ios - Get current video duration from CMSampleBufferRef -

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how can current recorded video duration cmsamplebufferref in delegate method

- (void)captureoutput:(avcaptureoutput *)captureoutput didoutputsamplebuffer:(cmsamplebufferref)samplebuffer fromconnection:(avcaptureconnection *)connection;

please guide sample code

the details need in video meta data. video meta data may need convert cmsamplebuffer cvpixelbuffer.

cmsamplebuffer core foundation-style opaque type; instance contains sample buffer frame of video data. cvpixelbuffer core video pixels sample buffer.

you can pixel buffer sample buffer using below cmsamplebuffergetimagebuffer:

cvpixelbufferref pixelbuffer = cmsamplebuffergetimagebuffer(<#a cmsamplebuffer#>);

once got pixel buffer can video meta datas timing , format informations.

to timing informations use cmsamplebuffergetpresentationtimestamp , cmsamplebuffergetdecodetimestamp respectively.

for more info read representations of media


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