File:Helioseismic and Magnetic Imager First Light Briefing 640x360.ogv

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Helioseismic_and_Magnetic_Imager_First_Light_Briefing_640x360.ogv ‎(Ogg Theora video file, length 50 s, 640 × 360 pixels, 502 kbps, file size: 2.97 MB)

Captions

Captions

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Summary

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Description
English: NASA Caption: The Helioseismic and Magnetic Imager

The HMI will measure the waves rippling across the surface of the Sun and the strength and direction of the surface magnetic field. Wave data is used to create ultrasounds of the Sun, looking under the surface of the Sun to measure the winds that create the magnetic field. The magnetic field data is used to understand how the field erupts through the surface and becomes solar flares and coronal mass ejections, the storms of space weather.

This video is converted from the original video's frame rate of 60 to a slower frame rate of 29.97 and downscaled to 640 by 360 pixels which in turn allows a lower bitrate so that more computer users can replay it without pauses. Some artifacts are unavoidable during this conversion.

A H264 encoded version from the same source is at [1] on YouTube at various bitrates.
Date
Source

http://www.nasa.gov/mov/445795main_Pesnell_2-HMI-instrumentanddissolve-H264.mov linked from http://www.nasa.gov/mission_pages/sdo/news/briefing-materials-20100421.html

Converted as follows:

  • download 445795main_Pesnell_2-HMI-instrumentanddissolve-H264.mov from http://www.nasa.gov/mission_pages/sdo/news/briefing-materials-20100421.html
  • Use Avidemux to reduce framerate from 60000:1001 to 29.97:1 and remux to 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov.mp4
  • ffmpeg2theora-20100316/ffmpeg2theora.exe 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov_fr30.mp4 --width 640 --height 360 --two-pass --videobitrate 500 --seek-index --theora-index-reserve 35 --output 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov_fr30_640x360_br500.ogv
  • Upload 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov_fr30_640x360_br500.ogv as File:Helioseismic and Magnetic Imager First Light Briefing 640x360.ogv
Author NASA/Goddard Space Flight Center Scientific Visualization Studio
Other versions
full size at bitrate of 500 kbps

smaller 640x360 and lower bitrate of 500 kbps

smaller 640x360 and lower bitrate of 500 kbps using ffmpeg2theora-0.24

smaller 320x180 and lower bitrate of 140 kbps

smaller 320x180 and lower bitrate of 140 kbps using ffmpeg2theora-0.24

Licensing

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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:

File history

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Date/TimeThumbnailDimensionsUserComment
current18:11, 28 April 201050 s, 640 × 360 (2.97 MB)84user (talk | contribs){{Information |Description={{en|1=NASA Caption: The Helioseismic and Magnetic Imager The HMI will measure the waves rippling across the surface of the Sun and the strength and direction of the surface magnetic field. Wave data is used to create ultrasound

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Transcode status

Update transcode status
Format Bitrate Download Status Encode time
VP9 360P 165 kbps Completed 14:17, 28 August 2018 29 s
Streaming 360p (VP9) Not ready Unknown status
VP9 240P 88 kbps Completed 14:17, 28 August 2018 25 s
Streaming 240p (VP9) 89 kbps Completed 21:17, 1 January 2024 1.0 s
WebM 360P 478 kbps Completed 11:21, 14 November 2012 57 s
Streaming 144p (MJPEG) 921 kbps Completed 15:24, 14 November 2023 2.0 s

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

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