On 10/8/12 9:25 PM, Oliver Hookins wrote:
Didn't get a chance to try this unfortunately, but I ended up
re-encoding the files with the "-movflags frag_keyframe" option and
the progressive-download playback problems went away. It's a bit odd
because the container is MP4 and not MOV, and I understand this option
to be more relating to video but evidently something in the code path
is making a difference...
mp4 and mov are generated by the same muxer (and are the same format for
the most part...)
So either flash is out of specification or there is something with the
specific player... (or the interpretation of the paragraph could be
different)
Well, I'm encoding these with "-b:a 96000" and I would expect constant
bitrate to be used, so this makes no sense on two levels. Given what I
discovered above with the keyframe fragment option, the average
bitrate metadata seems to be a red herring, but even obeying the
standard, avconv should be setting a constant bitrate and expressing
that bitrate in the metadata.
Apparently it isn't constant for the muxer check, looks like something
is going on there...
Which is your exact command line ?
The second point I would make is that an "average" bitrate value only
makes sense in the case of something that varies - a constant bitrate
has no need of an average, but I guess that's something we can blame
the specification authors for.
Sadly, yes...
lu
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