RiceHigh's Pentax Blog: NEX-5N Video Overheating Test (Interesting! Plus Q Video Bit Rate Calculated)

Wednesday, September 14, 2011

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

URL: http://www.youtube.com/watch?feature=player_embedded&v=fgqhc2ChIFg

Via: http://sonyalphanex.blogspot.com/2011/09/sony-nex-5n-video-overheating-test.html

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).

Previous Related:-

When Our Video DSLRs Have High Fever.. :-o ;->

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Ron Hendriks · 705 weeks ago

Well that not only heat's up pretty quick, but also drains the battery very fast. So for Nex-users I say keep some spare battery's on hand.

I did this summer some intensive long movie with my K-5. Just put it up on a youth international volleybalgame, The Netherlands against Spain. Just one take, on 720p25 and one star to get a max of some 22 minutes in duration.

First set: http://www.youtube.com/watch?v=uy2L8pNWR5s

Second set: http://www.youtube.com/watch?v=E9yezaZdt9Q
During this second set the red light alert got on after I think 10 minutes or so, but it didn't stop filming. There are also some short clips taken before this one, so in total I took almost 60 minutes of movie.

Looked at my second K-5's files and that says that the cameratemperature for still at the end of the game was 37 degrees of celsius.

I also did beachvolley this summer and on one event one camera was 40 degrees and the other was 41 degrees of celsius.

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Falk Lumo · 705 weeks ago

Rice, I am sorry to say but yiu missed the point here ...

Pentax (as most other vendors) specifies 25 min and 4 GB as independent limits (the real limit being defined by the barrier met first). The 25 min limit comes from the EU import duty policy, the 4 GB limit from the file system limitation. It makes no sense to divide both numbers. Absolute nonsense.

2 replies · active 705 weeks ago

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Mage · 705 weeks ago

Good point, Falk, and why we need real-world tests. It will be risky if we just believe Pentax seems to be suggesting in its material or its communications, e.g. Q will be like a DSLR in image quality, SDM failures never exist, shutter/mirror blur just imagined, and 11 AF points are all you need, ...

:)

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Michael A. · 705 weeks ago

Besides the chat "failed Pentax everything", how effected are you? Because I'm not at all - 2x K-5,K-x,K200D,ist*D,50-135 SDM and some very respectable glass....go figure, so much luck of one user...but again, my reference headset DENON AH-D5000 ($699.00) crapped up in about 6 weeks (still not back from warranty repair) . Must be made by Pentax too... :o)

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Jordan Drake · 705 weeks ago

I shot The Camera Store's Pentax Q video you have posted. The sound is stereo, you can see the two mic pickups on the front of the body. Checking the levels in my editing software, it is indeed stereo. This seems to be a typo in Pentax's literature and their stated spec list.

4 replies · active 705 weeks ago