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player: accept compatible later FFmpeg library runtime versions 

mpv warned if the FFmpeg runtime library version was not exactly the
same as the build version. This seemed to cause frequent conflicts. At
this point, most mpv code probably adheres to the FFmpeg ABI rules, and
FFmpeg stopped breaking ABI "accidentally". Another source of problems
were mixed FFmpeg/Libav installations, something which nobody does
anymore. It's not "our" job to check and enforce ABI compatibility
either. So I guess this behavior can be removed.

OK, still check for incompatible libraries (according to FFmpeg
versioning rules), i.e. different major versions, or if the build
version is newer than the runtime version. For now.

The comment about ABI problems is still true. In particular, the
bytes_read field mentioned in the removed comment is still accessed, and
is still an ABI violation. Have fun.
This commit is contained in:
wm4 2019-10-11 21:28:04 +02:00
parent 9683617559
commit a85fa2d2de
2 changed files with 4 additions and 11 deletions
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3
common/av_log.c
View File

@ -210,7 +210,8 @@ bool print_libav_versions(struct mp_log *log, int v)
mp_msg(log, v, " %-15s %d.%d.%d", l->name, V(l->buildv));
if (l->buildv != l->runv) {
mp_msg(log, v, " (runtime %d.%d.%d)", V(l->runv));
mismatch = true;
mismatch = l->buildv > l->runv ||
AV_VERSION_MAJOR(l->buildv) != AV_VERSION_MAJOR(l->runv);
}
mp_msg(log, v, "\n");
}

12
player/main.c
View File

@ -385,19 +385,11 @@ int mp_initialize(struct MPContext *mpctx, char **options)
return 1; // help
if (!print_libav_versions(mp_null_log, 0)) {
// Using mismatched libraries can be legitimate, but even then it's
// a bad idea. We don't acknowledge its usefulness and stability.
// Distro maintainers who patch this out should be aware that mpv
// intentionally ignores ABI in some places where it's not possible to
// get by without violating it.
// Known API/ABI violations:
// - AVIOContext.bytes_read (demux_lavf.c)
print_libav_versions(mpctx->log, MSGL_FATAL);
MP_FATAL(mpctx, "\nmpv was compiled against a different version of "
MP_FATAL(mpctx, "\nmpv was compiled against an incompatible version of "
"FFmpeg/Libav than the shared\nlibrary it is linked against. "
"This is most likely a broken build and could\nresult in "
"misbehavior and crashes.\n\nmpv does not support this "
"configuration and will not run - rebuild mpv instead.\n");
"misbehavior and crashes.\n\nThis is a broken build.\n");
return -1;
}