opt_audio_codec  3584 ffmpeg.c               opt_audio_codec("mp2");
opt_audio_codec  3612 ffmpeg.c               opt_audio_codec("mp2");
opt_audio_codec  3634 ffmpeg.c               opt_audio_codec("ac3");
opt_audio_codec  3749 ffmpeg.c                   opt_audio_codec(tmp2);
opt_audio_codec  3859 ffmpeg.c           { "acodec", HAS_ARG | OPT_AUDIO, {(void*)opt_audio_codec}, "force audio codec ('copy' to copy stream)", "codec" },
opt_audio_codec  4061 ffserver.c                 audio_id = opt_audio_codec(arg);