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--- howto:subtitles [2025/02/01 23:09] – Wulf Rajek
+++ howto:subtitles [2025/07/26 18:41] (current) – Wulf Rajek
@@ Line 39: / Line 39: @@
 or
 Parameter:  {“action”:“subtitledelayplus”}
+===== Extract subtitles =====
+Extract subtitle with specific metadata title:
+<code>
+for f in *.mkv; do ffmpeg -hide_banner -i "$f" -c copy -map 0:s:m:title:"English [ForcedNarrative]" "${f%.*}.en.forced.srt"; done
+for f in *.mkv; do ffmpeg -hide_banner -i "$f" -c copy -map 0:s:m:title:"angličtina" "${f%.*}.en.srt"; done
+#extract 2 at once
+for f in *.mkv; do ffmpeg -hide_banner -i "$f" -c copy -map 0:s:m:title:"English [ForcedNarrative]" "${f%.*}.en.forced.srt" -c copy -map 0:s:m:title:"angličtina" "${f%.*}.en.srt"; done
+</code>
+===== Set subtitle to forced =====
+This copies the video and audio stream of an mp4 file, sets the first mov_text subtitle stream to 'forced' and the second to normal:
+<code>
+ffmpeg -i input.mp4 -vcodec copy -acodec copy -map 0:v:0 -map 0:a:0 -map 0:s:0 -c:s mov_text -disposition:s:0 forced -map 0:s:1 -disposition:s:1 0 output.mp4
+</code>
+For mkv files, this probably needs to be srt instead of mov_text.
+===== Remove subtitles from mkv files =====
+First, identify the track ids contained in the mkv file:
+<code>
+mkvmerge -i videofile.mkv
+</code>
+The output will look something like this:
+<code>
+kax i am at 6718
+File 'videofile.mkv': container: Matroska
+Track ID 0: audio (AC3/EAC3)
+Track ID 1: subtitles (SubRip/SRT)
+Track ID 2: subtitles (SubRip/SRT)
+Track ID 3: video (MPEG-4p10/AVC/h.264)
+Track ID 4: audio (DTS)
+Chapters: 17 entries
+Tags for track ID 0: 7 entries
+Tags for track ID 1: 7 entries
+Tags for track ID 2: 7 entries
+Tags for track ID 3: 7 entries
+Tags for track ID 4: 7 entries
+</code>
+For more detailed information the mkvinfo command can be used:
+<code>
+mkvinfo videofile.mkv
+</code>
+To create a new mkv file with the subtitles removed and only keeping the second audio stream, use the following command:
+<code>
+mkvmerge -o newvideofile.mkv -a 4 -s 0 videofile.mkv
+</code>
+To extract tracks from an mkv file, use the mkvextract command using the IDs obtained from mkvinfo:
+<code>
+mkvextract tracks videofile.mkv 2:subtitletrack2.srt 3:subtitletrack3.srt
+</code>