decoders.audio->Audio.connect (bind (&AnalyseAudioJob::audio, this, _1));
int64_t total_audio_frames = video_frames_to_audio_frames (_film->length().get(), _film->audio_stream()->sample_rate(), _film->source_frame_rate());
decoders.audio->Audio.connect (bind (&AnalyseAudioJob::audio, this, _1));
int64_t total_audio_frames = video_frames_to_audio_frames (_film->length().get(), _film->audio_stream()->sample_rate(), _film->source_frame_rate());