting enabled and Zoom Player aspect ratio mode set to "Derived", Zoom Player will attempt to compenstate for badly encoded content by trying to make it fit to 4:3 or 16:9 as long as the AR skew isn't too big. end of definition ]

SO does vlc have the equivalent of ZP's "derived" aspect ratio & if so how do I enable it as default. ?

IN the meantime I wil check out more of my music files. I though Id' hit a foolproof conversion methos of getting excellent video files from my DVDs but now I'm having second thoughts because of these aspect ratio issues....
looking now at what should be a 16:9 file - avi conversion from 16:9 DVD. gspot says it has become ratio 1.702 not 1.777 so again a bit of vertical stretching has baan added in the conversion process. not really noticable until I go looking for it, but now that I know about it it is bugging me. I think I can overcome this by forcing custom resolutions in DIVX converter ( am now testing this - hmm, no ... I took a 640x480 file & told Divx to keep it that way but output was 628 x 480 -seems DIVx converter removes any black borders ( good), but in doing so It introduces non standard ratios with confuse players ike VLC ) .
redid the 16:9 test and itcame out as 708 x 416 - trimmed from 720 again because of borders ?

[VLC_help]

SO does vlc have the equivalent of ZP's "derived" aspect ratio & if so how do I enable it as default. ?

No.

The aspect ratio of the video isn't a 4:3 according to Mediainfo. It is ~1.388888 so it is little more wider than 4:3 (would be 1.333333). But you are correct, VLC doesn't display it right (resolution is ~720x640 when it should be something like 800x576)

EDIT:
trac-test.videolan.org/vlc/ticket/3091

[cybmole]

ok thanks for checking - I have put the "A" key for cycle through aspect ratios on my remote so I can quickly flick through the choices - I can live with that.

[md]

Does the original DVD play correctly in VLC?

I suspect DVDfab is either crappy, or you have set it up for US TV standard (NTSC).

The VOB you posted has the following parameters:

SEQUENCE MPEG2 MP@ML PAL COLORS (prim BT.470-2/M trans BT.470-2/M matrix BT.470-2/B,G) 720x576 chroma 360x288 fps 25 maxBps 1062500 vbv 229376 picture 720x576 display 720x480 pixel 8x9

This is utterly broken, if a DVD is encoded as 720x576, it shoud by no means have a display size of 720x480 !

[cybmole]

Does the original DVD play correctly in VLC?

I suspect DVDfab is either crappy, or you have set it up for US TV standard (NTSC).

The VOB you posted has the following parameters:

SEQUENCE MPEG2 MP@ML PAL COLORS (prim BT.470-2/M trans BT.470-2/M matrix BT.470-2/B,G) 720x576 chroma 360x288 fps 25 maxBps 1062500 vbv 229376 picture 720x576 display 720x480 pixel 8x9

This is utterly broken, if a DVD is encoded as 720x576, it shoud by no means have a display size of 720x480 !

wht I posted was from a PAL dvd which does play OK in VLC.
DVD fab reckons it is dealing with a 4x 3 source.
I can open one of the vob files in the DVD video_ts folder in gspot - this is what I then see:
I/L TFF PAL
pic 720 x576 seq ext 720 x480 4:3 sar 1.25 par 1.067 dar 1.3333

I'd post a gspot screen grab but cannot figure out how

[md]

Yep, if the original DVD plays fine in VLC, it's the DVDfab which introduces this nonsense into your VOBs.

Please check if there is a configuration option somewhere in DVDfab, which will allow you to set TV standard (PAL instead of NTSC) or output format (720x576 instead of 720x480). If not, ask their support why they don't handle PAL DVDs correctly.

The resulting VOB should have a display size of 720x576, and not 720x480 if PAL is used.

[cybmole]

Yep, if the original DVD plays fine in VLC, it's the DVDfab which introduces this nonsense into your VOBs.

Please check if there is a configuration option somewhere in DVDfab, which will allow you to set TV standard (PAL instead of NTSC) or output format (720x576 instead of 720x480). If not, ask their support why they don't handle PAL DVDs correctly.

The resulting VOB should have a display size of 720x576, and not 720x480 if PAL is used.

no such options in DVDFAB
- their option that I am using is called VOB passthrough - it is meant to change nothing - just remove encryption and create a single output file per title rathar than VOB files split into 1 GB chunks as found in the original VIDEO-TS folder.

I was using that option only to create a file which could them be converted into DIVX via DIVX converter.
it now seems better to use DVDFAb's own converter work directly on the source DVD, not on an intermediate VOB file. It cannot output divx but it can output what seems equally good xvid ( when run as a 2 pass process) with audio - passthrough.

[md]

Just FYI, it's also possible to play such broken VOBs in VLC, but you have to use a special option:

vlc --codec=ffmpeg Classic_Rock_Guitar_Solos_Vol_1.Title2.vob

This option will use different decoder, which ignores display info.