Date: Tue, 29 May 2007 11:08:17 -0500 From: "Rick C. Petty" <rick-freebsd@kiwi-computer.com> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: multimedia@freebsd.org Subject: Re: GOPchop replacement? Message-ID: <20070529160817.GA36030@keira.kiwi-computer.com> In-Reply-To: <20070529095305.f41v1an4cg4g48wc@webmail.leidinger.net> References: <20070527.223709.-201313103.imp@bsdimp.com> <20070529024231.GB20870@keira.kiwi-computer.com> <20070529095305.f41v1an4cg4g48wc@webmail.leidinger.net>
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On Tue, May 29, 2007 at 09:53:05AM +0200, Alexander Leidinger wrote: > > >So I use avidemux2 to mark the cut spots, save the project, and I have a > >python program which converts avidemux2 project files into dvbcut project > >files. I've also been requantizing the video to DVD quality because my > >tuner card records at broadcast quality MPEG2 (15 Mbit/s) which is too high > >for DVD.. For this, I use another python script which uses a combination > >of mpgtx, lame, ffmpeg, transcode, and mjpegtools and also converts the MP2 > >into AC3. > > MP2 (MPEG audio Layer 2) -> AC3? > > At which AC3 bitrate? If it is not lower than the MP2 bitrate, this > conversation is worthless. Sorry-- I meant mp3, and yes it's lower (384 vs 192), and even still it would not be worthless... DVD players are required to support AC3, but MP2/MP3 support is *optional*. So if you're going for compatibility, it's noth a worthless conversion. > Why lame when you convert to AC3? Not sure. I'm using ffmpeg to do the conversion, and I took the WAV step from another script I found online. IIRC, I think I had A/V sync issues unless I followed these precise steps. > Is recode integrated into transcode/ffmpeg? If not, maybe it worth to > give it a try, it's a requantizer and doesn't need to decode and then > reencode. AFAICT transcode does a decode/reencode and I noticed the quality loss. Ffmpeg is supposed to be smarter about it and avoid the decode if unnecessary, but I had A/V sync problems or DVD-player problems. The steps I perform seems to work for me-- from pvr500 tuner to compliant DVD player. YMMV, -- Rick C. Petty
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