July 2008 - MEncoder-users - lists.mplayerhq.hu

Help with MPG video encoding
by Walter Belhaven 20 Apr '13

20 Apr '13

Hi, I've got a question on how to get the best possible MPG encoding of a movie source, "at any price" so to speak -- i.e., as many bits as the encoder needs to get the highest possible video quality. It appears to me that the MPG encoding process is introducing artifacts that are present regardless of the amount of "free reign" I give to the encoder with respect to quantization, bitrate, and the like. My bottom line question is thus: "Are these artifacts inherent in MPG encoding, or am I just not twiddling the knobs and dials on the encoder correctly?" Here's all the details ... My source is a mixed hard- and soft-telecined "movie" at 1080/60i that I'm trying to tanscode to 480/24p, soft telecined to 480/60i, for ultimate burning to an NTSC DVD-Video. When I use mencoder to inverse telecine, crop out the crud, expand back to the original letterbox ratio (it's 2.35:1, not 16/9), and 'encode' the video with HUFFYUV (422P), the resulting video looks stunning, with no 'blocking' artifacts to speak of. This, of course, is as expected. But when I encode the video in MPG2 or MPG4, even with vqscale=1 or vqscale=2, I see sometimes severe blocking in the resulting video. Is this because the chroma is being subsampled vertically and horizontally (4:2:0), or is it because 'vqscale' is (perhaps necessary but) not sufficient to get "maximum quality at any price" encoding? Thanks, WB ____________________________________________________________________________________ Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. http://videogames.yahoo.com/platform?platform=120121

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B-frames and GOP with MPEG-2 for DVD
by Nicolas Hesler 16 Apr '11

16 Apr '11

Can anyone offer any input to the following command line? I've been trying to refine for the highest possible quality of MPEG-2 while staying DVD compliant. The source is 24fps. (Note: format=mpeg2, because format=dvd does not work with Adobe Encore 2.0). From what I understand, keeping GOP open, improves quality. Is this true? Is it 100% DVD compliant? Do I want to introduce B frames in my encoding? (The vb_strategy part of my command line is currently useless, right?) If parts of my video are reaching into 9-10 Mbs bitrate, would it beneficial to introduce B-Frames? Will it improve quality? (This is probably a stupid question) Are the sync issues with bframes only relevant to mpeg4 or lavf? mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=mpeg2:tsaf:telecine / -vf scale=720:480,harddup -mc 0 -noskip -srate 48000 -af lavcresample=48000:0:2 -lavcopts / vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=7000:vbitrate=6000:keyint=12 / :trell:mbd=2:precmp=2:subcmp=2:cmp=2:dia=-10:predia=-10:cbp:mv0:vqmin=1:lmin=1 / :dc=10:vpass=1:vb_strategy=2:acodec=ac3:abitrate=224:aspect=16/9:vstrict=0 -ofps 24000/1001 -o $output $input

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sstep with cropdetect
by Micah Chambers 28 Nov '08

28 Nov '08

For some reason I can't get cropdetect to work with sstep. I found a previous message where someone had an issue, but that wasn't really resolved. I am using the latest version of mplayer in svn: here is my configuration flags: Install prefix: ~/bin/mplayer Data directory: ~/bin/mplayer/share/mplayer Config direct.: ~/bin/mplayer/etc/mplayer Byte order: little-endian Optimizing for: Languages: Messages/GUI: en Manual pages: en Enabled optional drivers: Input: ftp pvr tv-teletext tv-v4l2 tv-v4l tv cddb cdda libdvdcss(internal) dvdread(internal) vcd dvb smb network Codecs: x264 xvid libavcodec real xanim faad2 faac libmpeg2 liba52 mp3lib libtheora tremor(internal) libmad liblzo gif Audio output: alsa oss v4l2 sdl mpegpes(dvb) Video output: v4l2 sdl gif89a pnm jpeg png mpegpes(dvb) fbdev aa xvidix cvidix opengl dga xv x11 xover md5sum tga Disabled optional drivers: Input: dvdnav vstream radio tv-dshow live555 nemesi Codecs: libdv libamr_wb libamr_nb qtx win32 musepack libdca speex toolame twolame Audio output: sun openal jack pulse esd arts ivtv dxr2 nas Video output: zr zr2 ivtv dxr3 dxr2 vesa svga caca ggi xmga mga winvidix 3dfx xvmc dfbmga directfb bl xvr100 tdfx_vid s3fb tdfxfb so here is what happens: $ ~/mplayer/mplayer -vf cropdetect -vo null -nosound -sstep 100 -frames 10 Judge\ Dredd.vob MPlayer dev-SVN-r26916-4.2.4 (C) 2000-2008 MPlayer Team CPU: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (Family: 6, Model: 15, Stepping: 11) CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2 Cannot load bitmap font: /home/osmo/.fonts/microsoft-vista/calibri.ttf Playing Judge Dredd.vob. MPEG-PS file format detected. VIDEO: MPEG2 720x480 (aspect 2) 29.970 fps 9800.0 kbps (1225.0 kbyte/s) dvdsublang...judge dredd fi fin en eng dvdsublang...judge dredd fi fin en eng Opening video filter: [cropdetect] ========================================================================== Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES) Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] Opening video filter: [lavc] Could not find matching colorspace - retrying with -vf scale... Opening video filter: [scale] The selected video_out device is incompatible with this codec. Try appending the scale filter to your filter list, e.g. -vf spp,scale instead of -vf spp. VDecoder init failed :( Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2) ========================================================================== Audio: no sound Starting playback... VDec: vo config request - 720 x 480 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. [mpeg1video @ 0xb50d60]removing common factors from framerate VO: [null] 720x480 => 720x540 Mpeg PES V: 208.9 9/ 7 ??% ??% ??,?% 0 0 demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate. V: 0.0 51/ 48 ??% ??% ??,?% 0 0 Could it be a compile flag I have left out or something? Thanks

