[FFmpeg-user] out_time_us wrong or strangely inaccurate

[Ferdi Scholten]

>
> How do I get the exact duration of a video file? Best would be of 
> course if every frame is marked with its correct timestamp.
>
Why not use ffprobe?

|ffprobe -v error -show_entries format=duration -of 
default=noprint_wrappers=1:nokey=1 |./recordedVideo.webm

webm containers also store the duration of the streams in the stream metadata so you can also just query the duration tag.