Sometime in the last six weeks I lost the ability to export audio, even after selecting quite a few different encoding options. This was on an updated testing install, however this morning I migrated to unstable and the problem persists. Using openshot --debug and doing a render gives me this:
[libx264 @ 0x7fac000029e0] [Eval @ 0x7fac39ffa500] Undefined constant or missing '(' in 'dct8x8' [libx264 @ 0x7fac000029e0] Unable to parse option value "dct8x8" [aac @ 0x7fac002caec0] [Eval @ 0x7fac39ffa4b0] Undefined constant or missing '(' in 'dct8x8' [aac @ 0x7fac002caec0] Unable to parse option value "dct8x8" [mp4 @ 0x7fac000024a0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead. on_frmExportVideo_destroy [consumer avformat] error writing flushed audio frame