3 2

2pass: auto-calculation of bitrate?
by Ilya Zakharevich 25 Nov '08

25 Nov '08

I'm looking for a way to let mencoder (I use xvid) to automatically select the 2-pass average video bitrate based on the contents. I'm pretty sure that most (if not the all) of the logic to do it is already there, but I can't find the UI to trigger this behaviour. A) For example: suppose I have 100 videos; now a) append them all together; b) do 2-pass encoding of them all with, e.g., 1200kb/sec bitrate; c) split the result into 100 video files. This way, mencoder will automatically assign some "appropriate" average bitrate to each video. B) Now suppose that I have only 1 video, but I have all 100 logs of pass=1 for all 100 videos. Theoretically, this is all which is needed to do an equivalent of a/b/c for this particular video. How to convince mencoder to use these extra log files? C) Now suppose that I have only 1 video, and only 1 log of pass=1 for this video. It is more or less obvious that all I need from the remaining 99 logs is very short "summaries". How to create the summaries, and how to "feed" them to mencoder? D) And now the last logical step: If of these 99 remaining videos 40% is "action-like", 40% is "arthouse-like", and 20% is animation, then law of big numbers starts to be applicable. Essentially, I won't need to have summaries of the particular videos; I could feed in 40 copies of "average action-like summary", 40 copies of "average arthouse-like summary", and 20 copies of "average animation summary". So if I keep these summaries in ~/.mplayer in action.sum arthouse.sum animation.sum, then I could ask mencoder to do bitrate_from=1200,40*action+40*arthouse+20*animation and it could choose the appropriate bitrate. Is it possible to do now (possibly, with some pre-processing)? Any plans to have this? Thanks, Ilya

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growth bar on linux
by Philippe MONROUX 08 Aug '08

08 Aug '08

I all, First of all I apologize for my poor English... I'm using mencoder in a shell script (linux) and I want to make a growth bar which indicate progress status of encoding with bash and dialog. --gauge seems to be suitable for that but it needs integer which indicate the growth level of encoding. Of course there is mencoder statusline : Pos: 168.1s 4640f (90%) 35fps Trem: 1min 56mb A-V:-0.018 [2378:192] but I don't know how to retrieve the Pos: number every minute by example. Any clue ? Thanks in advance -- philippe

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H.264 video encoding timing
by Gawen ARAB 07 Aug '08

07 Aug '08

Hello, I'm playing with mencoder and H.264 to generate flash readable video. Here is my used params (i encode sound with an other tool) : mencoder {input} -o {output.264} -vf scale={width}:{height} -ovc x264 -x264encopts bitrate={videobitrate}:frameref=8:bframes=3:b_adapt:b_pyramid:weight_b:partitions=all:8x8dct:me=umh:subq=6:trellis=2:brdo:threads=auto:pass={1 or 2}:analyse=all -of rawvideo -nosound Firstly, I think I'm not the only one who wants to do that. Of course feel free to use my params, and maybe to give me your params to improve the stuff :) And secondly, I just launched an encoding of the Elephant Dream movie ( http://orange.blender.org/the-movie) Attributes are 1280:720, videorate to 1200kbs, and it appears it would take about one hour for one pass for 10 minutes movie. My config is - Intel(R) Core(R) 2 Duo T7200 - 4 Mo L2 - 3 Go DDR2 - Debian Etch - Last revision of x264 (compile with the assembler) and mencoder (with x264 support of course ...) NB : Two threads are launched for encoding (two cores). So no problem with multithreading. Aoutch ! 1h for 10 minutes ! I don't even think to encode a full movie, it would take an half day, without 2 passes !! Is my configuration too limited ? Is there any problem with my binary ? Is my configuration efficient ? Is that normal ?? Here is my question :) I'm worrying ... :) Put me at rest. Cheers -- Gawen ARAB, Tel : (+33)0624142491 Web : http://gawgle.net/

