[FFmpeg-user] -t option in output parameter

[Axit Soni]

Hi Team,

Whenever I am passing -t option in Output Parameter like, 
*ffmpeg -r 30 -i <input_fifo> -c copy -t 10 output.mp4*

I am expecting that my output.mp4 should have "30 FPS * 10 Seconds = exact
300 Frames". but output.mp4 file have frames between "270 frames to 300
frames".

Any one knows this behavior than please let me know reason behind it. 

I also get information from another forum like, "-c copy option seeks thru
IFrames only"... Is this information is correct.

How can I make sure that My output.mp4 file with exact 300 frames. Am I
missing something or some parameter need to pass in ffmpeg command ?



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