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I am testing capability to switch between different audio or text tracks in a given stream (adaptive stream like HLS/Smooth/Dash). Could someone please provide sample video URLs with multiple audio tracks (Dolby, Stereo, DTS), audio language tracks (english, spanish, french) and text tracks (ex: subtitles in different languages)?

If not, is there a recommended tool to be able to combine audio or text tracks to a video file?

code
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This is old question but the answer may help someone coming here. You can check yamb for mixing videos and getting output in mp4 format:

https://www.videohelp.com/software/YAMB

If you want to get output in mkv,you can try mkvToolNix:

https://www.videohelp.com/software/MKVToolNix

Also, if you want to try ffmpeg,check(I haven't tested this):

https://ffmpeg.org/pipermail/ffmpeg-user/2013-May/015191.html

Paramveer Singh
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