February 2006 - MEncoder-users - lists.mplayerhq.hu

set duration when converting jpeg to video
by Peter Falk 15 May '06

15 May '06

Hello, I try to convert a single JPEG file to a video with the following command: mencoder mf://xy.jpg -mf w=800:h=600:fps=25:type=jpg -ovc lavc -lavcopts vcodec=mpeg4 -oac copy -o output.avi/ /But the duration ist only 0,040 sec. How can I set a duration of e.g. 15 sec.?/ /Thanks for your help Peter

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adding black bars to maintain aspect ratio
by Jon Drukman 03 Mar '06

03 Mar '06

i am trying to figure out how to get mencoder to always output a 4:3 image, but with black bars added to preserve the original aspect ratio of the input video file. is it possible? i've played around with dsize and dscale using the negative value options but i always get a stretched 4:3 image. i could be putting in any aspect ratio video but i always want a 4:3 result with added black bars (if necessary). -jsd-

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sync problem with -oac faac
by Victor Condino 01 Mar '06

01 Mar '06

okay, sorry if this is a repost, but i accidentally posted this previously from my girlfriend's gmail (damn browser cookies :) i've recently decided to switch from xvid/lame to x264/faac for higher quality, now that i can get mplayer to build (from cvs) with x264 (from svn) support. x264 encodes AVC *beautifully*... and at bitrates where xvid/divx would be artifacting much worse... my main issue after doing a few test encodes is with faac... it seems that when using -oac faac the audio leads by several seconds (!)... not sure if sync drifts yet, so a possible workaround might be manually determining an offset and encoding with it, but still... i tried reencoding using x264 and -oac mp3lame and sync was fine. anyone else experienced this sync problem with faac? anone know of a solution?

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Converting WMV to MOV
by Trevor Nightingale 01 Mar '06

01 Mar '06

I am trying to convert a wmv file to a quicktime format (mov). I have tried : mencoder p.wmv -o p.mov -ovc lavc -oac pcm -ffourcc DX50 It generates the p.mov but when played using mplayer is states it is an avi and will not play in the Quicktime player on Windows. Any suggestions would be appreciated. Trevor

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DVD Rip problems
by Nitin Jain 28 Feb '06

28 Feb '06

>mencoder.exe dvd://3 -o test.avi -ofps 25 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 While trying to rip a DVD using the above command, I got the following message [unfortunately, constrained to do this work on a win32 platform :-( ] : Writing AVI header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp h eader. VDec: vo config request - 720 x 480 (preferred csp: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. videocodec: libavcodec (720x480 fourcc=34504d46 [FMP4]) New_Face failed. Maybe the font path is wrong. Please supply the text font file (~/.mplayer/subfont.ttf). subtitle font: load_sub_face failed. Pos: 0.0s 1f ( 0%) 0fps Trem: 0min 0mb A-V:0.000 [0:0] Flushing video frames Writing AVI index... Fixing AVI header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp h eader. Video stream: -1.#IO kbit/s (-2147483648 bps) size: 0 bytes 0.000 secs 1 f rames Audio stream: 124.952 kbit/s (15619 bps) size: 7872 bytes 0.504 secs So, after dumping just a few dozen of KBs, the thing stops! Could someone tell me what would've gone wrong? Thanks aprior, Nitin -- "I'm significant!!".... screamed the dust speck. -- Calvin & Hobbes

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What is the propper name for the ALSA devices now?
by matija＠serverflow.com 27 Feb '06

27 Feb '06

I used to be able to record movies with sound without problems on my machine, but now I upgraded the kernel (and other stuff), and the emu10k that I was recording sound from is no longer the default alsa device. So in order to record sound again, I had to add an adevice parameter to my recording call. However, the method listed in "man mencoder" (adevice=hw=1.0) doesn't seem to work. I also tried =hw=1,0 and adevice=1,0 and adevice=1.0 and none of them seem to work. (I get a "no such file or directory error). What is the current correct method of referring to Alsa devices in my tv:// options? My mencoder version is: MEncoder 1.0pre7-3.3.5 (C) 2000-2005 MPlayer Team and I'm using Debian unstable... Thanks for any help! Matija

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Change framerates with mencoder
by Sergio 26 Feb '06

26 Feb '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all: I'm working in creating video DVDs with Mencoder, and have a problem: how to change the framerate of a video file when it's different to the desired (example: I have a 25fps video and want to burn a NTSC disc). The most common values for files are 24, 25 and 30 fps, and I need to convert all of them to 25 or 30. Currently I have the recipe for: 24 to 30: mencoder -fps 30000/1001 -ofps 30000/1001 -vf telecine,harddup 30 to 25: mencoder -fps 30 -ofps 25 -vf filmdint=io=6:5,harddup But I need a way to convert from 24 to 25, and from 25 to 30. Is there a filter that allows to repeat one frame after X? The idea is to repeat one frame each 24, converting 24 to 25 fps, or repeat one each 5, converting from 25 to 30. I've read all the mencoder documentation but hadn't find something that could be used. Can somebody help me? Thanks. - -- Nos leemos RASTER (Linux user #228804) raster(a)rastersoft.com http://www.rastersoft.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFD/HiaXEZvyfy1ha8RAp33AJ9l91UPoeFcfRfr+DivJFncWHO/cwCgsxkL eLcwKEZAr0//KDf+iYi5dTY= =V8B2 -----END PGP SIGNATURE-----

