[FFmpeg-trac] #2909(avcodec:new): Make dvbsubs more compliant among stb's

[FFmpeg]

#2909: Make dvbsubs more compliant among stb's
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             Reporter:  Tommy2d      |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  1.2.2        |               Resolution:
             Keywords:  dvbsub       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by waider):

 It looks like the reserved bits can be 1 or 0 depending on where they are.
 The current spec
 (https://www.etsi.org/deliver/etsi_en/300700_300799/300743/01.06.01_60/en_300743v010601p.pdf)
 says:

 > reserved: When used in a clause defining the coded bit stream, this
 field indicates that the value may be used for extensions in the future.
 Unless specified otherwise within the present document, all "reserved"
 bits are expected to be set to "1".
 > reserved_zero_future_use: When used in clauses defining the coded bit
 stream, this field indicates that the value may be used in future
 revisions for ETSI-defined extensions. All "reserved_zero_future_use" bits
 are expected to be set to "0".

 (Yes, adding an note to a 12-year-old bug report. I happened to be poking
 in the spec for something else.)
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Ticket URL: <https://trac.ffmpeg.org/ticket/2909#comment:9>
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