[mythtv-users] Editing out commercials

[D Banerjee]

Sounds like you're missing the I frame after the next cut - mpeg is mpeg, if
your data stream starts on an I frame it should render correctly. When you
seek to I frame you may need to skip backwards one frame before making the
cut. Ontopic here - mythtv can already seek to keyframes in edit mode.
Should be pretty simple to write something that will simply concatenate
segments..

----- Original Message -----
From: "James L. Paul" <james at mauibay.net>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Tuesday, October 21, 2003 6:48 PM
Subject: [mythtv-users] Editing out commercials


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> Perhaps this is somewhat off-topic here, but Isuspect other MythTV users
> might have similar interests or experience doing what I want to do.
>
> Context:
> I'm only talking about MPEG2 here, specifically the streams that the
> PVR-250 and such spew forth. Has anybody here suggestions for removing
> commercials from recorded TV shows? I did this with various windows
> tools and MPEG1 for years under Windows, and haven't found any reliable
> tools in the past couple years of looking under Linux.
>
> Goal:
> Take a MPEG2 stream recorded by PVR-250 under MythTV, edit out
> commercials, result in a MPEG2 stream usable for CVD or DVD. I don't
> want to re-encode. I want to simply do GOP or I-frame cuts and get a
> valid usable stream. Demuxing/remuxing is tolerable if audio sync
> doesn't drift. Assume that the stream specs are already appropriate for
DVD.
>
> What I've tried recently:
> This week I tried avidemux, (and avidemux2, what's the difference?) but
> could not get anything usable at all. I tried GOPchop, and everything
> after the first cut is broken. I used mpgtx to demux the GOPchopped
> file, so I could try gop_fixup to fix the broken time indexes left by
> GOPchop, but gop_fixup didn't do anything at all, not even walk the file
> or change a single bit.
>
> I used mplayer to note all the in/out points of the commercial breaks
> and tried using mpgtx to split and join the file. Everything is broken
> after the first cut. I tried leaving all the segments unjoined but only
> the first segment was palatable to mplex and dvdauthor.
>
> What I ended up doing:
> I had one show on the History Channel I wanted to get to my parents
> right away, so I left all the commercials in and simply set chapter
> marks at the end of each commercial break. Not what I wanted to do at
> all. I used dvdauthor and mkisofs to generate the DVD ISO.
>
> Questions:
> Is there a tool (under Linux) that I've missed that can do I-frame or
> GOP cuts in an MPEG2 program stream and result in a correct and usable
> file? (GUI or not.)
>
> Is there something better than mplex to generate a DVD compatible MPEG2
> stream from element .m2v and .mp2 files? If not, is there a way to get
> mplex to NOT split the output file at the 2G limit? (Using "-S 0" simply
> doesn't do anything, it still wants to split the file.)
>
> Is there a tool better than dvdauthor for generating a DVD file
> structure from MPEG2 file(s)?
>
> Thanks for any advice!
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