June 2005 - MEncoder-users - lists.mplayerhq.hu

Best possible quality from a DVD
by Federico 'Pain' Pistono 18 Jun '05

18 Jun '05

Is it possible to copy raw the dvd into an uncompressed mpeg2 using mencoder? I tried mencoder dvd://1 -chapter 3-3 -of mpeg -oac copy -ovc copy -o tvout.mpg That i get a lot of seeking errors, a good video quality but the audio disappears after a few minutes. With the "raw" it encodes but the file size is 2Kbytes.... Then I tried this: mencoder dvd://1 -chapter 3-3 -of mpeg -oac copy -ovc lavc -lavcopts vcodec=huffyuv:vbitrate=8000:keyint=25 -vf hqdn3d,pullup,pp=md,scale=720:480 -noskip -o tvout.mpg but my mplayer cannot open the video codec. I use this version: € mplayer -v MPlayer 1.0pre7-3.3.5 (C) 2000-2005 MPlayer Team CPU: PowerPC the cvs gives me compiling problems. If try to do this crazy thing: mencoder dvd://1 -chapter 3-3 -of mpeg -oac copy -ovc copy -o out.mpeg does work perfectly, but i guess it's encrypted, so useless at the end. Mplayer opens the file, but it doesn't seek it. So, what can I do? I need to do video editing with final cut, do you suggest me to use something like this: mencoder dvd://1 -chapter 3-3 -ovc lavc -oac copy -lavcopts vcodec=mpeg4:vbitrate=7500:vqmin=1:lmin=1:v4mv:mbd=2:trell:subcmp=2:cmp=2:precmp=2:mv0:autoaspect:vpass=1:mpeg_quant:psnr:vqcomp= 0.7:vqblur=0.3 -o out.avi in a two pass encoding, and use a high quality mpeg4, or find a way to use an uncompressed mpeg2? -- Federico 'Pain' Pistono - Scream for me.... Department of Computer Science - Verona, Italy My website :::::::::::::::: http://www.federicopistono.org My personal website ::: http://pain.altervista.org Ex-College Website :::: http://pain.altervista.org/flatnukeuwcad Linux Registered User #340392

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Going slowly but most assuredly insane with my sync problems...
by Brian Keener 18 Jun '05

18 Jun '05

I know we've been over this like a dozen times, but what on earth is wrong with this command line: mencoder -fps 30000/1001 -ofps 30000/1001 -endpos 01:00:00 -oac pcm -ovc lavc -lavcopts vcodec=huffyuv:keyint=25:format=422p -tv driver=v4l2:norm=ntsc:input=2:adevice=/dev/dsp1:width=352:height=480 -vf harddup -af volume=-10 -o tv.avi tv:// Audio sync is hideous, and I'm POSITIVE this exact command worked perfectly earlier. I only dropped 4 frames total during the entire capture. Brian K

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Converting an avi file to mpeg2 for legacy players (losing sound and lots of error messages).
by John Dickinson 17 Jun '05

17 Jun '05

I recently bought a digital camera and took some movies of my kids which I wish to share with my family who have older computers or in some cases just older dvd players mpeg compliant. So I want to convert a 30fps 640x480 24bpp motion jpeg video with uncompressed PCM sound into 1) a high quality mpeg2 (the basic dvd movie format right?) for playing on an older dvd player 2) a couple of them need rotating 90 degrees before distributing to other family with older pcs and stock movie players like Windows media player v7 or 8. (mostly solved) I am only converting about 50MB of files and putting them on a cd so compressing the files is not as relevant as making them portable without loosing quality. I have tried (to make good mpeg2): ========================= D:\mplayer>mencoder -of mpeg -ovc lavc -lavcopts vcodec=mpeg2video -oac copy -vop rotate=1 in.avi -o test.mpg but get errors like: WARNING: SCR: 170842242, APTS: 0, DELTA=0.000 secs, BYTES=1853135223 ERROR: SCR: 1.872, VPTS: 1.000, DELTA=-0.872 secs D:\mplayer>mencoder -of mpeg -ovc lavc -lavcopts vcodec=mpeg1video -oac copy -vop rotate=1 in.avi -o test.mpg more errors, loss of sound and poor quality video D:\mplayer>mencoder -of mpeg -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=3200 -oac pcm -vop rotate=1 in.avi -o test.mpg Gives good video but no sound. More error messages. D:\mplayer>mencoder -of mpeg -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=3200 -oac mp3lame -vop rotate=1 in.avi -o test.mpg Error messages and crashes the media player. For problem 2: I do this: ================= D:\mplayer>mencoder -ovc lavc -lavcopts vcodec=wmv2:vbitrate=6000 -oac copy -vop rotate=1 in.avi works well on my pc and seems portable but asking for vbitrate=7000 (almost the same as the original file as reported by mplayer causes the video to freeze on playback using the media player) Thanks for any help! John

