Can muxers/multifilesink drop frames?

[pisymbol .]

On Wed, Sep 25, 2019 at 10:29 AM Tim Müller <tim at centricular.com> wrote:

> On Wed, 2019-09-25 at 15:28 +0100, Tim Müller wrote:
>
> > Mmh, not really/necessarily, you can't just concatenate Matroska
> > files. It might work with splitmuxsrc however.
>
> Make that splitfilesrc.
>

So here is a concrete example of a 29+ minute recording:

$ for f in /mnt/storage/capture_*.mkv; do ffprobe -v fatal -count_frames
-select_streams v:0 -show_entries stream=nb_read_frames -of
default=nokey=1:noprint_wrappers=1 $f; done >> counts
$ cat counts | paste -sd+ - | bc
52375

That should be the total number of frames in all of the mkv captures of
stream 0. The problem is if I count the number of times my handoff function
is called for frames in stream 0, I get:

"total_frames_0": 52782

So I'm trying to figure out where did the extra 407 frames come from/go? Or
am I counting the frames incorrectly above?

-aps
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