[FFmpeg-devel] [Bugreport] and [Patch]: duration of TS streams is wrong when used near 2^33 wrap

Thorsten Jordan tjordan
Mon Oct 29 17:36:57 CET 2007

Michael Niedermayer schrieb:
> Hi
> On Mon, Oct 29, 2007 at 04:52:52PM +0100, Thorsten Jordan wrote:
>> Rich Felker schrieb:
>>> On Mon, Oct 29, 2007 at 01:01:38PM +0100, Michael Niedermayer wrote:
>>>>> I'm inclined to say that rather than trying to guess the unknown, we should
>>>>> simply report the duration of these files as unknown.
>>>> yes, fully agree
>>> Me too. I'm inclined to always agree with this principle. Returning
>>> guesses in fields documented as providing reliable information is very
>>> bad.
>> following that argumentation, the current implementation to compute
>> duration would have to be removed too, because it is a guess as well, as
>> Mans said. But who would want that?
>> The proposed change wouldn't make the current situation much worse imho,
>> but ok, it is your decision.
> the change makes the code worse
> as it turns negative durations (which would be ignored) into valid positive
> ones, in practice such negative durations are more likely caused by
> timestamp resets instead of 33bit wraping
Sorry, but i doubt that this is the case. PTS wrap occurs every 26.5
hours, but how often do PTS resets occur? In fact i never saw one yet
and i am working much with TS of TV broadcasts. They may happen, but
surely less often than simple wraps.

Greetings, Thorsten

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