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?
3
- I'm not sure why you would expect an increase in frame rate to result in a decrease in time. How would that work? The frame rate should have no effect on the duration -- recording an hour of video results in... an hour of video.Jim Mack– Jim Mack2015-09-02 18:18:15 +00:00Commented Sep 2, 2015 at 18:18
- 1He's assuming (not unreasonably) that more frames will occupy more disk space and hence result in a lower capacity.Gyan– Gyan2015-09-02 20:01:50 +00:00Commented Sep 2, 2015 at 20:01
- @Mulvya Ah, so "recording time" means "available capacity". Got it.Jim Mack– Jim Mack2015-09-02 21:09:05 +00:00Commented Sep 2, 2015 at 21:09
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1 Answer
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.
- Thanks that explains it, i assumed that it uses that even if i put on 30 frames, but i could not understand how could 30fps version have less capacity than 60fps, it actually got lower it didnt remain on the same number, i'd just see that on 30fps i can take like 30minutes less video, which is naturally strange :)vach– vach2015-09-03 18:44:13 +00:00Commented Sep 3, 2015 at 18:44