[ogg-dev] How to concatenate Ogg in the browser JS?
Ralph Giles
giles at thaumas.net
Thu Nov 15 16:39:38 UTC 2018
On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote:
> Note: Stream 1 has serial number 0, which is legal but may cause problems with some tools.
Note if *both* files have the same serial number, it's impossible to
find the points where they were concatentated by bisection, and most
tools will assume they've found all the sections and calculate an
incorrect duration. They can still be played individually because there
is not concatenation boundary to find in the individual case.
If ogginfo shows the same serial (00000000) for both of your input
streams, that's likely the problem. Muxers are supposed to use a random
serial number to make conflicts unlikely. You can fix them by rewriting
the serial number so there's no conflict. Basically, you change the
serialno field in each ogg page header and then update the crc.
If you want an example, I have a quick script for doing this in
https://git.xiph.org/?p=rogg.git;a=blob;f=rogg_serial.c
HTH,
-r
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