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

[ANNOUNCE] new MPEG muxer in cvs
by Nico Sabbi 18 Jun '06

18 Jun '06

Hi, I have just finishing committing the new code of the MPEG muxer. It's almost completely different from the old one, hopefully much better :) What has changed: - variable muxrate (made badly) has gone - the dreaded APTS < SCR is fixed - images don't freeze anymore nor play at seemingly lower framerate - seeking has largely improved (no more need to wait for audio and video to sync) - the code has been largely generalized, so extending it and adding suport for subs/ multiple audio streams is much easier - all constraints on timings and buffering sizes will be respected, provided that the muxrate is big enough What's still to fix: - it's still possible to have some occasional buffer under and/or ADTS < SCR (strictly related to each other), especially when muxing to xvcd and/or with a large number of b-frames. If this happens the muxer will raise the muxrate and report it, so if you remux using :muxrate=N the problem should vanish; - occasional buffer overflow an/or pts >> scr will be fixed in the next few days Strongly advised: - when encoding video (e.g. without -ovc copy) _always_ use -vf softskip (btw, I have and had a lot of problems with harddup, so I don't use it); - using -ofps is generally quite bad (with the old muxer, too), better use -speed newfr/oldfr (eventually resampling audio) Please, report eventual problems. Nico

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.Mov in Flash -> FLV woes
by Robert Sandie 02 Jun '06

02 Jun '06

Did you know you can output to .MOV from Flash Authoring? Well a client wants to convert that into FLV's with Mencoder. Am getting a Demux problem and it cannot find headers. Anyone had this problem and know if mencoder could this in anyway handle this? - Rob

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trimming video
by Sean Brady 31 May '06

31 May '06

Hello everyone. I'm trying to trim both the beginning and end of a video. I've found this option for trimming off the end: -endpos But I can't find any option for trimming the beginning, like a - startpos, or something like that. Any ideas? Thanks for the help! - Sean

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Mencoder support for multiple audio tracks and subtitle tracks
by Oded Arbel 30 May '06

30 May '06

Hi. I'm trying to use mencoder to convert a Matroska file to AVI (and possibly convert the audio/video format, but that isn't important). The problem is that the mkv file contains two audio tracks (different languages) and two subtitles tracks (same). I would like to generate an AVI file which contains all the tracks from the mkv file. I tried to run mencoder orig.mkv -o out.avi -oac copy -ovc copy -aid 0 -aid 1 -sid 0 -sid 1 but that only got me an avi file with the second audio track and no subtitles (at least when played back with mencoder) is there a way to get mencoder to handle more then one audio track ? TIA -- Oded ::.. "Waiter, there's no fly in my soup!" -- Kermit the frog

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Encoding .ogm files to .avi files with multiple tracks and subtitles
by Joseph Goh 30 May '06

30 May '06

Hi guys, I just got to know about the wonders of mencoder recently. I've tried to copy an .ogm file to .avi and the quality is really great! However, there are things that I could not figure out even after reading the documentation. How do I encode the .ogm file which has 2 tracks inside and 1 subtitle? Can I give a command to output the .avi file to have my desired track and the subtitle? If there's a way, please help me. I really wish to do that. Thanks alot. Joseph

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Problem with hardcoding subtitles into a movie
by Виктор Кожухаров 29 May '06

29 May '06

Hello, I'm trying to hardcode subtitles into an avi, where the source is a mkv movie with embeded subtitles. I'm using this command to do it: mencoder $movie -alang jpn -sid 1 -subpos 100 -subfont-text-scale 6 -subwidth 100 -subalign 2 -subfont-osd-scale 8 -subfont-autoscale 3 -spuaa 20 -spualign 2 -fontconfig -font 'DejaVu Sans' -ovc lavc -lavcopts vcodec=mpeg4 -oac pcm -o $temp with the last mplayer snapshot. The problem is, that I can't change the subtitle font size. Whatever I put into the -subfont-text-scale and -subfont-osd-scale options seems to be ignored. -font also seems to be ignored. And the resulting hardcoded font size is too small to be read on the intended screen. Is there something I'm missing here? Mencoder doesn't say that there are any errors at all. -- Виктор Кожухаров /Viktor Kojouharov/ <vkojouharov(a)gmail.org>

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New Mencoder user: questions about some details
by Niki Kovacs 29 May '06

