[vlc-devel] [vlc-commits] commit: stream_filter/httplive.c: HLS stream size calculation ( Jean-Paul Saman )

Jean-Paul Saman jpsaman at gmail.com
Thu Dec 23 09:41:02 CET 2010


On Wed, Dec 22, 2010 at 8:09 PM, Kurle, Brian <Brian.Kurle at arrisi.com> wrote:
> Jean-Paul,
> I'm not completely follow what you are doing here.   The bandwidth provided in the M3U8 is only the maximum that none of the segments will exceed, not an average, or accurate summation of the collection.   However, in practice none of the segments are actually going to require this bandwidth (mostly because they are usually VBR).    This has been an issue that I've been pondering, myself when trying to fully analyze how the various Apple clients behave (and I find they, too, behave poorly when bandwidth availability changes in some situations).

Of course you are right, but it is simply not possible to know exactly
how long (in bytes) each segment will be. Unless you download them
all. By using the segment duration times the bandwidth you get an
approximation of the length. Which is by no means accurate, but it is
as good as you can get given the information provided. Without such an
assumption seeking would be impossible.

Kind Regards
Jean-Paul Saman

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