#11354: Certain PlayStation STR complained "Invalid data"
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Reporter: Joseph | Owner: (none)
DeVore |
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: psxstr | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 1 |
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Comment (by Joseph DeVore):
this is what a person on the DuckStation Discord server had to say about
what DuckStation's ISO browser did or does...
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each sector on a CD is 2352 bytes
a data track on a playstation CD follows the CD-ROM XA standard, where
there are two types of sectors, "mode 2 form 1" and "mode 2 form 2"
"mode 2 form 1" uses 2048 of those 2352 bytes for data and the rest for
things like error correction, and this form is used for most data because
CDs are unreliable and that error correction is really important if it's
something like code
"mode 2 form 2" uses 2324 of those 2352 bytes for data, getting rid of the
error correction in exchange for more space, and is generally used for
compressed audio where small errors are not a big deal
so, most files on a PlayStation disc will use mode 2 form 1, with mode 2
form 2 only used for compressed audio, either on its own or within a video
file
so each of those .STR files contains a mix of those two sector types
the problem you're running into is that DuckStation's ISO browser simply
dumps 2048 bytes of data for every sector regardless of what type it is
whereas ffmpeg actually wants the full raw 2352 byte sectors
try dumping the files with jpsxdec instead
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Ticket URL: <https://trac.ffmpeg.org/ticket/11354#comment:8>
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