BAM!
Phil Whitmer
Joshua Tree Earth & Space Museum
----- Original Message -----
From: "Jodie Reynolds" <[email protected]>
To: "Steve Dunklee" <[email protected]>
Cc: <[email protected]>
Sent: Monday, February 25, 2013 11:01 PM
Subject: Re: [meteorite-list] two fireballs
Hello Steve,
I have more than 70 patents in the space in nineteen countries.
I'm the Chief Technology Officer for a company that designs and sells
digital video surveillance equipment -- I sell close to 30,000 systems a
year.
My masters degrees are in mathematics and electrical engineering with
an emphasis on optical physics, and I've been in the digital video
space inventing compression algorithms for more than two dozen years.
So, yeah, let's go ahead and investigate my "snow job", shall we?
Most cheap dash cameras being imported now are 1080p/30. 1080p/20 is a
favored option to maximize SD card usage. They differ from ATSC in
that they don't generally support 1080p/60.
For Example:
http://www.amazon.com/1080P-Dashboard-Camera-Accident-Vision/dp/B0099KGDQ2
http://www.rakuten.com/prod/new-real-hd-1080p-h264-5m-car-dashboard-camera-recorder-accident-dvr/225640553.html?listingId=174887992
http://www.espow.com/product_info.php?products_id=50672¤cy=USD&gsc=googleshopping&gclid=CMfrtJmH07UCFYKDQgodMSoAAQ
http://www.ebay.com/itm/Full-Car-DVR-HD-1080P-Cam-Recorder-Camcorder-Vehicle-Dashboard-Camera-F900LHD-/251182177426?pt=US_Surveillance_Digital_Video_Recorders_Cards&hash=item3a7b9fdc92
http://www.ebay.com/itm/Car-DVR-HD-1080P-Cam-Recorder-Camcorder-Vehicle-Dashboard-Camera-Hot-Sale-/330840799556?pt=US_Surveillance_Digital_Video_Recorders_Cards&hash=item4d07a5f944
http://www.ebay.com/itm/GPS-FULL-HD-1080P-Car-Camera-DVR-GPS-Logger-Vehicle-Black-Box-Video-Recorder-/320741840995?pt=US_Surveillance_Digital_Video_Recorders_Cards&hash=item4aadb41863
No dash cameras have been produced for public consumption at sub-D1
in at least five years. Mobile DVRs will often offer CIF for
multiple channel recording however (a limitation of the NTSC or PAL
scan converter).
640x280 is a non-existent format, as that would be 0.4375, not ending
on a byte boundary. You're thinking of 240 lines. And it wouldn't be
640 (square pixels), it would be 704. Or perhaps you're thinking of
SIF in a 525 line domain, which would be 352x240, or CIF in the 625
line domain (352x288).
The container format was, in fact, MP4. The codec used for
compression was AVC. AVC is aka MPEG4 AVC (Advanced Video Codec),
which is also known as h.264 **see below.
The original submitted video was 1080p. Youtube has offered 1080p
since 2009.
http://youtube-global.blogspot.com/2009/11/1080p-hd-comes-to-youtube.html
We can see the offered streams from youtube as/per:
http://www.spaceballoon.org/available-streams.jpg
There is no such video container or codec as "pmg" that I'm aware of -
Would you provide the FOURCC for that?
My stills are in PNG (Portable Network Graphics) as I noted
originally. __MPG__ is the Motion
Pictures expert Group [of which I've been a member off-and-on as well
as on several working groups over the years), and MPEG1, MPEG2, MPEG4, MPEG
AVC (aka h.264,
aka MPEG7 aka MPEG4 Layer 7, etc.) are all possible with additional
qualifications of things
such as differing levels of motion prediction, different transport
layers, and different containers.
Now, would you like to say anything else incredibly stupid, or would
you like to apologize for attacking me in your blind ignorance and we
can just let it go?
**Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 348 MiB
Duration : 10mn 1s
Overall bit rate mode : Variable
Overall bit rate : 4 860 Kbps
Encoded date : UTC 2013-02-14 04:06:40
Tagged date : UTC 2013-02-14 04:06:40
gsst : 0
gstd : 601210
gssd : BADC23F61HH1361841351562120
gshh : r1---sn-p5qlsn7z.c.youtube.com
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=40
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 10mn 1s
Bit rate : 4 714 Kbps
Maximum bit rate : 9 011 Kbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 20.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.114
Stream size : 338 MiB (97%)
Tagged date : UTC 2013-02-14 04:06:50
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 10mn 1s
Bit rate mode : Variable
Bit rate : 144 Kbps
Maximum bit rate : 150 Kbps
Channel(s) : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 10.3 MiB (3%)
Encoded date : UTC 2013-02-14 04:06:48
Tagged date : UTC 2013-02-14 04:06:50
Monday, February 25, 2013, 6:43:34 PM, you wrote:
HI Yall
I have a problem with this paragraph.
The following is my disassembly of that video with strictly the
relevant frames. No post-processing has been done, simply brought
the original MP4 container down, decompressed the 1920x1080p/20fps
transport into raw 8bit 4:2:0 YUV frames [the native frames], and
mapped them into lossless 24bit PNGs.
Most dash cams are 15fps and 640x280 not 1080p hd high resolution.
especially considering the highest resolution youtube uses is 720p.
Nice snow job. was pmg not mp4
Cheers Steve
--- On Tue, 2/26/13, Jodie Reynolds <[email protected]> wrote:
From: Jodie Reynolds <[email protected]>
Subject: Re: [meteorite-list] two fireballs
To: "Chris Peterson" <[email protected]>
Cc: [email protected]
Date: Tuesday, February 26, 2013, 1:51 AM
[Note: frame references refer to my
attached disassembly]
Hello Chris and all,
I agree: I don't see any impact event, certainly no
shockwave is visible in
the bright frames.
I see the object of interest traveling away from the camera
on a
steep angle and, between blooming and DCT errors, obscuring
itself.
The digital iris tries its darndest to figure out what to do
with
itself, and actually makes some pretty good decisions around
frame 63
giving us some pretty nice images.
There certainly does appear, however, to be more than one
parallel
path suggesting more than one component of the mass by frame
65/66. There's also some
pretty good sized component being shed earlier.
Chris, have a look at frames 64-80 in this disassembly to
see if you
concur.
The following is my disassembly of that video with strictly
the
relevant frames. No post-processing has been done,
simply brought
the original MP4 container down, decompressed the
1920x1080p/20fps
transport into raw 8bit 4:2:0 YUV frames [the native
frames], and
mapped them into lossless 24bit PNGs.
The video as I pulled it is an MPEG 4.2 container with AVC,
High L4.0 Profile, VBR @
4.714-9.011Mbps, 20fps constant, progressive 4:2:0 YUV 16:9
encoding.
One reframe, GOP M=1,N=40.
The original timecode is branded: UTC 2013-02-14 04:06:50,
but
there's no way of knowing how accurately the DVRs clock was
maintained.
105 frames contained, ~102MB here:
http://www.spaceballoon.org/chelyabinsk-meteor-frames-from-dash.zip
"Fair Use" is assumed, and all rights are retained by their
original
holder.
Best Regards,
--- Jodie
Monday, February 25, 2013, 5:05:46 PM, you wrote:
> You are confusing optical aberrations for what is
happening physically.
> Not only are there no components of the fireball
colliding with other
> components, but no shock wave structures are apparent,
either.
> Analyzing very bright point sources in video is
difficult, as there are
> lens reflections, lens distortion, and various sensor
artifacts. It's
> hard to actually locate the center of the meteor from
such data.
> Chris
> *******************************
> Chris L Peterson
> Cloudbait Observatory
> http://www.cloudbait.com
> On 2/25/2013 5:56 PM, Steve Dunklee wrote:
>> http://www.youtube.com/watch?feature=endscreen&v=dBvotWfR3j4&NR=1
>> 26 seconds in on this video you clearly see two
fireballs with the second one catching up to and impacting
the first one.
>> The first one makes a shockwave
and area behind it with less air pressure. the shock wave at
over 10k mph is like a brick wall and acts like a funnel.
Like following an 18 wheel semi truck too close to save gas.
when the truck hits its brakes the suv behind it impacts.
and kaboom. Meteors donT HAVE BRAKES AND CANT CHANGE
VECTORS. So when the first piece is slowed down the
following ones catch up.
>> Cheers
>> Steve Dunklee
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--
Best regards,
Jodie
mailto:[email protected]
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--
Best regards,
Jodie mailto:[email protected]
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