[FFmpeg-devel] [PATCH]concatdec: measure duration when it is not available

[Bodecs Bela]

ping

2016.02.17. 14:13 keltezéssel, Bodecs Bela írta:
>
>
> 2016.02.16. 10:42 keltezéssel, Nicolas George írta:
>> L'octidi 28 pluviôse, an CCXXIV, Bodecs Bela a écrit :
>>> Do you have any suggestion for me what to do now?
>>> Please give me a hint where to find this bug or should I open a trac 
>>> ticket
>>> for it?
>> I already told you: find out exactly WHY the result is different. I 
>> suggest
>> you use this kind of test case:
>>
>> ffprobe -show_packets -show_streams input.ts
>> cat input.ts | ffprobe -show_packets -show_streams -
>>
>> When we know why, we can discuss how.
>>
>> Regards,
> I have checked the code where and when duration filled and made some 
> reasoning about it.
> Duration value for input files has been populated some time after 
> opening. (estimate_timings function in utils.c) And never again 
> corrected or called this function..
> So, if early in processing there is no duration info, it remains empty.
> When input is not a seekable file but a not-seekable stream, the only 
> chance to get a duration info  when the stream itself contains info 
> about this value. (eg. flv metadata, mp4-moov)
> But mpegts format does not contain this info. So the only moment when 
> duration calculatable is when we finish the reading. I think 
> contoniously updating the duration value after each packet would not 
> be a good idea.
> (cur_dts is updated is AVStream->info struct)
>
> So reading a file via pipe or reading hls stream via http it is normal 
> that duration value remains empty.
>
> thus, I think to handle the cases when duration value is not 
> populated, this is not a bug fix but a reasonable solution for these 
> cases.
>
> I agree with you that we should not "measure" our-own the pts values 
> but I could not find any existing/available data member to have this 
> info.
>
> best regars,
>
>
>>
>>
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