Hello Lawrence,
first of all I suspect these issues have arisen only because a 'beta'
version rather than an 'official' release has been used in the first
place.
QT 7.0.4 was officially released in January this year...
The reason why 'newer' quicktime players show a white frame is because the
encoded H.264 track advertises itself as Profile 40 and Level 1, both
'unkown' values. QuickTime player simply decides to mark the track
unplayable with the obvious consequences.
If, on the other hand, one uses an alternative player like VLC
(http://www.videolan.org) the movie clip plays without any problems.
Anyway, a remedy is at hand. If one uses Dumpster (available from the
Apple Quicktime developer web site, v7 for MacOS and a very old one for
Windows) it is possible to edit the movie clips and replace the 'bad'
profile and level values with better ones...
I'd recommend using the newest MacOS version for simplicity of navigation.
What needs to be done is to replace the following 3 bytes:
400001
appearing twice in the 'avcC' image description extension (61766343 in
hex) for the video track with the following ones:
4DC014
i.e. setting Profile to Main and Level to 2.0 (to be on the safe side) and
changed accordingly the Profile compatibility flags to C0
once these changes are applied the movie clip will play in QuickTime
Player 7.1.3 (well, the version I have installed on my machine).
Hope it helps and if further details are needed, don't hesitate to ask.
best regards
andrea
LAR:=Lawrence A. Rowe
LAR> Andrea Barbieri wrote:
LAR> >
LAR> > may be it is just an 'hinting' problem rather than the actual
LAR> > encoded material although your 'local' tests seem to exclude this.
LAR> ----
LAR>
LAR> you can download a sample file (35MB) from
LAR> http://bmrc.berkeley.edu/research/nossdav05/mov/qa7-h264-600kbs.mov
LAR>
LAR> the file is hinted by QtPro v7.0.4 (beta), so if this is the problem
LAR> it is something that apple changed.
LAR>
--
Andrea Barbieri
PGP ID=0x034DFD5A KeyFingerprint=C168EA9A7189538D214F1281A7529F32034DFD5A
Moving Image Research http://www.movingimageresearch.com/
The Workshop, Hampton Lane, Bristol, BS6 6LE, UK
Tel +44 117 9732200, FAX +44 117 9732210
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