[Mp4-tech] [Video] (Static) Compliance testing of ISO/IEC 14496 video bitstreams

[Sharon Silverman]

Hi MP4-Tech members,
   I need a clarification regarding the procedure for
(static) compliance testing of ISO/IEC 14496 video
bitstreams.
   14496-4 states in Section 4.5.4 (Implementation of
the static test) that one needs to decode the given
video bitstream by the decoder under test (DUT) first.
Then, this video bitstream is decoded by the reference
decoder with the restriction that the frame buffers of
the reference decoder are initialized with the
reconstructed samples captured from the DUT that
correspond to those reference frames (the so called
"frame buffer intercept method").
  Now the reference decoder can not be used straight
away for this purpose, as it is in its current form.
  But then the question is, who is supposed to make
the necessary modifications to the reference decoder
to implement this "frame buffer intercept method" ? If
leave it to every implementer of a 14496-2 decoder, we
are intrinsically making it mandatory for him to
understand the reference decoder to an extent he
actually may need not to. This is clearly duplication
of work, not to mention the bugs which may creep in
when every developer tries to modify the reference
decoder for static conformance testing.
  Would it not be more sensible if there is a version
of reference decoder provided that provides a clear
and clean interface for "frame buffer intercept
method" ? This helps everyone, and the testing
procedure gets further standardized.
    I look forward to comments/pointers.
Thanks,
Sharon
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