I'm asking this as a meditation, because I don't expect any Perl (or other) code for that.

Questions:

• Is it possible to filter speech frequencies in a video with significant accuracy to identify the passages were people talk?
• Can the resulting pattern be used to synchronize a subtitle file, to match the gaps?

I'm looking for a low tech solution offering a handful of plausible adjustments to chose, not a speech recognition bazooka (like YT's auto-subtitles)

Background:

I'm often downloading foreign language movies and like to see them with original voice and subtitles to practice and learn vocabulary, but am often obliged to download and adjust the subtitles timing, because

• they are shifted, because of trailers or of "what happened last time" intros
• they are stretched, because of different frame rates
• they need readjustment in the middle because scenes were cut out

there are already Perl modules to fix the first two cases for .srt files.

That is, if the parameters are known. But finding them can be tricky.

FWIW: VLC offers an option for such synchros, but tends to freeze for a minute if the shift is in the area of 20 secs. No fun when trying out the best settings.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.