Username Privacy
- Unlike other messaging apps, Signal cannot easily see or produce the usernames of given accounts.
- Usernames in Signal are protected using a custom Ristretto 25519 hashing algorithm and zero-knowledge proofs.
echo "Done. Outputs: trimmed_fast.mkv, final_export.mp4"
ffmpeg -i jur153engsub.mkv -ss 02:00:06 -t 60 -itsoffset -0.5 -i subtitle.srt -c copy -c:s mov_text output_fixed.mp4 Here’s a ready-to-use bash script named convert_jur153.sh : jur153engsub convert020006 min
#!/bin/bash INPUT="jur153engsub_convert020006_min.mkv" START="02:00:06" DURATION=60 # seconds echo "Converting $INPUT from $START for $DURATION seconds" ffmpeg -i "$INPUT" -map 0:s:0 subtitles_eng.srt Trim video without re-encoding (fast) ffmpeg -ss $START -i "$INPUT" -t $DURATION -c copy "trimmed_fast.mkv" Create final version with burned-in subtitles ffmpeg -ss $START -i "$INPUT" -t $DURATION -vf "subtitles=subtitles_eng.srt" -c:v libx264 -c:a aac "final_export.mp4" echo "Done
In addition to other group attributes that are end-to-end encrypted (such as group names, group descriptions, and group avatars), the Signal service also doesn’t have access to any information about which accounts are part of a group, which accounts are admins in a group, which accounts can add new people to a group, which accounts can approve requests to join a group, or which accounts can send messages in a group.