[GRASS-user] Problem with zstd compressed rasters

[Micha Silver]

Hello all: I have some GRASS data that I share between different computers. The newer machine got updated recently to version 7.6.1, and rasters are by default compressed with zstd. The older machine (Linux Mint 18.3) was running 7.4 and (I think) did not support zstd. So those rasters created on the newer machine will no longer open on the older one. I updated to GRASS 7.6.1 (a word of thanks to the ubuntugis-unstable packagers!) and added the libzstd libraries, but still rasters created on the newer machine will not open on the older one. The difference between them is the version of libzstd. Is there a minimum required version of zstd?? On the old machine: micha@RMS ~ $ g.version GRASS 7.6.1 (2019) micha@RMS ~ $ zstd --version *** zstd command line interface 64-bits v1.3.1, by Yann Collet *** micha@RMS ~ $ r.univar slope WARNING: ZSTD compression error -2: Unknown frame descriptor ERROR: Error uncompressing raster data for row 2913 of <slope> micha@RMS ~ $ ldd /usr/lib/grass76/bin/r.univar | grep zstd     libzstd.so.0 => /usr/lib/x86_64-linux-gnu/libzstd.so.0 (0x00007fadf663c000) The new machine has zstd version 1.3.8, and everything works fine. But not on the old machine. Is my problem the difference in zstd versions? Thanks -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918

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