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I have compiled meta2tile.c and got it working to make a lot of single tiles from the meta tiles directory.
But I would like to make an mbtile file. Could someone provide some examples on what syntax to use when running meta2tile to produce mbtile (hopefully without having to change the c code)?

I tried to do this:
./meta2tile --mbtiles /var/lib/mod_tile/default /media/test/tissd/mbtiles/wz12.db
that gives this error:
cannot create directory /media/tore/tissd/mbtiles/wz12.db/12: No such file or directory

So even if I use --mbtiles as parameter meta2tile still want to create single meta tiles inside a directory that does not exist - because the last part in the last parameter (wz12.db) is the target filename for the mbtile file to be created (and not an existing directory).

After some trail and error - I found some text inside the meta2tile.c file that said one must define WITH_MBTILES
So then I created a copy of meta2tile.c - named meta2mbtile.c and added:
#define WITH_MBTILES
compiled and run it without luck.
then I changed
static int mbtiles = 0
to
static int mbtiles = 1
and now it created an mbtile file without any other input from command line than meta-tile-dir and target file name:
like this:
./meta2mbtile /var/lib/mod_tile/default /media/test/tissd/mbtiles/wz12.db

and then the file reported creating same number of tiles as when creating single tiles. So far so good....
But by some reason the numbering in tile_row column in the wz12.db file is wrong.
zoom_level is set correct to 12
tile_column is set correct from 0 to 4095
tile_row is from 1248 to 3943 - but should have been from 158 to 2847

Is there something else I have to change i the c file to make it work to get the tile_row value (and corresponding tile_data) correct, or even better - if there was some examples on how to use the original file with some parameters when running it from command line - to produce mbtile.

Was using metat2tile for a while, but I have now a segfault on a new server (Debian Stretch).

$ ./meta2tile --verbose --bbox -5,42,8,51.5 --mbtiles /home/admin/Planet/tools/meta2tile_links/ /var/tmp/france_pistes_only.mbt

Converting tiles from directory /home/admin/Planet/tools/meta2tile_links/ to mbtiles file /var/tmp/france_pistes_only.mbt

opened '/var/tmp/france_pistes_only.mbt' for mbtiles output

Segmentation fault

Here is Valgrind output

opened '/var/tmp/france_pistes_only.mbt' for mbtiles output
==32139== Conditional jump or move depends on uninitialised value(s)
==32139== at 0x4C31CAE: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==32139== by 0x10A99A: ispng (meta2tile.c:159)
==32139== by 0x10BAEA: expand_meta (meta2tile.c:522)
==32139== by 0x10CC47: descend (meta2tile.c:830)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10D9D5: main (meta2tile.c:1174)
==32139==
==32139== Use of uninitialised value of size 8
==32139== at 0x4C31CF5: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==32139== by 0x10A99A: ispng (meta2tile.c:159)
==32139== by 0x10BAEA: expand_meta (meta2tile.c:522)
==32139== by 0x10CC47: descend (meta2tile.c:830)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10D9D5: main (meta2tile.c:1174)
==32139==
==32139==
==32139== Process terminating with default action of signal 11 (SIGSEGV)
==32139== Bad permissions for mapped region at address 0x824B384
==32139== at 0x4C31CF5: __memcmp_sse4_1 (vg_replace_strmem.c:1094)
==32139== by 0x10A99A: ispng (meta2tile.c:159)
==32139== by 0x10BAEA: expand_meta (meta2tile.c:522)
==32139== by 0x10CC47: descend (meta2tile.c:830)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10CC00: descend (meta2tile.c:824)
==32139== by 0x10D9D5: main (meta2tile.c:1174)
==32139==
==32139== HEAP SUMMARY:
==32139== in use at exit: 1,048,890 bytes in 4,017 blocks
==32139== total heap usage: 5,472 allocs, 1,455 frees, 1,479,546 bytes allocated
==32139==
==32139== LEAK SUMMARY:
==32139== definitely lost: 64 bytes in 1 blocks
==32139== indirectly lost: 0 bytes in 0 blocks
==32139== possibly lost: 4,104 bytes in 1 blocks
==32139== still reachable: 1,044,722 bytes in 4,015 blocks
==32139== of which reachable via heuristic:
==32139== length64 : 463,488 bytes in 186 blocks
==32139== suppressed: 0 bytes in 0 blocks
==32139== Rerun with --leak-check=full to see details of leaked memory
==32139==
==32139== For counts of detected and suppressed errors, rerun with: -v
==32139== Use --track-origins=yes to see where uninitialised values come from
==32139== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Segmentation fault

I have a problem with meta2tile. I have a tile server and I pre-generated the tiles with render_list command. When I run the meta2tile program, I got error messages:
"cannot detect image type in meta file var/lib/mod_tile/default/660/0/0/50/128.meta" Why?
And converted only 1 file in zoom level 0. I generated this tile when I tested the server.

The --noduplicate option would be very useful to reduce big mbtiles but when I add it to the command, I get the following error:

Cannot create map index: index map_index already exists

This error also happens when the mbtiles is already created, but even if I delete the mbtiles before executing I get it.

The full command is: ./meta2tile --noduplicate --mbtiles /var/lib/mod_tile/default ./foo.mbtiles

I could not find an option to make meta2tile create tiles with tilesize 512 instead of 256.
Could someone please tell me what to change in source to make it work like this?

I have compiled meta2tile.c and got it working to make a lot of single tiles from the meta tiles directory.
But I would like to make an mbtile file. Could someone provide some examples on what syntax to use when running meta2tile to produce mbtile (hopefully without having to change the c code)? After some trail and error - I found some text inside the meta2tile.c file that said one must define WITH_MBTILES
So then I created a copy of meta2tile.c - named meta2mbtile.c and added:
#define WITH_MBTILES
compiled and run it without luck.
then I changed
static int mbtiles = 0
to
static int mbtiles = 1
and now it created an mbtile file without any other input from command line than meta-tile-dir and target file name:
like this:
./meta2mbtile /var/lib/mod_tile/default /media/test/tissd/mbtiles/wz12.db

and then the file reported creating same number of tiles as when creating single tiles. So far so good....
But by some reason the numbering in tile_row column in the wz12.db file is wrong.
zoom_level is set correct to 12
tile_column is set correct from 0 to 4095
tile_row is from 1248 to 3943 - but should have been from 158 to 2847

Is there something else I have to change i the c file to make it work to get the tile_row value (and corresponding tile_data) correct, or even better - if there was some examples on how to use the original file with some parameters when running it from command line - to produce mbtile.