clever FFmpeg-GUI) then, after analysis, the streams contained in it are displayed.
Here you can see the individual streams (video, audio, subtitles), their codec and other information.
Then click on Main, at Extract you can extract the individual streams.
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I am not sure if you mentioned that, apart from the vobs, the ifos on the dvd were also reported to be 4:3. Now by 4:3 I mean not what you see in playback but what the aspect ratio from mediainfo (text mode - an example from your sample vob was shown earlier in this thread) is reported.
Now if all ifos AND vobs report as 4:3 then your dvr must have an output setting that forces playback to 16:9 whereas even if the vobs are reported as 4:3 but the ifos report as 16:9 if you load the dvd into any software player, including vlc it really should playback as 16:9
Now I mention this since I actually own a commercial dvd, from MGM no less so it really is not some fly-by-night operation, that has just this - all vobs report as 4:3 but the ifos report as 16:9 so playback is 16:9
And I discovered this when I sought to convert to plain mpeg2 (there should be no glitches with this method) the dvd using vob2mpg which resulted in a 4:3 mpg file and not what I expected to get.
Mp4 isn't a zip like format,it's just a different container format than vob,I think,therefore i am a hamster.
MKVToolNixGUI has a special mode for remuxing sets of vob files as single MKVs. Normally you'd use the "Append files" option to join files, but there's an "Add files as additional parts" option for vobs which treats them as one continuous file.
Most encoding GUI's or the tools they use treat multi-part vob files as a single file and without requiring an IFO file to tell them anything. One of the most commonly used Avisynth tools for indexing and decoding vob files doesn't even open IFO files.
You can try changing the DAR while remuxing the vobs as MKVs to see if your player will obey it, assuming it'll play MKVs, or MakeMKV is dedicated to remuxing DVDs and Blurays as MKVs. It might let you change the DAR too. I'm not sure.
If you intend to do a bit of re-encoding and don't mind a bit of a learning curve though, give MeGUI a try. If the display aspect ratio is wrong it's easy enough to change it. MeGUI uses that DAR as the starting point for calculating resizing etc. Or you can disable resizing and just re-encode using the corrected DAR. I tend to resize so there's no aspect ratio to get wrong. The video dimensions are the DAR.
[Attachment 67787 - Click to enlarge]
Cropping away the crud, de-interlacing to 60fps and resizing to non-anamorphic dimensions. With the black cropped, the remaining picture probably has a DAR of 1.8 rather than 1.778. There's also a sample of the vob file remuxed as an MKV (no encoding) with the DAR changed to 16:9 if you want to test it.