If you load your mp4 (or any other video file) in 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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Thank you for that helpful information! And now am aware of another potential landmine: Glitches at the junctions of VOBs. Would this DVD Decryptor have a way to fix the aspect ratio problem that started this thread? If so, what would the settings be to take me from my DVD to the desired glitch-free MP4 with correct aspect ratio? Thanks!
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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. -
There is a case where this is perfectly correct. Possibly that DVD has the rather seldomly used Pan & Scan display option enabled (applies only to 4:3 output). In such case, even though the video is actually anamorphic 16:9, the VOBs have to be be flagged as 4:3, and the Sequence Display Extension also has to be present and set to (most likely) a width of 540. This width then represents the indicated aspect ratio. That might seem pretty unintuitive, but it makes sense if one does the math.
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Mp4 isn't a zip like format,it's just a different container format than vob,
I think,therefore i am a hamster. -
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I've re-encoded truckloads of DVDs and never experienced glitches. Vob files in a sequentially numbered set are supposed to be treated as though they're one large file, which is actually what they are, only split into sections.
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.Avisynth functions Resize8 Mod - Audio Speed/Meter/Wave - FixBlend.zip - Position.zip
Avisynth/VapourSynth functions CropResize - FrostyBorders - CPreview (Cropping Preview) -
@GreenRobert, I don't know if you have sorted this out, but ProWo has modified his CleverFFMPEG GUI to add a feature which will change the aspect ratio of your VOB from 4:3 to 16:9.
It works well. -
FWIW
Aspect ratio is controlled in 2 places:
The encoded pixel aspect ratio (PAR) and the Display aspect ratio (DAR)
the ffmpeg docs have an explanation.
I spotted this when UK freeview broadcast entire series in the wrong ratio
and had to add the 2 means of correction into my own ffmpeg toolkit.
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