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--- howto:merge-video [2024/03/04 21:29] – Wulf Rajek
+++ howto:merge-video [2025/08/23 21:31] (current) – Wulf Rajek
@@ Line 1: / Line 1: @@
 ====== Merge/Combine/Join Video ======
+GUI tool for mkv files. Older version is in default debian/ubuntu repositories, but latest can be installed in Mint 22 Wilma using the following, afterwards associate mkv files with mktoolnix:
+<code>
+sudo wget -O /etc/apt/keyrings/gpg-pub-moritzbunkus.gpg https://mkvtoolnix.download/gpg-pub-moritzbunkus.gpg
+cat <<EOF | sudo tee /etc/apt/sources.list.d/mkvtoolnix.list
+deb [arch=amd64 signed-by=/etc/apt/keyrings/gpg-pub-moritzbunkus.gpg] https://mkvtoolnix.download/linuxmint/ wilma main
+deb-src [arch=amd64 signed-by=/etc/apt/keyrings/gpg-pub-moritzbunkus.gpg] https://mkvtoolnix.download/linuxmint/ wilma main
+EOF
+sudo apt update
+sudo apt install mkvtoolnix mkvtoolnix-gui
+</code>
+{{.:pasted:20250823-213148.png}}
 MPG/MPEG files:
@@ Line 204: / Line 218: @@
 echo;read -rsn1 -p "Press any key to continue . . .";echo
 </code>
+Notes re subtitles:
+note: mp4 format does not support ass or srt subtitles, but mov_text subtitles. ffmpeg can convert them. formatting from ass subtitles will be lost.
+Embed srt subtitle file into mp4 as additional user-controllable track:
+<code>ffmpeg -i infile.mp4 -i infile.srt -c copy -c:s mov_text outfile.mp4</code>
+set metadata of first subtitle stream to english:
+<code>ffmpeg -i infile.mp4 -i infile.srt -c copy -c:s mov_text -metadata:s:s:0 language=eng outfile.mp4
+ffmpeg -i infile.mp4 -i infile.ass -c copy -c:s mov_text -metadata:s:s:0 language=eng outfile.mp4
+</code>
+extract subtitle from video:
+<code>ffmpeg -i Movie.mkv -map 0:s:0 subs.srt</code>
+Multiple subs require mapping, otherwise first sub will be overwritten
+First add another input: -i input2.srt. Second, map that as 2nd stream: -map 2:0. Finally, select encoder for 2nd subtitle stream (the same as the first one): -c:s srt. The complete example\ <code>ffmpeg -i input.mp4 -f srt -i input.srt -i input2.srt -map 0:0 -map 0:1 -map 1:0 -map 2:0 -c:v copy -c:a copy -c:s srt -c:s srt output.mkv </code>
+convert srt to ass or ass to srt:
+<code>ffmpeg -i input.srt input.ass
+ffmpeg -i input.ass input.srt
+</code>
+Remove audio from a video file:
+<code>
+ffmpeg -i input_file -c copy -an output_file
+# remove all but a specific language audio streams
+ffmpeg -i input_file -map 0 -map -0:a -map 0:a:m:language:fre -c copy output_file
+# loop to remove all but turkish audio streams:
+for f in *.mkv; do ffmpeg -hide_banner -i "$f" -map 0 -map -0:a -map 0:a:m:language:tur -c copy "${f%.*}.tur.mkv"; done
+</code>