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File:Helioseismic and Magnetic Imager First Light Briefing 640x360 ffmpeg2theora 0.24.ogv

Helioseismic_and_Magnetic_Imager_First_Light_Briefing_640x360_ffmpeg2theora_0.24.ogv ‎(Ogg Theora video file, length 50 s, 640 × 360 pixels, 370 kbps, file size: 2.19 MB)

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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. 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.
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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 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.)
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File history

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Date/TimeThumbnailDimensionsUserComment
current19:13, 28 April 201050 s, 640 × 360 (2.19 MB)84user (talk | contribs)Helioseismic_and_Magnetic_Imager_First_Light_Briefing_320x180_ffmpeg2theora-0.24.ogv {{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 streng

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Transcode status

Update transcode status
Format Bitrate Download Status Encode time
VP9 360P 281 kbps Completed 14:17, 28 August 2018 38 s
Streaming 360p (VP9) Not ready Unknown status
VP9 240P 115 kbps Completed 14:17, 28 August 2018 32 s
Streaming 240p (VP9) 116 kbps Completed 21:17, 1 January 2024 1.0 s
WebM 360P 489 kbps Completed 17:20, 8 November 2012 49 s
Streaming 144p (MJPEG) 924 kbps Completed 15:25, 14 November 2023 2.0 s

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