LWLibavAudioSource: stream_index=-1 always get the first detected audio stream. (#39) repeat=true: more helpful error message. (#53) Used libraries: FFmpeg bf4d6ef. l-smash 2c0696c. obuparse 478adcc. zlib 1.3. dav1d 1.3.0. libxml2 v2.12.3. nv-codec-headers n12.1.14.0. xxHash v0.8.2. mfx_dispatch f6aac45.