File:Saturn ring spokes PIA11144 300px secs0to7.5 20080821.ogv

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Saturn_ring_spokes_PIA11144_300px_secs0to7.5_20080821.ogv ‎(Ogg Theora video file, length 7.5 s, 300 × 300 pixels, 55 kbps, file size: 50 KB)

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Description

Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera.

This animation is from the sequence taken on 21 August 2008: the first 7.5 seconds extracted from a concatenation of spoke movies acquired by NASA's Cassini spacecraft.

As Saturn nears equinox in August 2009 and the sun angle on the ring plane decreases, spokes become common sights in Cassini images, just as they were in Voyager images. The planet's orbital period is 29.5 years, so Saturn has nearly made one complete trip around the sun since the flybys of the two Voyager spacecraft in 1980 and 1981, allowing Cassini to closely match Voyager's viewing geometry.

This movie shows the sunlit side of the rings at low solar phase, or spacecraft-rings-sun, angles. The spokes appear dark against Saturn's B ring at low phase angles because the particles within them scatter light more efficiently in the forward direction (away from Cassini) than the surrounding larger ring particles. In the opposite viewing geometry, at high phase angles, spokes appear bright relative to surrounding ring particles.
Date 21 August 2008
Source http://photojournal.jpl.nasa.gov/catalog/PIA11144 (MOV video)
Author NASA/JPL/Space Science Institute
Other versions
  • 21 August 2008 sequence: 7.5 seconds at 300 pixels and low bitrate of 51kbps
  • 19 September 2008 sequence: 7 seconds at 300 pixels and low bitrate of 48kbps
  • 26 September 2008 sequence: 7.5 seconds at 300 pixels and low bitrate of 48kbps
  • 11 October 2008 sequence: 10 seconds at 300 pixels and low bitrate of 39kbps
  • 25 November 2008 sequence: 10 seconds at 300 pixels and low bitrate of 52kbps
  • 21 August 2008 sequence: 7.5 seconds at full size and bitrate of 528kbps
  • 19 September 2008 sequence: 7 seconds at full size and bitrate of 545kbps
  • 26 September 2008 sequence: 7.5 seconds at full size and bitrate of 471kbps
  • 11 October 2008 sequence: 10 seconds at full size and bitrate of 470kbps
  • 25 November 2008 sequence: 10 seconds at full size and bitrate of 372kbps
  • All five sequences together at full 1016×1016 pixels size: length 44s, 1,888kbps

Licensing[edit]

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Warnings:
Details of how videos were extracted and converted to Theora OGG format - click on the triangle to the left

PIA11144 video extracts from Cassini-Huygens timelapse series of Saturn's ring spokes.

Source: http://photojournal.jpl.nasa.gov/archive/PIA11144.mov linked from http://photojournal.jpl.nasa.gov/catalog/PIA11144

Start and end times of extracts from NASA movie: 

Seconds       large bitrate  small bitrate  Date sequence taken
 0   to  7.5  528 kbps       48 kbps        21 August 2008
 8   to 15    545 kbps       51 kbps        19 September 2008
15.5 to 23    471 kbps       48 kbps        26 September 2008
23   to 33    470 kbps       39 kbps        11 October 2008
33   to 43    372 kbps       52 kbps        25 November 2008
The original 44.5 second video was split into its five sections using ffmpeg2theora-0.25.exe, with options:
--videoquality 6 --inputfps 6 --framerate 6
Options starttime and endtime were used to select the section of the video to convert:
--starttime 33 --endtime 43
Options height and width were used to produce smaller versions downscaled to 300 pixels wide:
--height 300 --width 300

Original size conversions (1016 pixels wide, 1016 pixels high):

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --endtime 7.5 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_seconds1to7.5_20080821.ogv 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov':
 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].

 0:00:07.50 audio: 0kbps video: 528kbps, time elapsed: 00:00:07

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 8 --endtime 15 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_seconds8to15_20080919.ogv 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov':
 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].

