Wednesday, September 14, 2011

NEX-5N Video Overheating Test (Interesting! Plus Q Video Bit Rate Calculated)



Well, 22 minutes 23 seconds under an ambient temperature of 30 deg. C. seems to be a longish time. Btw, I just wonder how long would those Pentax cameras could last. The Q user manual states that the maximum recordable time length is in 25 minutes or 4GB in file size, as per P.112. But I just wonder if it will be overheated before this theoretical maximum limit is reached, as there is also a warning statement about high temperature cut under video recording in the same part of the manual (on the same page).

Besides, although it is not directly stated anywhere in the Q manual, the bit rate of the Q H.264/AVC in MP4 video is at about 21.33Mbits/s, which is calculated by dividing the 4GB with 25 minutes (4,000M x 8 bits / (25 x 60s)). This compressed data stream is of a higher bit rate than that of the NEX-7, which is in 16.4 Mbits/s (nominal) only, as lately revealed by someone. Do note that the Q has a higher frame rate at 30 fps versus the 25 fps of the NEX-7 (whilst NEX-5N does 60 fps at 1080p), nonetheless. So, would the P-Q has a higher video quality? Let's wait and see then!

Nevertheless, the P-Q video has two major fall-backs on paper already, one is that it can never auto-focus during video recording, the other is that it only records mono-sound (both are stated in the Q user manual also).

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