[File] [PATCH] of Magdir/riff for VirtualDub link *.vdr + *.avi *.divx

[Christos Zoulas]

Committed, thanks!

christos

> On Jul 10, 2020, at 11:30 AM, Jörg Jenderek <joerg.jen.der.ek at gmx.net> wrote:
> 
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> Hello,
> some days ago i handled some video files.
> When i run file command version 5.39 on VirtualDub links with file
> name extension vdr and related videos i get an output like:
> 
> my-avi.avi:              RIFF (little-endian) data,
> 			 AVI, 640 x 480, 30.00 fps,
> 			 video: Motion JPEG
> SharkTaleHD.divx:        RIFF (little-endian) data,
> 			 AVI, 720 x 384, 24.00 fps,
> 			 video: DivX 5,
> 			 audio: MPEG-1 Layer 3 (stereo, 44100 Hz)
> virtualDub-3.vdr:        RIFF (little-endian) data
> VirtualDub-Signpost.vdr: RIFF (little-endian) data
> virualdub-mpg.vdr:       RIFF (little-endian) data
> 
> All samples are at least general described by Magdir/riff  with line
> 0	string		RIFF		RIFF (little-endian) data
> but sub type classification is missing for VirtualDub links.
> Furthermore with --extension option only ??? is displayed.
> 
> Some information about such VirtualDub links is found on file
> formats archive team website. That is now expressed by comment line
> like:
> # URL:	http://fileformats.archiveteam.org/wiki/VDR_(VirtualDub)
> 
> More file formation information can be get from sources of
> VirtualDub. This is expressed by reference comment line like
> # Ref.: sourceforge.net/projects/virtualdub/files/virtualdub-win/
> #	1.10.4.35491/VirtualDub-1.10.4-src.7z/src/vdremote/Main.cpp
> According to documentation the second RIFF tag for VirtualDub link
> is VDRM. That is expressed by additional line
>> 8	string		VDRM		\b, VirtualDub link
> Afterwards show a user defined mime type and file name extension by
> lines like:
> !:mime	video/x-vdr
> !:ext	vdr
> After that characteristic string comes the upcased phrase PATH,
> that is followed by pascal string with remote-path to video file.
> That information is shown by lines like:
>>> 12	string		PATH		\b, PATH
>>> 16	pstring/l	x		%s
> 
> To display file name extension for AVI videos i add after line with
> mime type video/x-msvideo a line like:
> !:ext	avi/divx
> 
> After applying the above mentioned modifications by patch
> file-5.39-riff-vdr_avi.diff then all VirtualDub links are
> identified and i get also an extension output like:
> 
> my-avi.avi:              RIFF (little-endian) data,
> 			 AVI, 640 x 480, 30.00 fps,
> 			 video: Motion JPEG
> SharkTaleHD.divx:        RIFF (little-endian) data,
> 			 AVI, 720 x 384, 24.00 fps,
> 			 video: DivX 5,
> 			 audio: MPEG-1 Layer 3 (stereo, 44100 Hz)
> virtualDub-3.vdr:        RIFF (little-endian) data,
> 			 VirtualDub link, PATH
> 			 My-PC3/lc-record-2020-04-15.avi
> VirtualDub-Signpost.vdr: RIFF (little-endian) data,
> 			 VirtualDub link, PATH
> 			 MyPC2/my-avi2.avi
> virualdub-mpg.vdr:       RIFF (little-endian) data,
> 			 VirtualDub link, PATH
> 			 MyPC4/centaur_1.mpg
> 
> I hope my diff file can be applied in future version of
> file utility.
> 
> With best wishes
> Jörg Jenderek
> - --
> Jörg Jenderek
> 
> 
> 
> 
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