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Re: [MPlayer-users] Looking for a FAQ on using mencoder to create high quality mpeg files
by Guillaume POIRIER 17 Jun '05

17 Jun '05

Hi, On 6/17/05, John Dickinson <john.k.dickinson(a)gmail.com> wrote: > Thanks for the link to the docs but I am still struggling to get a > high-quality mpeg and rotated avi that works in older windows media > players (v7-8). > > I have two principal concerns: > 1) can it play on older dvdplayers (default standard was mpeg2 wasn't it?) > 2) Quality of result. > > Currently I want to convert about ~50MB of what looks like good > quality 30fps 640x480 motion jpeg avi movies to mpeg for the > grandparents (no computer but they have an older dvd player). Size is > obviously not the issue here. It could double and not matter. > > For the other relatives with the computers (mostly older - not XP) > I'll give them the avi files direct but I do need to rotate a couple > 90 degrees and would like to do it without much loss of quality. > > If I can't play the converted file on my machine using windows media > player 8 then they are unlikely to be able to either. > > I have found the place for the mencoder mailing list so I will join it > and move this question there. I have never tried to do such a thing, but I guess you want to play with MEncoder's MPEG muxer (-mpegopts), lavc (-lavcopts) with vcodec=mpeg2video. You should be able to adapt the existing examples, given for MPEG4 so that they can be used with MPEG2. Here are some more pointer that might be usefull (I did not read them, but they look usefull): http://dvdauthor.sourceforge.net/ http://forums.gentoo.org/viewtopic.php?t=117709 http://qdvdauthor.sourceforge.net/guide/index.html I hope I'm not gonna lead you to a wrong track, but I belive that other people will correct me if I'm wrong. Anyway, I wish that you'll, in the end, manage to do what want. Could you please then document what you did to generate your MPEG2 files so that they can be played. -- I should have invented the tape recorder, that way people would have more quotes of me to put at the bottom of their e-mails -- Benjamin Franklin

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MP4 file format output with MEncoder ?
by Olivier Amato 17 Jun '05

17 Jun '05

I would like to know if it is possible to output MP4 files with MEncoder, like ffmpeg does it ? Actually, my goal is to transcode an MPEG-2 file to an MPEG-4 ISMA compliant one for streaming purpose ( XviD video codec, AAC-LC audio codec and MP4 file format ). Olivier

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Compiling mplayer/ffmpeg from cvs
by Meino Christian Cramer 16 Jun '05

16 Jun '05

Hi, are there any known problems concerning libpostproc when compiling and installing ffmpeg and mplayer from CVS ? Where can I find up-to-date compiling/installing instructions for mplayer/ffmpeg from cvs ? Kind regards, Meino

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RE Duplicate frames when encoding from TV?
by Carl Beech 16 Jun '05

