String::compose (
"Extra video frame inserted at %1s; source frame %2, source PTS %3 (at %4 fps)",
out_pts_seconds, video_frame(), source_pts_seconds, frames_per_second()
String::compose (
"Extra video frame inserted at %1s; source frame %2, source PTS %3 (at %4 fps)",
out_pts_seconds, video_frame(), source_pts_seconds, frames_per_second()