[FFmpeg-devel] ffmpeg print_report for rtmp streams

Michael Niedermayer michael at niedermayer.cc
Mon Nov 16 00:33:32 CET 2015

On Fri, Nov 06, 2015 at 10:16:51PM +0000, Tom Marecek wrote:
> Hello, I have no experience with submitting patches to ffmpeg yet and so I am sorry if I am going about this the wrong way but I wanted to discuss a change that I made to print_report which is related to this bug:  https://trac.ffmpeg.org/ticket/1446

1446 is about bitrate being 0, can you reproduce that ?

> We are using stdout from ffmpeg to monitor rtmp streams. Currently the FPS and bitrate numbers which print_report outputs are calculated as a running average - the total number of frames divided by the elapsed time and the total size in bits divided by elapsed time.
> This might make sense for files but for live streams it is not very useful since over time the changes in the streams are reflected less and less.
> My change is to output the actual frame rate and bit rate each time print_report is called (every half a second or so). Also instead of using the file size to calculate the bit rate, I use the sum of the data sizes written to each stream which is giving me more consistent numbers..
> Here is the diff, thank you for your feedback..

iam not sure what is the best solution but changing print_report
for your use case seems wrong

if you want to know the packet sizes and timestamps through moitoring
ffmpeg throug stdout, see check_keyboard_interaction()
there are features like packet hexdumps in there. An addition there
somewhere would be cleaner
or maybe you could add a bitstream filter that exports such packet
statistics by some means

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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