Using ProRes 4444 allowed the rendering of this native resolution but FFmpeg could not scale it up much higher. This posed a problem as the HRIT full disks were already 5424x5424 pixels. The recommended workaround for this is to scale up the clip as much as possible before passing it to zoompan. The result is that the rate of zoom appears constant throughout the entire animation, whereas without the exponential interpolation the zoom would appear to start slowly at the first frame and end very quickly at the last.īecause the zoompan filter of FFmpeg rounds up or down the x and y values of the frame position, there can be a stuttering effect as the clip is moved. It produces a exponential zoom-out effect interpolating between the first and last frame. The first and last shots use the zoompan filter of FFmpeg following the function (exp(log($ZOOMFACTOR)+(log(1)-log($ZOOMFACTOR))*$FRAME/$TOTALFRAMES)) where the $ZOOMFACTOR is set to 16, $FRAME is the current frame in the video (”on” is used to denote this in FFmpeg) and $TOTALFRAMES is the total number of frames in the video to be zoomed.
The first shot is of ABI channel 07 with a histogram equalization applied via ImageMagick and the rest are unedited false color images made from channels 02 and 13 with a color lookup table. Adobe Premiere Pro CC was used to crop the full disk footage and speed it up by 2x. Full disk images between T0500Z and T0430Z were decoded with goesdump and rendered into ProRes 4444 video at 10 FPS. In addition, we have entered the spring eclipse season for GOES-EAST which causes stray beams of light to enter the Earth disk at local midnight.īash scripts were used to manipulate imagery from direct readout using ImageMagick and FFmpeg with a GNU Parallel semaphore for parallel processing. Full disk CMIPs for ABI channels 02, 07, and 13 were received despite multiple NOAA HRIT ground system anomalies causing degraded CMI products and data loss stemming from a firewall reboot. It is typical for one or more frames to be dropped throughout a 24 hour period due to any number of issues at any point along the data path. For the first time at the WX-STAR station, 7 days of continuous GOES-16 imagery has been recorded across multiple spectral bands over HRIT.