[FFmpeg-user] Question about using Webm/Matroska container in audio transconding

[Carl Eugen Hoyos]

2018-12-11 15:13 GMT+01:00, Ivan Zderadicka <ivan.zderadicka at gmail.com>:

> ffmpeg -i kapitola.mp3 -y -map-metadata 0 -map a -acodec libopus -vbr on
> -b:a 24k -compression_level 6 -cutoff 12000 -f webm pipe:1 > test1.webm

(Complete, uncut console output missing.)

If you use pipe output, it is impossible to update the file header
information with the actual file duration.

Carl Eugen