On 05.01.2009 13:31, Artur Skawina wrote:
> Klaus Schmidinger wrote:
>> Detecting the frame rate is done by looking at the PTS values, so
>> it is independent of the actual broadcast system.
>>
>> Using this code for converting frame numbers into hh:mm:ss.ff...
>>
>> --------------------------------------------------------
>> #include <math.h>
>> #include <stdio.h>
>>
>> int main(void)
>> {
>> double FramesPerSecond = double(90000) / 3003;
>> //FramesPerSecond = 25;
>> for (int Index = 0; Index < 10000; Index++) {
>> double Seconds;
>> int f = round(modf(Index / FramesPerSecond, &Seconds) * FramesPerSecond) + 1;
>> int s = int(Seconds);
>> int m = s / 60 % 60;
>> int h = s / 3600;
>> s %= 60;
>> printf("%3d ", Index);
>> printf("%15.9f ", Index / FramesPerSecond);
>> printf("%d:%02d:%02d.%02d", h, m, s, f);
>> if (f > 30) printf(" *");
>> printf("\n");
>> }
>> }
>> --------------------------------------------------------
>>
>> ... sometimes results in a 31st frame:
>>
>> 9978 332.932600000 0:05:32.29
>> 9979 332.965966667 0:05:32.30
>> 9980 332.999333333 0:05:32.31 *
>> 9981 333.032700000 0:05:33.02
>> 9982 333.066066667 0:05:33.03
>>
>>
>> Any ideas how to fix this?
>
> eg
>
> - int f = round(modf(Index / FramesPerSecond, &Seconds) * FramesPerSecond) + 1;
> + int f = round(modf(Index / FramesPerSecond, &Seconds) * FramesPerSecond + 0.5 );
>
> note that some 'seconds' will contain only 29 frames. (see index 510 in the original
> and 1019 in the fixed version)
I'm afraid this isn't feasible. The '+1' is done to make the first frame
(at Index 0) have number '1'. With your change it would be numbered '0'.
Klaus
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