[FFmpeg-user] [FFmpeg-devel] vstats info options

Kamaldeep Tumkur kamaldeep.tumkur at gmail.com
Wed Jan 4 09:55:46 EET 2017


I have been able to get accurate bitrate stats by using the
OutputStream's data_size structure in the print_report method.

total_size += ost->data_size; // For enc->codec_type

Progress reports now have valid size and bitrate for non-seekable
media. This is a fallback setting on total_size if it is still not
valid after avio_tell().

Does this seem ok? Is it preferrable to file a bug report or a commit
for review?


On Tue, Jan 3, 2017 at 8:13 PM, Kamaldeep Tumkur
<kamaldeep.tumkur at gmail.com> wrote:
> Hello,
> It appears that the progress information is more valid for 'seek'able
> media. But for live capture/encode, the frame_size and bitrate values
> are not valid. If there was access to the AVPacket structure or frame
> data at the time of sending the progress, we may have had reliable
> size and bitrate stats.
> Also lines 1560-1562 (ffmpeg.c v3.1.1)
>     total_size = avio_size(oc->pb);
>     if (total_size <= 0) // FIXME improve avio_size() so it works with
> non seekable output too
>          total_size = avio_tell(oc->pb);
> Is there another possiblility here? Could you shed some light on why
> the size is calculated based on seek lengths.
> Thanks
> Kamal
> On Mon, Jan 2, 2017 at 5:28 PM, Kamaldeep Tumkur
> <kamaldeep.tumkur at gmail.com> wrote:
>> Thanks for your suggestion on the use of progress. This is definitely
>> a user question. Though some further questions are:
>> frame=4866
>> fps=24.1
>> stream_0_0_q=32.0
>> bitrate=N/A
>> total_size=N/A
>> out_time_ms=202688000
>> out_time=00:03:22.688000
>> dup_frames=0
>> drop_frames=0
>> speed=   1x
>> progress=continue
>> There is no valid bitrate information. vstats always returns a valid
>> bitrate-per-frame and an avg-bitrate-per-sec value. Is there a way to
>> get the current bitrate consistently?
>> Are the assessments in the following ticket accurate?
>> https://trac.ffmpeg.org/ticket/5288
>> Going to look at having my application reliably use progress data.
>> Thanks
>> Kamal
>> On Mon, Jan 2, 2017 at 1:44 PM, Marton Balint <cus at passwd.hu> wrote:
>>> On Mon, 2 Jan 2017, Marton Balint wrote:
>>>> On Mon, 2 Jan 2017, Kamaldeep Tumkur wrote:
>>>>> Hello,
>>>>> Is there a possibility to provide the option to write vstats info from
>>>>> an encoding session remotely, say to another DB or to memory from
>>>>> where it can be handled by another process.
>>>>> The only possibility for consuming vstats info in real-time seems to
>>>>> be to have some kind of watch+notifier that will act upon
>>>>> modifications to the vstats log file. I want to be able to use these
>>>>> stats from a live encoding session for other purposes. Please suggest.
>>>>> Would you accept patches to ffmpeg.c so that it would provide more
>>>>> options to export the vstats info? Thanks for the time.
>>>> Have you checked the -progress <url> option?
>>> Also please respond on ffmpeg-user mailing list, as this question clearly
>>> belongs there.
>>> Thanks,
>>> Marton
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