I'm pretty sure you shouldn't use approximate numbers (floats or
doubles) for this.
There's a bunch of AVRational related and exact-precision arithmetic
functions in libavutil for this purpose. see libavutil/mathematics.h
libavutil/rational.h.
On 29/06/12 21:51, Hector Alonso wrote:
Hi,
I've made myself one LibAvUtils class with this two functions
implemented like this:
int64_t LibAvUtils::frameNumberToPts(uint uiFrameNum, float fFps)
{
if (fFps <= 0) return 0;
return (int64_t)uiFrameNum * (int64_t)(((float)AV_TIME_BASE) / fFps);
}
//-----------------------------------------------------------------------------
uint LibAvUtils::ptsToFrameNumber(int64_t iPts, float fFps)
{
if (fFps <= 0) return 0;
return (uint)(iPts / (((float)AV_TIME_BASE) / fFps));
}
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