AW: Getting Timestamps From a Resulting Video File With splitmuxsink

[Michael MacIntosh]

Hey,

Thank you guys for all of your responses!  The message should do the trick!

For some reason I didn't even think that the splitmuxsink would be 
posting messages on the bus.  Is there documentation on this? The 
gstreamer documentation on element messages says check the documentation 
for that element, but from what I can tell, no elements have 
documentation stating what element messages they use.  I just had to 
look over the source code to find out what the parameters were for 
"splitmuxsink-fragment-opened".

Anyways, after some digging I realized that the splitmuxsink holds onto 
the last I frame it has received and only writes to the file when it 
gets the next I frame (it has a full GOP length).

This makes things interesting when you grab a specific frame from the 
stream, and want to know where in the output video file it would land, 
because you technically wouldn't know until the splitmuxsink makes the 
decision that it will either record that GOP to the current file, or 
that the GOP is too big (I am rotating on max bytes) and it needs to 
save it to a new file.

For now I can grab the starting times and filenames from the bus with 
the "splitmuxsink-fragment-opened" message, and use them to build a 
mapping, and calculate the differences when recording has finished.

Still, it feels like I am missing the mark, I feel like the muxer or the 
filesink should be aware of what the timestamp is going to be in the 
file it is writing to, but whatever.

Cheers,

Michael.


On 6/14/2017 1:55 AM, Thornton, Keith wrote:
> Splitmuxsink sends splitmuxsink-fragment-opened / splitmuxsink-fragment-closed messages for each fragment.
>
> -----Ursprüngliche Nachricht-----
> Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Tim Müller
> Gesendet: Mittwoch, 14. Juni 2017 10:40
> An: gstreamer-devel at lists.freedesktop.org
> Betreff: Re: Getting Timestamps From a Resulting Video File With splitmuxsink
>
> On Tue, 2017-06-13 at 18:31 -0700, Michael MacIntosh wrote:
>
> Hi Michael,
>
> Doesn't splitmuxsink post ELEMENT messages on the bus that give you a mapping of running time to filename ?
>
> If you keep track of those it should allow you to figure out which file it is and what the time into the file part is.
>
> Alternatively you could just use splitmuxsrc of course and seek to the right location that way based on the original timestamp.
>
> Cheers
>   -Tim
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com _______________________________________________
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