16 Jun '05

>> As for the motherboard, its >> an abit, however, my last board didn't have a nforce chipset either. >I didn't say NForce chipsets were the only ones that do DMA properly, >they just seem to be the only one that do it consistently. With a VIA/ >SIS chipset, it's a crapshoot to see if you get a good one or a >terribly buggy one. Even with the major brands like Asus/MSI/ >Gigabyte/etc. >> Thanks for the info about DMA - I'll look into it - perhaps moving >> the tv board (PCTV Rave) to another slot may make the difference.... >Good luck, but I don't expect it will change anything. You didn't mention anything about xawtv - as mentioned, I can get full screen with no glitches? As a matter of interest, here's the command line I use (in a batch file) to perform the record - can you see any areas / parameters that might improve the situation? (When I'm recording, I get a) jerky frames, but also b) occasional frames that appear 'moved' - e.g. a person will be standing on the left hand side of the screen, and for a split second they appear in the middle - it's like the synchronisation of the screen was off? Anyway, here's the command line: nice -5 mencoder -tv driver=v4l:width=720:height=576:input=1:amode=1:adevice=/dev/dsp:forcechan=2:volume=50 -endpos $2:$3:00 -oac mp3lame -ovc lavc -lavcopts vcodec=mpeg4:vqmin=2:vqscale=2 -o $1.avi tv:// - the programs run under root, so I can 'nice' the task to have a higher priority Param 1 ($1) = name of output file Param 2 = hours to record Param 3 = minutes to record. My old command line is: nice -5 mencoder -tv driver=v4l:width=640:height=480:input=1:amode=1:adevice=/dev/dsp:forcechan=2:volume=50 -endpos $2:$3:00 -oac copy-ovc lavc -lavcopts vbitrate=1800 -o $1.lavc tv:// Which gives a larger file - also recording at 640 x 480, but still exhibits the same problems.... Thanks Carl.

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Video bitrate 104857 kbps, video GOP is too long.
by Brian Keener 15 Jun '05

15 Jun '05

That's what TMPGenc DVD Author reports when I try to add the file to a new project. mencoder tv.avi -fps 30000/1001 -ofps 30000/1001 -of mpeg -oac lavc -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=7000:keyint=15 -vf harddup,hqdn3d,pp=md,scale=720:480 -mc 0 -o tvout.mpg It's a 512x384 source file (odd size, I know), encoded with the above command line. I can link to a short (1 second) encoded clip using those same parameters, if that would help. Didn't seem to affect the operation of the disc at all, I just found it odd, and confusing. Brian K

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A/V sync issues encoding from huffyuv avi to mpeg2
by Brian Keener 14 Jun '05

14 Jun '05

OK, I've gotten through all my other problems, but a a/v sync issue remains. My original media, a huffyuv compressed avi with PCM sound data appears to have good a/v sync. When encoding to mpeg2 with: mencoder tv.avi -of mpeg -oac lavc -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=5000:keyint=25:acodec=mp2 -noskip -o tvout.mpg I get a fair amount of audio skew after about an hour; I'd estimate it to be around 1/10th of a second. Any ideas what I can check? Brian K

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RE Duplicate frames when encoding from TV?
by Carl Beech 14 Jun '05

14 Jun '05

>> Theoretically the new board should chew through tv capture using the >> same settings - but it isn't - I get a 'duplicate frame' message >> about every second, and I get approx 24fps. - The disk drive light is >> hardly 'on'. >What is wrong with getting a few "duplicate frame" messages? >As for V4L capture, I'm willing to bet you've got a VIA or SIS chipset >(ie. not Nforce), and have just found out the hard way that a lot of >motherboards just don't do proper DMA on the PCI bus, making them >useless with (uncompressed) TV capture cards. If you can, I suggest >returning the motherboard, and getting a different one. Buying from a >major brand doesn't help. It seems the only sure way to get a proper >motherboard anymore is to get one with an Nvidia Nforce chipset. - What's wrong is that the audio goes out of sync (which I can fix through avidemux2), and I get glitches within the video. As for the motherboard, its an abit, however, my last board didn't have a nforce chipset either. Thanks for the info about DMA - I'll look into it - perhaps moving the tv board (PCTV Rave) to another slot may make the difference.... As a matter of interest, watching TV directly through xawtv, I don't get any glitches.....? Carl.

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