 0:00:07.00 audio: 0kbps video: 545kbps, time elapsed: 00:00:06

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 15.5 --endtime 23 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_seconds15.5to23_20080926.ogv 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov':
 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].

 0:00:07.50 audio: 0kbps video: 471kbps, time elapsed: 00:00:06

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 23 --endtime 33 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_seconds23to33_20081011.ogv 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov':
 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].

 0:00:10.00 audio: 0kbps video: 470kbps, time elapsed: 00:00:10

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 33 --endtime 43 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_seconds33to43_20081125.ogv 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov':
 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].

 0:00:10.00 audio: 0kbps video: 372kbps, time elapsed: 00:00:09

Downscaled to 300 pixel width conversions:

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --endtime 7.5 --height 300 --width 300 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_300px_seconds0to7.5_20080821.ogv Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov': 

 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].
 Resize: 1016x1016 => 300x300
 0:00:07.50 audio: 0kbps video: 51kbps, time elapsed: 00:00:01

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 8 --endtime 15 --height 300 --width 300 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_300px_seconds8to15_20080919.ogv Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov': 

 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].
 Resize: 1016x1016 => 300x300
 0:00:07.00 audio: 0kbps video: 48kbps, time elapsed: 00:00:01

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 15.5 --endtime 23 --height 300 --width 300 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_300px_seconds15.5to23_20080926.ogv Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov': 

 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].
 Resize: 1016x1016 => 300x300
 0:00:07.50 audio: 0kbps video: 48kbps, time elapsed: 00:00:02

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 23 --endtime 33 --height 300 --width 300 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_300px_seconds23to33_20081011.ogv Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov': 

 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].
 Resize: 1016x1016 => 300x300
 0:00:10.00 audio: 0kbps video: 39kbps, time elapsed: 00:00:02

ffmpeg2theora-0.25.exe --videoquality 6 --inputfps 6 --framerate 6 --starttime 33 --endtime 43 --height 300 --width 300 --noaudio PIA11144.mov -o PIA11144_theora-0.25_q6_ifps6_fr6_300px_seconds33to43_20081125.ogv Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'PIA11144.mov': 

 Duration: 00:00:44.50, start: 0.000000, bitrate: 6933 kb/s
   Stream #0.0(eng): Video: h264, yuv420p, 1016x1016, 6 tbr, 600 tbn, 1200 tbc
 [audio disabled].
 Resize: 1016x1016 => 300x300
 0:00:10.00 audio: 0kbps video: 52kbps, time elapsed: 00:00:03

Tests:

Firefox 3.5.5 PASSES: it played each OGV correctly;
SUPER 2009.build.36 PASSES;
VLC (1.0.1 Goldeneye) PASSES;
MPC (Build: 1.1.796.0; MPC Compiler: VS 2005; FFmpeg Compiler: GCC 4.3.2) CRASHES;
MPC (Build: 1.3.1249.0; MPC Compiler: VS 2008; FFmpeg Compiler: GCC 4.3.3) COLOUR DEFECTS or BLACK, but does not crash;
MPC Version: 6.4.9.1 (revision 81) COLOUR DEFECTS, BLACK or CRASHES;
GOM FAILS;
Google Chrome 3.0.196.2 FAILS (despite claim in en:Theora).

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current18:20, 10 November 20097.5 s, 300 × 300 (50 KB)84user (talk | contribs){{Information |Description=Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera. This animation is from the sequence taken on

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Transcode status

Update transcode status
Format Bitrate Download Status Encode time
VP9 240P 37 kbps Completed 20:05, 18 October 2018 2.0 s
Streaming 240p (VP9) 38 kbps Completed 13:02, 6 December 2023 1.0 s
WebM 360P 60 kbps Completed 10:31, 2 December 2023 1.0 s
Streaming 144p (MJPEG) 239 kbps Completed 12:55, 16 November 2023 1.0 s

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