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From: lee on 4 Jul 2010 10:40
Hi,

what do you use to automatically remove commercials from movies
recorded with a TV card? I know mythtv can do it, but I don't like
mythtv.


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From: Rob Owens on 4 Jul 2010 11:30
On Sun, Jul 04, 2010 at 04:34:43PM +0200, lee wrote:
> Hi,
>
> what do you use to automatically remove commercials from movies
> recorded with a TV card? I know mythtv can do it, but I don't like
> mythtv.
>
Personally, I'd just use MythTV. But if you want to do it yourself,
avidemux has a "next black frame" button. I know that's one of the
methods MythTV uses to detect commercials. This might get you started.

And if avidemux has this feature, mplayer/mencoder probably has it too.

-Rob


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From: lee on 4 Jul 2010 11:50
On Sun, Jul 04, 2010 at 11:21:40AM -0400, Rob Owens wrote:
> On Sun, Jul 04, 2010 at 04:34:43PM +0200, lee wrote:
> > Hi,
> >
> > what do you use to automatically remove commercials from movies
> > recorded with a TV card? I know mythtv can do it, but I don't like
> > mythtv.
> >
> Personally, I'd just use MythTV. But if you want to do it yourself,
> avidemux has a "next black frame" button. I know that's one of the
> methods MythTV uses to detect commercials. This might get you started.

The problem with avidemux is that it is unable to keep the sound
synchronized with the movie. So I'm using dvbcut which doesn't have
this problem. But it's tedious to cut out all the commercials manually
....

> And if avidemux has this feature, mplayer/mencoder probably has it too.

Hm, any idea how to make use of that? I couldn't find anything to that
in the manpage. It has even been impossible to create a channels.conf
for mplayer ...


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From: Rob Owens on 4 Jul 2010 13:10
On Sun, Jul 04, 2010 at 05:42:02PM +0200, lee wrote:
> On Sun, Jul 04, 2010 at 11:21:40AM -0400, Rob Owens wrote:
> > On Sun, Jul 04, 2010 at 04:34:43PM +0200, lee wrote:
> > > Hi,
> > >
> > > what do you use to automatically remove commercials from movies
> > > recorded with a TV card? I know mythtv can do it, but I don't like
> > > mythtv.
> > >
> > Personally, I'd just use MythTV. But if you want to do it yourself,
> > avidemux has a "next black frame" button. I know that's one of the
> > methods MythTV uses to detect commercials. This might get you started.
>
> The problem with avidemux is that it is unable to keep the sound
> synchronized with the movie. So I'm using dvbcut which doesn't have
> this problem. But it's tedious to cut out all the commercials manually
> ...
>
Yeah, I've had that trouble before.

MythTV runs a program called "mythcommflag". Maybe you could look up
the source or just get it to run standalone, without installing MythTV.

> > And if avidemux has this feature, mplayer/mencoder probably has it too.
>
> Hm, any idea how to make use of that? I couldn't find anything to that
> in the manpage. It has even been impossible to create a channels.conf
> for mplayer ...
>
This was just a guess, because I know avidemux is based on a lot of
mencoder code.

I just tried "mplayer -vf blackframe myfile" and it looks like it might
have output a list of frames that are black. I'm not 100% sure what I'm
looking at here, to be honest.

-Rob


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From: lee on 4 Jul 2010 15:00
On Sun, Jul 04, 2010 at 01:03:43PM -0400, Rob Owens wrote:
>
> MythTV runs a program called "mythcommflag". Maybe you could look up
> the source or just get it to run standalone, without installing MythTV.

As far as I understood, it works by creating some sort of index,
giving something like frame numbers telling other components of mythtv
to skip commercials or to cut them out. I never managed to get mythtv
to actually cut out commercials and was only able to skip them during
viewing.

> I just tried "mplayer -vf blackframe myfile" and it looks like it might
> have output a list of frames that are black. I'm not 100% sure what I'm
> looking at here, to be honest.


blackframe[=amount:threshold]
Detect frames that are (almost) completely black. Can
be useful to detect chapter transitions or commercials.
Output lines consist of the frame number of the detected
frame, the percentage of blackness, the frame
type and the frame number of the last encountered
keyframe.

<amount>
Percentage of the pixels that have to be below
the threshold (default: 98).

<threshold>
Threshold below which a pixel value is
considered black (default: 32).


Hmmmm ... Could be useful, but it just plays the movie. The manpage of
mplayer is pretty much unreadable, so I couldn't figure out how to
only filter the file and have the frame numbers printed. And then,
when I have such numbers, what do I do with them other than entering
them into dvbcut?


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