[mythtv-users] Conversion to DVD
James L. Paul
james at mauibay.net
Thu Nov 6 23:35:49 EST 2003
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On Thursday 06 November 2003 16:34, Stuart Hodges wrote:
> Hi,
>
> I compiled avidemux2, all seems to work fine until I try to multiplex.
> Then I get droped frames, thus:
I don't see you using the -V switch with mplex. Try it. :)
> mplex -f 8 audio.try1.mp2 video.try1.m2v -o mpg.try1.mpg
> INFO: [mplex] mplex version 2.2.1 ($Date: 2002/02/04 19:06:14 $)
> INFO: [mplex] File audio.try1.mp2 looks like an MPEG Audio stream.
> INFO: [mplex] File video.try1.m2v looks like an MPEG Video stream.
> INFO: [mplex] Found 1 video streams 1 MPEG audio streams and 0 AC3
> streams INFO: [mplex] Selecting DVD output profile (INCOMEPLETE!!!!)
> INFO: [mplex] Scanning for header info: Video stream e0 (video.try1.m2v)
> INFO: [mplex] VIDEO STREAM: e0
> INFO: [mplex] Frame width : 720
> INFO: [mplex] Frame height : 480
> INFO: [mplex] Aspect ratio : 4:3 display
> INFO: [mplex] Picture rate : 29.970 frames/sec
> INFO: [mplex] Bit rate : 16000000 bits/sec
> INFO: [mplex] Vbv buffer size : 229376 bytes
> INFO: [mplex] CSPF : 0
> INFO: [mplex] Scanning for header info: Audio stream c0 (audio.try1.mp2)
> INFO: [mplex] AUDIO STREAM:
> INFO: [mplex] Audio version : 1.0
> INFO: [mplex] Layer : 3
> INFO: [mplex] CRC checksums : no
> INFO: [mplex] Bit rate : 49152 bytes/sec (384 kbit/sec)
> INFO: [mplex] Frequency : 48000 Hz
> INFO: [mplex] Mode : 0 stereo
> INFO: [mplex] Mode extension : 0
> INFO: [mplex] Copyright bit : 0 no copyright
> INFO: [mplex] Original/Copy : 0 copy
> INFO: [mplex] Emphasis : 0 none
> INFO: [mplex] SYSTEMS/PROGRAM stream:
> INFO: [mplex] rough-guess multiplexed stream data rate : 16648800
> INFO: [mplex] target data-rate specified : 10080000
> ++ WARN: [mplex] Target data rate lower than computed requirement!
> ++ WARN: [mplex] N.b. a 20% or so discrepancy in variable bit-rate
> ++ WARN: [mplex] streams is common and harmless provided no time-outs will
> occur
> INFO: [mplex] Sectors = 89 Video delay = 13019 Audio delay = 13019
> INFO: [mplex] New sequence commences...
> INFO: [mplex] Video e0: buf= 237568 frame=000000 sector=00000000
> INFO: [mplex] Audio c0: buf= 4096 frame=000000 sector=00000000
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=37156
> required(DTS)=37043
> ++ WARN: [mplex] Video e0: buf= 181219 frame=000008 sector=00000246
> ++ WARN: [mplex] Audio c0: buf= 3783 frame=000012 sector=00000007
>
> etc, until:
>
> **ERROR: [mplex] Too many frame drops -exiting
>
> The few seconds of multiplexed video look fine, I think I have everything
> set fine in mythtv, any ideas what I am doing wrong ?
>
> Thanks,
>
> Stuart
>
> On Tuesday 04 November 2003 04:44, James L. Paul wrote:
> > On Monday 03 November 2003 15:50, matt hatfield wrote:
> > > > Hi,
> > > >
> > > > I am using MYTHTV successfully with a PVR-350. Occasionally I
> > > > want to
> > > > save
> > > > something to DVD.
> > > >
> > > > The posting " Re:Burning DVD's from inside the Myth" says :
> > > > (It's just a matter of demuxing, remuxing with
> > > > NAV markers, then dvdauthor, mkisofs, cdrecord.)
> > > >
> > > > I get the dvdauthor, mkisofs, cdrecord bit, but the best I
> > > > can do is :
> > > >
> > > > 1) Mencoder to convert to mjpeg and WAV.
> > > > mencoder -o OUTPUT_FILE -ofps 30 -ovc lavc -lavcopts
> > > > vcodec=mjpeg:vhq:vqmin=2:vqmax=10 -oac pcm INPUT_FILE
> > > >
> > > > 2) reencode video
> > > > cat OUTPUT_VIDEO | yuvscaler -O SIZE_720x480 | mpeg2enc -F4 -f 8 -q 5
> > > > -4 1 -2
> > > > 1 -P -N -o VIDEO.m2v
> > > >
> > > > 3) reencode audio
> > > > lav2wav OUTPUT_AUDIO | mp2enc -r 48000 -o AUDIO.mp2
> > > >
> > > > 4) Remultiplex
> > > > mplex -f 8 SOUND.mp2 VIDEO.m2v -o CONVERTED.mpg
> > > >
> > > > Then dvddirgen etc.
