[vlc-devel] debugging dvd that plays in 4x3 instead of 16x9

[Steve Lhomme]

Hi,

Could you open an issue in Gitlab ? That's where it should be tracked 
properly. That sounds indeed like a bug. I'm not sure we support the 
aspect ratio forced by the IFO (nor if it has priority over the VOB).

https://code.videolan.org/videolan/vlc/-/issues

Make sure to add the details you put in these 2 emails.

On 2021-08-01 6:52, Shaya Potter wrote:
> following up on this, I'm pretty sure it's a bug in vlc.  the IFO file
> is set to 16x9, but the VOB is set to 4x3.  Per discussion online, it
> seems DVD players are supposed to follow the IFO, not the VOB
> 
> mediainfo from IFO
> 
> $ mediainfo VTS_05_0.IFO
> General
> Complete name                            : VTS_05_0.IFO
> Format                                   : DVD Video
> Format profile                           : Program
> File size                                : 42.0 KiB
> Duration                                 : 46 min 21 s
> Overall bit rate mode                    : Variable
> Overall bit rate                         : 124 b/s
> 
> Video
> ID                                       : 224 (0xE0)
> Format                                   : MPEG Video
> Format version                           : Version 2
> Duration                                 : 46 min 21 s
> Bit rate mode                            : Variable
> Width                                    : 720 pixels
> Height                                   : 480 pixels
> Display aspect ratio                     : 16:9
> Frame rate                               : 29.970 (29970/1000) FPS
> Standard                                 : NTSC
> Compression mode                         : Lossy
> 
> <snip>
> 
> but from VOB
> 
> $ mediainfo VTS_05_1.VOB
> General
> Complete name                            : VTS_05_1.VOB
> Format                                   : MPEG-PS
> File size                                : 1 024 MiB
> Duration                                 : 21 min 59 s
> Overall bit rate mode                    : Variable
> Overall bit rate                         : 6 507 kb/s
> 
> Video
> ID                                       : 224 (0xE0)
> Format                                   : MPEG Video
> Format version                           : Version 2
> Format profile                           : Main at Main
> Format settings                          : CustomMatrix / BVOP
> Format settings, BVOP                    : Yes
> Format settings, Matrix                  : Custom
> Format settings, GOP                     : M=3, N=15
> Format settings, picture structure       : Frame
> Duration                                 : 21 min 59 s
> Bit rate mode                            : Variable
> Bit rate                                 : 5 993 kb/s
> Maximum bit rate                         : 3 500 kb/s
> Width                                    : 352 pixels
> Height                                   : 480 pixels
> Display aspect ratio                     : 4:3
> Frame rate                               : 29.970 (30000/1001) FPS
> Standard                                 : NTSC
> Color space                              : YUV
> Chroma subsampling                       : 4:2:0
> Bit depth                                : 8 bits
> Scan type                                : Interlaced
> Scan order                               : Top Field First
> Compression mode                         : Lossy
> Bits/(Pixel*Frame)                       : 1.184
> Time code of first frame                 : 00:00:00:00
> Time code source                         : Group of pictures header
> GOP, Open/Closed                         : Closed
> Stream size                              : 943 MiB (92%)
> 
> VLC doesn't seem to respect the IFO's aspect ratio flag and is just
> using the VOBs.
> 
> On Sat, Jul 31, 2021 at 10:16 PM Shaya Potter <spotter at gmail.com> wrote:
>>
>> so I have a DVD whose main feature is supposed to be in 16x9 but vlc
>> is playing it in 4x3 on both the normal linux player and in android
>> (as an aside, I couldn't figure out how to play it in android without
>> turning it into an iso).
>>
>> It appears squashed and setting the aspect ratio manually to 16x9
>> seems to make it look right.
>>
>> On the other hand, I played it in Kodi on android and it seemed to
>> come up in 16x9 as expected (and a 4x3 extra came up as 4x3).
>>
>> any ideas on how to debug this?
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