6a865a2265
Matroska container really really wants to internally keep on using
milliseconds as a time base. Even if at initialization time both the
m_stream and m_codecCtx are set to use {1, sample_rate} timebase,
later during the avformat_write_header call the audio stream gets set
to {1, 1000}.
Doing av_packet_rescale_ts for each packet after receiving it but
before writing it seems to do all the correct work. This is what is
being done inside Blender movie_write_audio.cc, and in official ffmpeg
mux.c example.
Pull Request: https://projects.blender.org/blender/blender/pulls/132872
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