File:Helioseismic and Magnetic Imager First Light Briefing 320x180 ffmpeg2theora-0.24.ogv

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Helioseismic_and_Magnetic_Imager_First_Light_Briefing_320x180_ffmpeg2theora-0.24.ogv (Ogg Theora video file, length 50 s, 320 × 180 pixels, 111 kbps, file size: 670 KB)

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 320 by 180 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. ffmpeg2theora version 0.24 was used to try to workaround the wikimedia theora thumbnail bug.

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:

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 320x180 and lower bitrate of 140 kbps

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

smaller 640x360 and lower bitrate of 500 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.)
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File history

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Date/TimeThumbnailDimensionsUserComment
current19:25, 28 April 201050 s, 320 × 180 (670 KB)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 240P 108 kbps Completed 04:21, 10 July 2024 25 s
WebM 360P 117 kbps Completed 12:56, 30 November 2023 3.0 s
QuickTime 144p (MJPEG) 959 kbps Completed 07:59, 31 October 2024 2.0 s

Metadata

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