|2007-9-15||Crash||7Mb theora; 6Mb mpeg1||one entry|
|2007-9-10||Tailgating by taxi SF07 DFK||7Mb theora; 7Mb mpeg1||one entry|
|2007-9-10||Cut up by taxi LV04 NZT||11Mb theora; 10Mb mpeg1||one entry|
|2007-9-10||Tailgating by and collision with N99 JHC||24Mb theora; 21Mb mpeg1||one entry|
|2007-9-10||Tailgating by M843 GFL on Mill Road bridge||9Mb theora; 7Mb mpeg1||one entry|
|2007-8-29||Considerate drivers in Stowmarket||12Mb theora; 11Mb mpeg1||one entry|
|2007-8-22||EA04 UXJ cuts us up, driver is abusive||11Mb theora; 10Mb mpeg1||one entry|
|2007-8-13||Tailgating and close passing by taxi FH51 BJU||6Mb theora; 6Mb mpeg1||one entry|
|2007-8-1||Tailgating by L611 JEG||11Mb theora; 10Mb mpeg1||one entry|
|2007-8-1||Narrow bike lanes on East Road||5Mb theora; 5Mb mpeg1||one entry|
|2007-7-30||KN51 TXU pulls out forcing me to swerve and brake||10Mb theora; 9Mb mpeg1||2 entries||2007-8-1 Reported to police|
|2007-7-30||Close passing by taxi no.86 OV04 CLJ||3Mb theora; 3Mb mpeg1||one entry|
|2007-7-30||Dooring zone bike lane considered harmful||4Mb theora; 3Mb mpeg1||2 entries||2007-7-31 References to CCyC comments when lane painted|
|2007-7-3||Bus and bike lanes used by Smart car & G424 OFL||3Mb theora; 3Mb mpeg1||one entry|
|2007-7-2||POB fails to keep left; dippy pedestrians||4Mb theora; 4Mb mpeg1||one entry|
|2007-7-2||T809 DLW pulls out without looking||10Mb theora; 9Mb mpeg1||one entry|
|2007-7-2||Barging in a residential street||4Mb theora; 3Mb mpeg1||one entry|
|2007-7-1||M533 TPU pulls out without looking||5Mb theora; 5Mb mpeg1||one entry|
|2007-6-28||Barging and intimidation by X584 EGF||5Mb theora; 5Mb mpeg1||one entry|
|2007-6-11||Pavement parking||11Mb theora; 8Mb mpeg1||one entry|
|2007-6-11||Close passing by SC56 XVZ||4Mb theora; 4Mb mpeg1||3 entries||2007-6-13 Police will use as `intelligence'|
|2007-5-22||Dangerous passing, cycle lane violation by KJ03 GNX||39Mb theora; 38Mb mpeg1||one entry|
|2007-5-21||Tailgating by taxi PN56 TXX||26Mb theora; 24Mb mpeg1||3 entries||2007-5-29 Driver given `words of advice'|
|2007-5-21||Undertaking in bus lane by K326 DRF||5Mb theora; 5Mb mpeg1||one entry|
|2007-4-30||Close passing by H748 FMJ, threats||29Mb theora; 29Mb mpeg1||3 entries||2007-4-30 Police visited, took videos|
|2007-4-30||Post van BU04 WKH on pavement, bike lane||one entry|
|2007-4-30||POB Mitcham's Corner wrong way||3Mb theora; 3Mb mpeg1||one entry|
|2007-4-30||Haart's CE54 UKF on pavement, bike lane||8Mb theora; 8Mb mpeg1||one entry|
|2007-4-29||Close passing at speed by L434 XFW||5Mb theora; 5Mb mpeg1||2 entries||2007-4-29 Reported to police|
|2007-4-27||Traffic island, KU51 RXF cuts me up||15Mb theora; 13Mb mpeg1||one entry|
Trouble viewing the videos? Wikipedia has useful instructions. (Wikipedia page `Media help (Ogg)' retrieved Mon, 30 Apr 2007 15:19:28 +0100.)
Calibration video giving distances in metres as 3.6Mb theora; 4Mb mpeg1.
The photos show the cameras attached to the bike.
The two videos (the .ogg files) show my journey from Gilbert Road to the Parker's Piece corner at the end of Regent Terrace, in the light, and back again, in the dark. Nothing very unusual happens in these videos, so don't bother watching them for the excitement.
The chief difficulty is that the field of view is rather narrow. Many events of interest may occur outside it, especially hazards from the sides. It also gives the impression that things (particularly, vehicles) are much closer than they really are.
The strange jelly-like effect (most visible on the front camera when going over bumps) appears to be caused by the camera not capturing the whole frame at a single instant: so, as the camera moves up or down, objects are vertically squashed or stretched. I was able to reduce this problem from initially unmanageable distortion by greatly increasing the rigidity of the front camera mounting.
At night the imagery is very poor in all but the best-lit streets and my own front light is evidently not strong enough to help this much.
The audio track is nearly useless. In the example videos there are a couple of occasions where I shout warnings to other road users, which are barely audible let alone intelligible. In contrast, brake squeal and road noise are very loud.
Using the camera to record registration plate numbers will be difficult unless the lighting conditions are good and the distances small, and because the audio track is so useless merely calling out the number won't help. I'll have to keep to pencil and paper.
The cameras produce .avi files containing a pile of individual .jpeg frames and an uncompressed 8-bit 8khz u-law soundtrack. I have a script which postprocesses a pair of .avi's into a single ~220kby/s .ogg (vorbis audio plus theora video) stream.
The script (written in bash) uses:
This software is available for download. It is in source form only and not very well documented so you will need to be a reasonably competent user of the Unix command line to make use of it. The dependencies are all satisfiable using packages only from Debian etch main.
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