File:Check64x48bwrg16pal 25fps.avi.026v10.stereo3levclicks.ogv
Check64x48bwrg16pal_25fps.avi.026v10.stereo3levclicks.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 14 s, 64 × 48 pixels, 85 kbps overall, file size: 148 KB)
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| Description |
English: Calibration audio video of four differently coloured 64x48 pixel sized frames in groups of 25, repeated to make 350 frames in total displayed in 14 seconds with a 120 beats per minute stereo audio click track (30 clicks in total). Each unique frame uses a 4 bit colour palette and contains four coloured rectangles in a checkerboard pattern. Each subsequent sequence of 25 frames the previous sequence's colours rotated 90 degrees clockwise.
English: This OGV file is intentionally made at 64 pixels wide by 48 pixels high and with a 4 bit colour palette in order to test media players. A correct media player with all post-processing disabled should play frames 1 to 25 over one second and then frames 26 to 50 for the next second and so on. Each coloured rectangle should appear completely black, completely white, completely red or completely green, and all edges should be sharp. The media player should also play all 30 clicks from the audio click track as follows (decibel figures are before normalisation):
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| Date | |
| Source |
English: self made in IrfanView 4.23, VirtualDub 1.9.8, ffmpeg2theora-0.26, Audacity 1.2.6 and oggz-tools
7Zip compressed archives of the source PNG files and intermediate AVI file are at [1] and [2] (7Zip decompressor needed). The oggz-tools command used to merge the video and audio together was:
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| Author | 84user |
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<-- left: rendered at the original size of 64 pixels; right: rendered at 128 pixels -->
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This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship. |  |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:02, 9 February 2010 | 14 s, 64 × 48 (148 KB) | 84user | {{Information |Description={{en|1=Calibration audio video of four differently coloured 64x48 pixel sized frames in groups of 25, repeated to make 350 frames in total displayed in 14 seconds with a 120 beats per minute stereo audio click track (30 clicks i |