user11565: On latest GoPro 4 Silver with 64 GB
when i set 1080p 30fps i get estimated 4 hour recording time but when i double the framerate it not only does not shoren it actually increases so with 1080p 60fps it shows ~4.5 hour.
How is that?

user1871: The GoPro4 Silver model uses the same bitrate for 1080p-30 as 1080p-60 and hence the recording times are similar. This does mean that fewer bits are allocated per frame in the 60fps mode, although since the codec H264 uses inter-frame compression, the difference won't be as stark.

11565: <p>On latest GoPro 4 Silver with 64 GB</p>

<p>when i set 1080p 30fps i get estimated 4 hour recording time but when i double the framerate it not only does not shoren it actually increases so with 1080p 60fps it shows ~4.5 hour.</p>

<p>How is that?</p>
 1871: <p>The GoPro4 Silver model uses the <a href="https://gopro.com/support/articles/hero4-silver-recording-time-in-each-video-setting" rel="nofollow">same bitrate</a> for 1080p-30 as 1080p-60 and hence the recording times are similar. This does mean that fewer bits are allocated per frame in the 60fps mode, although since the codec H264 uses inter-frame compression, the difference won't be as stark.</p>
