Re: [Mjpeg-users] difference -f 5 -f 8
Hi Al, > So the difference you see, is: > -q -4 2 -2 3 > > I use different -q values with different sources. But does it make > sense to use -4 2 -2 3 for encoding DVDs from dv-camera-sources? The -4 and -2 flags just control how exhaustively the motion estimator searches for good motion compensation. Basically, the lower the number the fewer unlikely Candidates are discarded without detailed examination. The gains in compression from cranking -4 and -2 right down are pretty marginal for most material. More a case of "I don't care if it compresses overnight, so which not". If encoding time matters to you don't bother winding them down low. Andrew --- This SF.net email is sponsored by: The Definitive IT and Networking Event. Be There! NetWorld+Interop Las Vegas 2003 -- Register today! http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] difference -f 5 -f 8
On Freitag, 21. März 2003 19:48 Bernhard Praschinger wrote: > > So I can use the same parameters as -f 8 sets with -f 5? If so, > > which parameters and values you have to use? > > Likely, but they might not makes sense. > > The -f 5 setes the options to produce a svcd compliant. But you > are alowed to change everything. The -f 8 sets the options to > produces something suitable for a DVD-Player. > > Maybay I have forgotten it, but why do you want to do that. It > makes no reall sense to me. Berni, it is very easy to understand. I don't copy DVDs, but make own films from my dv-camera. There are two things, which are very important to me: high quality and the possibility to create DVDs from my XSVCDs later *without* reencoding and having other unexpected problems. As long as my standalone-DVD-players accept the XSVCD with DVD parameters I think -f 8 is the securest way to get no problems later, when I make a DVD from the mpg-file of the XSVCD. With a videobitrate of 5000kbps I can make a film with about 23min. That's enough for me. Most of my clips are about 10min. and then I use 6000kbps VBR. A simple command: transcode -i /multimedia_out_nfs/encodesource3/ -V -y mpeg2enc,toolame -F 8 -o test used the following default values: [export_mpeg2enc.so] cmd=mpeg2enc -v 0 -f 8 -b 1800 -F 3 -n p -o "test".m2v and transcode -i /multimedia_out_nfs/encodesource3/ -V -y mpeg2enc,toolame -F 5 -o test created: [export_mpeg2enc.so] cmd=mpeg2enc -v 0 -q 3 -f 5 -4 2 -2 3 -b 1800 -F 3 -n p -V 230 -o "test".m2v So the difference you see, is: -q -4 2 -2 3 I use different -q values with different sources. But does it make sense to use -4 2 -2 3 for encoding DVDs from dv-camera-sources? Al --- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] difference -f 5 -f 8
On Thursday 20 Mar 2003 7:16 pm, you wrote: > man mpeg2enc says: > >-f|--format 5 -Non-standard SVCD. >As for profile 4 but bit-rate, video buffer size, GOP >sizes and structure can be set to non-standard values. >Frame size may also be non-standard. > >-f|--format 8 -DVD MPEG-2. >Just a very basic implementation. > > It works fine to crete a vob-file from a mpeg/m2v-file, which was > created with -f 5. So what is the difference between -f 5 and -f 8? > > Are there parameters which can be set with -f 5 manually and are > created with -f 8 by default? > > Which GOP is used with -f 8? Is -s a default value for -f 8? I read, > that authoring programs (Win) need -s to accept the file. If you look for the string SVCD and DVD in the source code you'll see the exact differences that are set! Basically, SVCD inserts stuff needed for SVCD DVD for DVD and there are some differences in the way system headers are constructed. However, since its all MPEG-2 a *well-written* MPEG-2 decoder should be able to handle both. Software decoders can usually handle almost anything (they mostly ignore the more-or-less redundant header infos anyway). Alas, you typical set-top DVD/SVCD player is rarely a well-written MPEG-2 decoder. Usually slightly flaky and only tested on a limited range of streams and go nuts if they hit optional headers they don't expect or similar. Andrew --- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] difference -f 5 -f 8
Hallo > > If you use -f 5 you are allowed to set most of the parameters on > > your own. > So I can use the same parameters as -f 8 sets with -f 5? If so, > which parameters and values you have to use? Likely, but they might not makes sense. The -f 5 setes the options to produce a svcd compliant. But you are alowed to change everything. The -f 8 sets the options to produces something suitable for a DVD-Player. Maybay I have forgotten it, but why do you want to do that. It makes no reall sense to me. > -w 8500 ? > -g 15 -G 15? -w <-> -b ??!?!?? > > The -f 8 sets a other sequence length by default and a maximal > > video bitrate of 8500, other gope Size. > > What do you mean with "sequence length"? Do you mean GOP? Try: > man mpeg2enc /sequence length No, the sequence length cares about the marking a suitabel point of the stream where mplex can split the output stream into several files. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard --- This SF.net email is sponsored by:Crypto Challenge is now open! Get cracking and register here for some mind boggling fun and the chance of winning an Apple iPod: http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0031en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] difference -f 5 -f 8
On Donnerstag, 20. März 2003 20:17 Bernhard Praschinger wrote: > If you use -f 5 you are allowed to set most of the parameters on > your own. So I can use the same parameters as -f 8 sets with -f 5? If so, which parameters and values you have to use? -w 8500 ? -g 15 -G 15? > The -f 8 sets a other sequence length by default and a maximal > video bitrate of 8500, other gope Size. What do you mean with "sequence length"? Do you mean GOP? Al --- This SF.net email is sponsored by: Tablet PC. Does your code think in ink? You could win a Tablet PC. Get a free Tablet PC hat just for playing. What are you waiting for? http://ads.sourceforge.net/cgi-bin/redirect.pl?micr5043en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] difference -f 5 -f 8
Hallo > man mpeg2enc says: >-f|--format 5 -Non-standard SVCD. >As for profile 4 but bit-rate, video buffer size, GOP >sizes and structure can be set to non-standard values. >Frame size may also be non-standard. > >-f|--format 8 -DVD MPEG-2. >Just a very basic implementation. > > It works fine to crete a vob-file from a mpeg/m2v-file, which was > created with -f 5. So what is the difference between -f 5 and -f 8? > > Are there parameters which can be set with -f 5 manually and are > created with -f 8 by default? > > Which GOP is used with -f 8? Is -s a default value for -f 8? I read, > that authoring programs (Win) need -s to accept the file. Take a look at the startup information of mpeg2enc. There you see the values mpeg2enc uses. The -s option is a default for VCD/SVCD presets. I'm not soure if it is for DVD, but mayby because else you will not be able to seek forward/backward. If you use -f 5 you are allowed to set most of the parameters on your own. The -f 8 sets a other sequence length by default and a maximal video bitrate of 8500, other gope Size. auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard --- This SF.net email is sponsored by: Tablet PC. Does your code think in ink? You could win a Tablet PC. Get a free Tablet PC hat just for playing. What are you waiting for? http://ads.sourceforge.net/cgi-bin/redirect.pl?micr5043en ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
