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Copyright (c) 2018-
Author: Chaitanya Tejaswi (github.com/CRTejaswi)    License: GPL v3.0+

Scraps

Language-agnostic, uncategorized content.

Index

Video Bookmarks

  • Partitioning a video using subtitles [VIDEO] [SUBTITLES]

    • Convert timestamps
    \[(\d{1,2}:)?(\d{1,2}:)(\d{1,2})\]
$1$2$3

([^:]{1})\b(\d{1,2}:)(\d{1,2})\b([^:]{1})
$1 00:$2$3$4
    • Make text bold/italic.
    ^([a-zA-Z\"]+)(.+)
<b> $1$2 </b>
<i> $1$2 </i>
    • Add font-color.
    ^([a-zA-Z\"]+)(.+)
<font color=#ff0000> $1$2 </font>
    • Capture timestamps; slice video
    (\d{1,2}:)(\d{1,2}:)(\d{1,2}) --> (\d{1,2}:)?(\d{1,2}:)(\d{1,2})

    $timings = (cat .\test.srt) -match "(\d{1,2}:\d{1,2}:\d{1,2}) --> (\d{1,2}:\d{1,2}:\d{1,2})"
$i=1; $timings | forEach {"ffmpeg -ss $($_.replace(' --> ',' -to ')) -i test.mp4 $i.mp4"; $i++} | Out-File -Encoding ascii trim.txt
cat .\trim.txt | powershell $_

When you label sections by making a subtitle follow the topic of discussion instead of individual dialogues (eg. 00:12:52 --> 00:15:20 = "I wanna be on the right side of history."), every subsequent watch can be limited to sections of the video when the subtitle is ON. You can even slice the videos into parts based on this (eg. ffmpeg -ss 00:12:52 -to 00:15:20 5.mp4). So, hour-long videos can be labelled, and only relevant discussions need to be watched. This is helpful for video-lectures.

NOTE:
Anything after the first timestamp is just written as is. No formatting. If the text doesn't start on the same line, it is skipped entirely. See fonts.conf

ffmpeg -i .\test.mp4 -vf subtitles=subtitle.srt test_.mp4