if (pos) {
throw ProgrammingError
(__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames at %2 (video is %3)", _audio.size(), pos->get(), _video.size()));
if (pos) {
throw ProgrammingError
(__FILE__, __LINE__, String::compose ("Butler audio buffers reached %1 frames at %2 (video is %3)", _audio.size(), pos->get(), _video.size()));