> > > >
> > > > I also have to cut the input video up on input to stop audio drift.
> > > >
> > > > This takes a long time (14 hours processing time on a AMD 2100+) and
> > > > the output quality is not very good, loads of artifacts that were not
> > > > in the original video.
> > > >
> > > > I tried using ffmpeg to create the mjpeg to get around using
> > > > mencoder, but yuvscalar did not like it.
> > > >
> > > > Any ideas ?
> > > >
> > > > Thanks,
> > > >
> > > > Stuart
> > > > _______________________________________________
> > > > mythtv-users mailing list
> > > > mythtv-users at mythtv.org
> > > > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> > >
> > > Might not be the exact answer you are looking for, but I have done much
> > > experimenting with this myself. I have come to the conclusion that this
> > > is about the only place that windows has linux beat. I beleive that the
> > > files made by the PVR-350 are the same format as PVR-250. If this is
> > > correct you can use TMPGENC DVD Author to drop the file right onto a
> > > DVD no
> > > re-encoding or anything. I couldn't find a linux equivilant no matter
> > > how hard I tried. The total time from start to finish is about 30 - 35
> > > minutes including burn time. I encode my recordings at 4400 with a 8800
> > > peak 384 audio. The DVD's look great just like I was watching the show.
> > > Again I am not sure if this is what you are looking for but it does
> > > work.
> >
> > Windows definitely is in the lead for MPEG editing tools and DVD
> > authoring tools. But I finally found it possible to at least go from
> > MythTV PVR-250 to DVD and edit out commercials, even if not simply or
> > automated.
> >
> > Definitely eliminate re-encoding. First of all, make sure your capture
> > specs match a valid DVD compliant format. I use 352x480 and 48000/224
> > audio, but you can use 720x480 just as well. I don't recommend any
> > others.
> >
> > The only thing that usually outright prevents dvdauthor from accepting
> > the PVR-250 file as-is is the lack of the NAV placeholders. tcmplex and
> > mplex can multiplex these in, I use mplex. Of course, before you can
> > mplex you need to demultiplex the program stream file (.mpg) into
> > elementary streams (.m2v & .mp2).
> >
> > My struggle has been finding tools that can do this properly so that both
> > elementary files are useable to further tools. The mpgtx tool can do it
> > as long as you do the whole file without any cuts. Older versions of
> > avidemux won't recognize the PVR-250's files correctly. Older versions of
> > avidemux2 would almost work, but broke the audio. GOPchop gave useable
> > audio but broke video.
> >
> > Behold, the mid-October latest version of avidemux2 has been updated to
> > properly recognize the PVR-250's audio and is useable. Don't let the name
> > fool you, you won't need to use any of the AVI features of avidemux2. ;)
> > Instead of creating an AVI file, you can instead "save raw video" to get
> > the .m2v file. If you leave audio processing disabled, the "Save Audio"
> > will save the raw audio in .mp2 format. Any cut markers you have selected
> > will be in effect, so you can save m2v/mp2 sets for each segment between
> > commercials.
> >
> > Feed these sets to mplex using "-f 8" to get the NAV placeholders, and
> > the resulting segments will be palatable to dvdauthor.
> >
> > I just finished a DVD today that contains seven episodes of Family Guy
> > that were sitting on my MythTV box, with a main menu to select which
> > episode to watch. I used this method:
> >
> > Use avidemux2 to cut the program into commercial-free segments of m2v/mp2
> > files.
> > mplex each set together using -f 8 to get one mpg file per segment.
> > Create a menu.mpg appropriate for this DVD. (a whole other topic)
> > mkdir mydvd
> > dvdauthor -o mydvd file1.mpg file2.mpg ...
> > dvdauthor -T -o mydvd -m <button defs> <menu.mpg> -P
> > Then it's just the old mkisofs -dvd-video and cdrecord steps.
> >
> > avidemux can be called from command line, so it's pretty easy to automate
> > the creation of an uncut simple single-title menuless DVD. I haven't
> > written any generalize scripts though, just my own shell script for my
> > specific files that I hand-edit each time. I've got a lot of little
> > things I'm still trying to perfect. ;)
> >
> > > Matt
> > > _______________________________________________
> > > mythtv-users mailing list
> > > mythtv-users at mythtv.org
> > > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
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