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Proposed patch for allowing some jitter in mencoder (improved sync handling)
by Matthias Hopf 24 Feb '06

24 Feb '06

Hi all, sorry for crossposting, but this patch needs testing badly. I would suggest to post test results on mencoder-users, and only discussion about the code on mplayer-dev-eng. This is an experimental patch I've been using for the last couple of weeks. It certainly helps me getting rid of duplicated and skipped frames in weired streams (especially MPEG transport streams), as long as their number is leveling out, and in the end it should get perfectly (i.e. within 1 frame) synchronized audio even for really broken streams. As it is experimental it is *not* in a state that can be considered for inclusion. But I'd like to see your comments. Issues with the current patch: 1) I'd like to change the involved synchronization algorithm once more. Expect the user controllable parameters to change once more as well, and that would need re-testing as well. 2) Right now streams with jitter always smaller than <min> will not be changed, e.g. if <min> is larger than 1 and the stream has a constant offset of 1 frame. Relates to 1). 3) A-V output figures will be more or less meaningless and close to 0, as I combined v_timer_corr and v_pts_corr. I added two interesting jitter values (current and accumulated squared) which are actually closer to being really informative. Now what to do with A-V output, nuke it? Change it? Keep it for compatibility's sake? Print out current jitter there? 4) Combining of v_timer_corr and v_pts_corr has been done in the least intrusive way. In the very end I hope to nuke one of them. However, if someone can tell me why and how these should be handled differently, I'd be glad to update my patch. 5) The behavior of the old algorithm can *somehow* be emulated with -allowjitter=min=2,max=2,delay=0 (except for not having the quantization issue any more, so it should be better even in this case), however the default values (min=1.5,max=2.5,delay=40) try to get even better synchronization at hopefully lower jitter generation at the same time. I somehow explained how the jitter correction works in the manual page (-allowjitter), tell me if this is not sufficient or misunderstanding. I can only update German and English. I would especially be interested whether this patch helps with previously problematic streams (and if it does with which parameter set), and whether it breaks any streams that had been encoded fine before. Thanks Matthias -- Matthias Hopf <mhopf(a)suse.de> __ __ __ Maxfeldstr. 5 / 90409 Nuernberg (_ | | (_ |__ mat(a)mshopf.de Phone +49-911-74053-715 __) |_| __) |__ labs www.mshopf.de

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problem re-encoding 5.1 audio ... channels get mixed up
by Phil P 24 Feb '06

24 Feb '06

Hi, I have a file with 5.1 audio that I want to re-encode as 5.1, basically so I can apply the "volnorm" filter and raise the sound level. I use the following command: mencoder <input-file> -ovc lavc -oac lavc -lavcopts acodec=ac3:abitrate=448:vbitrate=1350:vpass=1 -ffourcc DIVX -channels 6 -af volnorm -o <output-file> The command completes correctly but when I play the file on my 5.1 speakers I find the channel outputs have been transposed ie. the original file plays fine but when playing my re-encoded file the centre channel appears to be front-right, front-right is now rear-right... etc... As I'm not applying any channel filters I wouldn't have expected this to happen. Does anyone know why this occurs? Is it a common problem? Is there any workaround? Is there an alternative method to normalize the volume on the original stream? I've searched the archive and couldn't locate a similar question. Much thanks, Phil.

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Converting 1080i to 720p [new to list]
by Wayne Arant 24 Feb '06

24 Feb '06

Hello all. I'm new to the list and mencoder. I have an HDTV capture that I have been having a lot of trouble with, and from my research It looks like it either changes framerate or (the more likely case) it is flipping back and forth between hard and soft telecined. I've tried several things just poking around, and I've been reading as much of the manual as I can follow, but I'm new to the whole idea (I previously only used GUI type programs to re-encode without much concern for the settings) I used this as my command line: mencoder -ovc lavc -oac copy -vf pullup,softskip -ofps 24000/1001 -laccopts vcodec=mpeg2video:trell:mbd=2 -o output.mpg input.ts What I end up with is a strange slow really choppy video with terrible green blocks all over the place. I tried to make sure I understood the options and that I did the right thing, but clearly this is wrong. Can someone shed some light on my problem for me? Thanks, Wayne p.s. I had previously been using FFMPEG, with better success, but can't seem to fix the choppiness.

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