libebml | a C++ library to parse EBML files | Parser library

AVI is not meant to be used with HEVC.
Use a modern output container format such as MP4, MOV, or MKV.

A workaround is to add the -vtag hvc1 output option.

I figured out a way to make this work so I'll share what code is working for me.

... _liborwell/_libopenvpn3/openvpn3/libssl.a _liborwell/_libopenvpn3/openvpn3/libcrypto.a -lpthread _liborwell/_libopenvpn3/openvpn3/liblzo.a, - based on this sequence of libraries in the compiler command my best guess would be that you have a dependency on OpenSSL somewhere (in ${ORWELL_ANDROID_PROJECT_ROOT}/liborwell/ORWELL_INCLUDES.cmake?), which is probably configured to use pthreads. According to the description of its configuration system, it can be configured not to use threading at all:

[2] OpenSSL is built with threading capabilities unless the user specifies no-threads. The value of the key thread_scheme may be (unknown), in which case the user MUST give some compilation flags to Configure.

The problem with your regex is that the second ^General absorbs those characters and prevents them matching on the second group. Also I'm not sure what you are trying to achieve with [\s] as that will match any space character when not matching the first part of the regex. I think what you actually want is to use a positive lookahead for General at the start of the line (or end of string) i.e.