29 May '06

Hi, I'm an Austrian writer living in Montpezat (South France), and a 100% GNU/Linux user since 2001. My actual system is CentOS 4.3. I gave DVD::RIP and Acidrip a shot, but quickly sensed that I had to get my hands dirty in order to achieve more than partial successes. DVD::RIP worked OK on half of my CDs, but refused to read the other half. I took a few days to read the excellent doc on the MPlayer site, fiddled around, tried many things, and I'm starting to have my first positive results... as well as a few questions that emerge. I tried encoding with libavcodec. Since time doesn't matter and I have a rather fast PC, I chose the "best quality" option. I encoded similar to this option found in the book: mencoder dvd://1 -ofps 24000/1001 -oac copy -vf pullup,softskip,crop=720:352:0:62,hqdn3d=2:1:2 -ovc lavc \ -lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=1 \ -o Harry_Potter_2.avi ... and then another pass with the same options and vpass=2. Of course I tuned it to my needs (language, subtitles, ...) I admit I used most of the options without knowing too much what they do, telling myself that once I liked the result, I could always go back and understand the details later. Q1: given a certain DVD title, how do I calculate the bitrate for a certain given file size? Say I encode my DVD with the options above (except bitrate of course), how can I calculate the bitrate for, say, 250 MB, 400 MB, 650 MB, 700 MB, 800 MB, 1400 MB and so on? Q2: as far as I understand, the example above only *copies* the sound files without actually *compressing* them? So am I right in thinking that I can compress the sound simply by using -oac mp3lame -lameopts [...]? Is there any special reason the example does not compress the sound? Q3: Let's say I end up with a 1.400 MB .avi file. How do I manage to split that, so it fits on two CD's? Seems obvious information, only I couldn't manage to find this one. (google only knew about transcode) Cheers, Niki Kovacs

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Sizing JPEGs Correctly For Any Dimension
by Robert Sandie 28 May '06

28 May '06

This may be a beginner question but I am having a problem with our current image generation solution. We are trying to make the images scale after encoding. Right now we our current commands don't scale or put in "black area's in the top of the video". There has to be a technical term for what youtube does very well: http://static15.youtube.com/vi/OspppTi11ak/2.jpg Does anyone know the appropriate command to generate this with mencoder from any source (AVI,MOV, etc)? Is ImageMagick required here if we only need one image output? - rob

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re: x264 encoding into mkv. (oops)
by Everett 28 May '06

28 May '06

sorry, my last post was in regard to the following message, which I sent yesterday. Most of this video was great but I discovered it was messed up at the end!! so I'm trying to re-encode tonight, adding the "harddup" filter at the end of the -vf chain, after reading in the documentation about a/v muxing sync issues. I think this might solve the problem, the audio was still going, but the video was garbage. Date: Fri, 26 May 20 06 19:40:28 -0700 From: Everett <everettraygun(a)gmail.com> Subject: [MEncoder-users] dvd rip -> x264 + ogg -> mkv or mp4 containers, using mencoder To: mencoder-users(a)mplayerhq.hu Message-ID: <200605261940.28963.everettraygun(a)gmail.com> Content-Type: text/plain; charset="us-ascii" this is my first post. forgive me if it's not helpful or if it's been gone over already. I have found a solution/workaround for a problem that I had trouble finding an answer for. I see that someone recently posted this problem in another form, i.e. how to get mencoder to encode for ipod. this is the series of commands that I use to get an excellent rip of a dvd. I do a streamdump of the dvd using $mplayer dvd://1 -dvd-device /mnt/<mydvdmount> -dumpstream -dumpfile rip.vob here are the commands I used for disc one of the extended "lord of the rings, fellowship of the rings" : <pass1> $mencoder rip.vob -vf pullup,softskip,crop=720:352:0:62 -nosound -ovc x264 -x264encopts bitrate=1000:subq=4:bframes=3:b_pyramid:weight_b:turbo=1:pass=1 -ofps 24000/1001 -of rawvideo -o video.264 <pass2> $mencoder rip.vob -vf pullup,softskip,crop=720:352:0:62 -nosound -ovc x264 -x264encopts bitrate=1000:subq=6:frameref=6:4x4mv:8x8dct:me=3:bframes=3:b_pyramid:weight_b:pass=2 -ofps 24000/1001 -of rawvideo -o video.264 <put video in mp4 format, mkvmerge doesn't accept raw x264 nor x264 in an avi file (properly)> $MP4Box -fps 23.976025 -add video.264 video.mp4 <dump audio to wav> $mplayer rip.vob -vo null -ao pcm:file="audio.wav" <encode wav to ogg> $oggenc -q8 audio.wav <stick together in matroska file> $mkvmerge -o rip.mkv audio.ogg video.mp4 <watch with mplayer> $mplayer -fs rip.mkv this makes a sweet rip with hiq ogg and x264 video. the output format rawvideo encodes only the video, you can't encode audio at the same time. I didn't want to anyway, since I wanted to use ogg. You have to use .264 as the file extension for MP4Box (which I renamed as root to mp4box hahahahaha wtf?). (#mv /usr/local/bin/MP4Box /usr/local/bin/mp4box) mp4box is part of mpeg4ip. mkvmerge is part of mkvtoolnix. for ipod, you would have to use faac or something for the audio, and of course you'd have to scale it or whatever down to the right size. I don't have an ipod video (yet!!). (also, you'd have to change the commands for mp4box to include the audio, and of course skip the mkvmerge step.) I hope this helps someone. I wanted to do it because I'm going to stick both the discs together into one file using mkvmerge. -- http://www.shadowrise.com

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(no subject)
by Everett 28 May '06

28 May '06

I thought that this worked great, but the end of the video was totally munched. I'm trying again tonight, adding "harddup" at the end of the filter chain, after reading something in the documentation about a/v muxing sync issues. (it seemed like the audio was still going-- the video was garbage.) we'll see if it works this time. -- http://www.shadowrise.com

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