Re:[Mjpeg-users] Saving Recording Audio Levels ALSA vs OSS
Jean, to set the sound recording level, and to mute line output I use aumix -S -l 0 -i 15 -l R before recording and aumix -L >/dev/null after recording in my tvr script for scheduling lavrec recordings: http://mrj.bpa.nu/tvr Mark --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] VCD 2500vbr better quality than SVCD
On Wed, 8 Oct 2003, Greg Trounson wrote: > SVCD does have advantages over VCD (for a start it's mpeg2-based). True. One of the main advantages that mpeg2 brings is the ability to handle interlaced video. > I would create an SVCD, but at VCD resolution (352x288). That should > give you a better picture at 2500kbps than the VCD. That's not a SVCD. XSVCD or other nonstandard format but not SVCD. At that point one of the big advantages of MPEG2 has been discarded - 352x288 is not interlaced (basically half the information has been discarded). If 352x288 is going to be used then variable bitrate MPEG-1 with the VCD format would work just as well. It would take several extra parameters to mpeg2enc and mplex but VBR MPEG1 (nonstandard for VCD format) would probably work in most players. I think for SVCD if the -K kvcd option and -q 8 (or 9) were used the results would make a good SVCD video. If the source has noise then adding yuvdenoise with moderate settings (-l 1 or -l 2) will work wonders. If the current CVS version is being used and the source material is moderate to good quality then the new "-E" option can be used (-E -10 is a moderate setting) to lower the bitrate. Cheers, Steven Schultz --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] VCD 2500vbr better quality than SVCD
Maarten de Boer wrote: Hello, Thanks, Steffen, Bernhard and Steven, for your replies. I will try your suggestions to improve my SVCD recording. I am wondering though, whether it would be better to stick with (non-standard bitrate) VCD, because with the same amount of data the quality is better (since a normal television want show you the higher resolution anyway). Or do you think that with the proper settings, my SVCD should look at least as good as VCD, with the additional advantage of following the standard? SVCD does have advantages over VCD (for a start it's mpeg2-based). I would create an SVCD, but at VCD resolution (352x288). That should give you a better picture at 2500kbps than the VCD. hth, Greg --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] SVCD subtitles
Hi, 0n 03/10/[EMAIL PROTECTED]:51 Steffen Barszus told me: > Am Dienstag, 7. Oktober 2003 01:24 schrieb Andrew Stevens: > > c) Find some way of generating subtitles and/or translating them from > > DVD to SVCD. > > AFAIK CC subtitles are common on DVDs ? I don't think so. AFAIK these CC stuff is common in ntsc land only and not in common use on DVD. Refer to 1.45 of dvd-faq (http://www.dvddemystified.com): ---cut--- Closed Captions on DVDs are carried in a special data channel of the MPEG-2 video stream and are automatically sent to the TV. You can't turn them on or off from the DVD player. ---cut--- You I could switch of all subs I saw on DVD up to now. You can use the vobsub tools to get the subtitles from the dvd. There is: http://thegoods.ath.cx/~hmason/vobtosub-0.2.2.tar.bz2 I am not familiar with :( The option I used are the sutitle2... programs from the transcodeSource/contrib/subrip dir. These are based on mplayer code (mencoder can rip subs, too) but I had problems to get it work with forced subtitles (IMHO the part you are basicly interessted in when making dvd backups), see: http://www.doom9.org/forcedsubs.htm When youn are lucky these forced subs are in a separate stream on the disc or sometimes (intro of StarWars) different angles are used to localize. However, some DVDs just flag some subtitles as shown on the domm9 page. Mplayer and subtile2... were lacking in recognising such flags. Therefore I contacted the author Arne Driescher and he send a patch to the mplayer team, so it is at least in mplayers current cvs (use F to tongle). At my end it works. At the moment AFAIK tools are missing in linux that can rip only the forced subs. However, as Arne promised to enclose the code within one of the next release of his tools it will probably available, soon. There were some discussions on dvdauthor ML concerning subs, too. As I understood them subs will be used for more issues in future e.g. for menu creation. In spite this will not change the problem with svcd subs, I just think it may be an task of the authoring program to insert subs, isn't it? Anyhow, the .idx files you receive when riping subs with the subtitle2... tools for e.g. vobsub is: header specifying size and colors [1] ... timestamp: 00:00:33:133, filepos: 0 so at least the timestamp is there. Just my 0.02. [1] In addition to your, Andrew, points a,b,c I am afraid that more topics have to be solved arising from color, size and where to place the subs. -- bye maik pgp0.pgp Description: PGP signature
