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

Helioseismic_and_Magnetic_Imager_First_Light_Briefing_320x180.ogv ‎(Ogg Theora video file, length 50 s, 320 × 180 pixels, 147 kbps, file size: 893 KB)

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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.

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 320 --height 180 --two-pass --videobitrate 140 --seek-index --theora-index-reserve 35 --output 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov_fr30_320x180_br140.ogv
  • Upload 445795main_Pesnell_2-HMI-instrumentanddissolve-H264_mov_fr30_320x180_br140.ogv as File:Helioseismic and Magnetic Imager First Light Briefing 320x180.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 320x180 and lower bitrate of 140 kbps

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
current18:14, 28 April 201050 s, 320 × 180 (893 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 Not ready Unknown status
Streaming 240p (VP9) 84 kbps Completed 21:17, 1 January 2024 9.0 s
WebM 360P 84 kbps Completed 12:56, 30 November 2023 3.0 s
Streaming 144p (MJPEG) 915 kbps Completed 15:24, 14 November 2023 2.0 s

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