[FFmpeg-devel] [PATCH 2/3] ffmpeg.c: Continuously log current kbps and kBytes total for each non-seekable (aka live) output stream.

[Michael Niedermayer]

On Mon, Aug 13, 2012 at 07:16:55PM -0700, Michael Smithng wrote:
> in write_frame():
> 	if return value is not negative, add size of data written (see above) to ost->actual_bytes_written.
> 
> in print_report():
> 	+ static int64_t  print_timebase = 1000000;   (set timebase of logged stats to 1 second)
> 	+ static int64_t  last_last_time = -1;
> 	+ double  elapsed_time;
> 	+ double  actual_time;
> 	+ double  actual_kBytes;
> 	+ double  actual_kbps;
> 
> when last_time is initialized, also initialize last_last_time.
> 
> when (cur_time - last_time) >= print_timebase,
> set last_last_time to last_time
> add print_timebase to last_time (this moves our timer forward by exact intervals)
> 
> if last_time still lags behind cur_time by more than print_timebase,
> set it to cur_time - print_timebase to catch it up rapidly.
> 
> then  elapsed_time = (double)(last_time - last_last_time) / 1000000.0;  (regularized time interval)
> 
> now for each output stream,
> calculate actual_kBytes = accumulated  actual_bytes_written / 1000.
> calculate actual_kbps = 8 * (actual_kBytes - (actual_prev_bytes / 1000.)) divided by elapsed_time.
> set actual_prev_bytes = actual_bytes_written.
> 

> print  kB= and kbps= (actual_kBytes and actual_kbps)  along with normal printed output.

unrelated to the bugfix and thus doesnt belong in the same patch as
the bugfix.

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

it is not once nor twice but times without number that the same ideas make
their appearance in the world. -- Aristotle
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