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

[Shaya Potter]

done https://code.videolan.org/videolan/vlc/-/issues/25961

On Mon, Aug 2, 2021 at 9:40 AM Steve Lhomme <robux4 at ycbcr.xyz> wrote:
>
> 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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