Author Topic: vdr.trid.xml for VirtualDub link *.vdr  (Read 182 times)

jenderek

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vdr.trid.xml for VirtualDub link *.vdr
« on: July 12, 2020, 03:49:44 PM »
Hello trid users,

some days ago i handle some video files. I run TrID on VirtualDub links with
file name extension vdr and related videos.
All VDR samples are described correctly as Generic RIFF container by
riff.trid.xml ( see appended output/trid-v-old.txt), but sub type
classification is missing.

The newest file(1) command describes such CDR examples as VirtualDub link
(see appended output/file-new.txt).

All such inspected VDR samples are RIF containers. This is expressed by XML
construct like:
   <Bytes>52494646</Bytes>
   <ASCII> R I F F</ASCII>
   <Pos>0</Pos>

Some information about such VirtualDub links is found on file formats
archive team website. That is now expressed by line like:
   <RefURL>https://fileinfo.com/extension/vdr</RefURL>

According to documentation the second RIFF tag for VirtualDub link
is VDRM. After that characteristic string comes the up cased phrase PATH,
that is followed by pascal string with remote-path to video file.
That information is shown by XML construct like:
   <Bytes>00005644524D50415448</Bytes>
   <ASCII> . . V D R M P A T H</ASCII>
   <Pos>6</Pos>
The size of PATH is stored as 4 byte integer at offset 16. Because of file
system limitation the high values could never appear. So assuming a possible
maximal value 65535 for path gives 2 null upper bytes. That is expressed by
XML construct like:
   <Bytes>0000</Bytes>
   <Pos>18</Pos>
A user defined mime type is shown by line like:
   <Mime>video/x-vdr</Mime>

With the new definition files the VirtualDub links are now recognized ( see
appended output/trid-v-new.txt). TrID definition, some examples and output
are stored in archive vdr.zip. I hope that my XML file can be used in future
version of triddefs.

With best wishes
Jörg Jenderek

Mark0

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Re: vdr.trid.xml for VirtualDub link *.vdr
« Reply #1 on: July 12, 2020, 06:10:20 PM »
Thanks, but there's already a VDR definition, I have uploaded it just yesterday! :)