[clug] project, video editing,editing out ads

Scott Ferguson scott.ferguson.clug at gmail.com
Tue Apr 14 17:22:18 MDT 2015

On 15/04/15 00:35, Neil Pickford wrote:
> I also used Project X some 12 years back for a while until finding a
> commercial product called VideoReDo.
> VideoReDo has the Ad Detection technology looking for changes in scene,
> fades to/from black and audio levels.
> Unfortunately Ad detection just isn't accurate enough to use
> automatically and in the end swaps from cutting the ads to cutting the
> program and leaving the ads. (some ad breaks have Fade from black in
> middle!
> Manually marking the program with a good UI (keyboard shortcuts) I have
> found to be much faster and accurate.
> The station bugs are really good human tell-tales between ads and program.
> Each station is different and needs its signal to be analysed. Sometimes
> they leave markers in the vertical interval.
> At one stage Win had line 7 as a white line during remote program, I
> built a hardware detector for this to record Star Trek in the early
> morning for a while, but eventually it disappeared.

Someone else told me the same thing, and that they used a tone bar at
the start of each ad for setting sound levels. This is apparently no
longer the case.
I don't watch enough, and rarely watch something twice, to justify
manually editing as it'd take longer to mark and crop than to simply
fast forward through something. It'd also kill the novelty factor
because by the time I'd finish editing I'd have already watched it :(

At least now I can be confident that if the CLUG list hasn't found a way
then there most likely isn't a reliable method that I've simply
overlooked. No complaints though - for under $20 each these are great
devices for experimenting with sub-metre accuracy realtime GPS

>  Also sometimes the
> Ads from remote network would appear too using this method as they were
> marked.
> Cheers Neil VK1NP

Informative, thanks Neil.
Apropos of which - Japanese video recorders 'did' reliably remove ads
from recordings by detecting when language tracks vanished. Ads only had
a Japanese language track, content had subtitles and multiple language
tracks. (I've no idea whether Japanese TV hdd recorders currently do this)

I've had a bit of positive feedback from some about the idea of crowd
sourcing (or using Mechanical Turk) to subtitle style tag ads in
recordings (and fingerprint station logos) for a MusicBrainz-type
database - which could then be fed to ffmpeg and mplayer for final
editing. Now if someone would just steal the idea and implement it so I
could use *their* work... :)

> On 14/04/2015 9:13 PM, Scott Ferguson wrote:
>> On 14/04/15 18:46, Mike Carden wrote:
>>> I apologise in advance for derailing the thread and probably posting
>>> something that I may have mentioned here years ago. Nevertheless...
>> Interesting and informative detour Mike - and I'm sure it leads to
>> Linux, somewhere. ;)
>> Though it's a project that's well down the list of "things to do if I
>> get time" (and unlikely to ever get done) I would like to investigate
>> both the "perceived" loudness of television advertising - and the
>> difference between the number of languages/subtitling for the show and
>> advertising as method of auto-ad marking. Processes that are likely
>> simpler under Linux than any other OS.

Kind regards

"Ideas are worthless, time is not"

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