Re: [Mjpeg-users] Saving Recording Audio Levels ALSA vs OSS
use alsactl store and alsactl restore. --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
[Mjpeg-users] Saving Recording Audio Levels ALSA vs OSS
Hi, This is a bit off topic, but I figure somebody here is probably doing it and might have some advice for me. I've got a Creative SBLive soundcard. I've got the newest ALSA stuff set up for it. I've got the OSS emulation stuff set up. I'm running Redhat 9 and I sometimes use Gnome when I bother to get into X. I run amixer to load the sound modules when I start up. To record audio successfully, I then seem to have to get into X and run the gnome-volume-control to adjust some stuff like "igain" before I can get lavrec to record anything. The lavrec -l flag seems to just work on the Line gain and not this 'igain'. Problem is, I can't figure out how to do this automatically on boot, so I have no recovery in case of power failure. Any recommendations? Should I disable the OSS emulation to handle everything from alsamixer? Should I do something creative with asound? Thanks for the read, Jean --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] SVCD subtitles
Am Dienstag, 7. Oktober 2003 01:24 schrieb Andrew Stevens: > > I didn't find any reference to this topic in the mjpegtools > > manpages, so I ask the question here. Do the mjpegtools support > > multiplexing mpeg-2 streams with subtitles to create SVCDs ? The > > SVCD standard support up to 4 (if I'm not mistaken) subtitle > > streams. It would be nice to use them, as moving the subtitles off > > the picture will improve compression, and will allow the user (me > > :-) to switch them off. > > Its a multiplexer / authoring issue. > > You need to: > a) Extend the multiplexer so it can correctly chunk the SVCD subtitle > streams (not hard actually) for muxing. This might help: http://www.vcdimager.org/pub/vcdimager/manuals/0.7/vcdimager.html#SEC27 Haven't found information about CC subtitles (CVD compliant, not SVCD) > b) Find some way of telling the multiplexer *when* each subtitle > image should be muxed. parsing existing formats. > c) Find some way of generating subtitles and/or translating them from > DVD to SVCD. AFAIK CC subtitles are common on DVDs ? So it may easier to create CVD compliant subtitles than SVCD ones. HTH Steffen --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] cut AC3 file
On Sun, 2003-10-05 at 11:34, Florin Andrei wrote: > Any idea how to cut the first 10 frames of an AC3 file and save them > into another file, without modifying any of the audio stream parameters? > (bitrate, # of channels...) Nevermind, i found two solutions: http://sourceforge.net/mailarchive/forum.php?thread_id=3240861&forum_id=727 One of them involves a clever usage of the standard "head" utility, the other is based on a recent CVS version of transcode. -- Florin Andrei http://florin.myip.org/ --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
Re: [Mjpeg-users] Sourceforge CVS caught up with mjpegtools today
On Mon, 2003-10-06 at 19:54, Steven M. Schultz wrote: > On 6 Oct 2003, Florin Andrei wrote: > > > "this procedure forces blocks of a type that don't carry much > > information but are expensive to encode to be simply skipped" > > > > If they are skipped at encoding, with what do they get replaced when > > viewing? > > Oops - misunderstanding alert ;) It probably wasn't worded > exactly right. Yeah :-) a rephrasing might help. > -E -10 is a conservative (middle range) setting. Values of 20 > or more _may_ artifact - your mileage will vary of course ;) Ok, so how will those artifacts look like? Essentially, when you replace that row of "almost zeros" with a row of zeroes only, the offending block becomes replaced with... uniform color/luma? Something close to its neighbours? Or is it more complicated than that? (i learned my lesson, i hope, and i don't expect the MPEG compression algo's to behave in an intuitive fashion) -- Florin Andrei http://florin.myip.org/ --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf ___ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
