Hello,
A webtt subtitles files starts with a few header lines, and one of them
indicates the language:
==================================
WEBVTT
Kind: captions
Language: en
==================================
But ffmpeg won't detect the language. The ffprobe output on the above
file makes no mention of it:
==================================
Input #0, webvtt, from 'Star Trek Continues E01 ＂Pilgrim of Eternity＂
[3G-ziTBAkbQ].en.vtt':
Duration: N/A, bitrate: N/A
Stream #0:0: Subtitle: webvtt
==================================
Consequentely, when muxed into a video file, no language is reported for
the subtitle streams.
In constrast, MKVToolnix detects the language when reading a webvtt file
(although not always perfectly)
Is there a simple solution? I know it's possible to force a langage for
any stream, but in practice for each video file I have many subtitle
tracks to mux, and this is handled by scripts, so I'd prefer something
straigth and automatic.
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