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Re: [MEncoder-users] Convert to PSP compatible MP4： Rescaling
by Shuang Wu 31 Jul '08

31 Jul '08

*James Hastings-Trew* wrote: > Unless I am horribly wrong here (under the influence of cold medicine) > you'll need to actually calculate the scale yourself rather than rely on > the -10:272 trick. Then you'll need to put a dsize command in your > filter chain to set the PAR. > > -vf pullup,softskip,scale=xxx:yyy,dsize=xxx:yyy,harddup,unsharp=l3×3:0.7 > > That should fix that problem for you... but that might be the codiene > talking. > > > Thanks for your advise. But it's still not work... And I found if I specify -vf pullup,softskip,scale=xxx:yyy,dsize=xxx:yyy,harddup,unsharp=l3×3:0.7 where xxx is more than 400 pixels, e.g. 416:272, the recaling would be done without any problem, but otherwise, it would definately fail, such as 320:240. I also tried dsize=xxx:yyy:2 and the '-aspect' instruction -aspect xxx:yyy It was not work either.

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Convert to PSP compatible MP4： Rescaling
by Shuang Wu 31 Jul '08

31 Jul '08

hi, I am using the following command to convert movies to PSP compatible MP4. mencoder -sws 9 -vf pullup,softskip,scale=480:272,harddup,unsharp=l3×3:0.7 -ofps 30000/1001 -oac lavc \ -lavcopts aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac \ -ovc x264 -x264encopts bitrate=500:global_header:partitions=all:trellis=1:level_idc=30:threads=4 \ -of lavf -lavfopts format=psp -af volnorm -channels 2 -srate 48000 \ /|input.video|/ -o /|output.psp|/ It works, but if I tried to rescale a movie with original aspect ratio, it sometimes fails. For example, the original movie is 640*480, to keep the original aspect ratio, the vf is set to scale=-10:272 Unfortunately, the output mp4 file extends to 738*544... However, I can see the video stream has the dimension of 368*272... Is there anything wrong? BTW, the following example is from the offical wiki, but the output video cannot be recognised by PSP.. Why? *Example 13.4. encode for PSP* mencoder -ofps 30000/1001 -af lavcresample=24000 -vf harddup -of lavf \ -oac lavc -ovc lavc -lavcopts aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac \ -lavfopts format=psp \ /|input.video|/ -o /|output.psp|/ (OS: Windows XP) Thanks in advance.

2 1

green noise using -vf yadif
by Tobias Brockamp 29 Jul '08

29 Jul '08

Hi all, i found this previous thread about the same problem that i have using "yadif" for deinterlacing, but this thread doesn't solve the problem at all, so i want to start it again. Here is the previous thread: http://thread.gmane.org/gmane.comp.video.mplayer.user/50772 My mencoder command line looks like this: mencoder -vfm ffmpeg,dshow,vfw -cache 51200 -of avi -ovc x264 -ofps 25 -aspect 4:3 -oac mp3lame -srate 44100 -mc 0 -vf yadif,scale=768:576,harddup -x264encopts "keyint=250:min-keyint=25:scenecut=40:bframes=0:b-bias=0:ref=5:deblock=-2,-2:crf=22:ratetol=1.0:vbv-bufsize=0:vbv-init=0.0:ipratio=1.4:pbratio=1.3:chroma-qp-offset=0:rceq=blurCplx^(1-qComp):qcomp=0.6:cplxblur=20.0:qblur=0.5:subq=4:partitions=all:direct-8x8=-1:direct=auto:me=hex:8x8dct:trellis=1:nodct_decimate:nr=0:sar=1/1:fps=25:threads=auto:nopsnr:nossim" -lameopts "cbr:preset=128:mode=0" -o 7_YADIF_01.avi 07.mpg A screenshot of the resulting green line could be found here: http://forum.doom9.org/showthread.php?t=139703 In the previous thread Carl Eugen Hoyos suggested this: "Do you see them when you try: mplayer capture.dv -vf yadif mplayer capture.dv -vf yadif,scale=-10:-1 mplayer capture.dv -vf scale=-10:-1,yadif or only if you try mencoder capture.dv -vf yadif -ovc lavc -oac copy -o test.avi mencoder capture.dv -vf yadif,scale=-10:-1 -ovc lavc -oac copy -o test.avi mencoder capture.dv -vf scale=-10:-1,yadif -ovc lavc -oac copy -o test.avi mencoder capture.dv -vf yadif -ovc x264 -oac copy -o test.avi mencoder capture.dv -vf yadif=1 -fps 50 -ofps 50 -ovc x264 -oac copy -o t.avi " I tried this all out and using mplayer the green noise isn't there but all mencoder lines results with green noise, so it seems to be a problem with mencoder.? I also tried encoding my MPG File with megui (x264) using an avisynth script including yadif, the result has no green noise. So it would be nice if someone could help out here cause this problem seems not to be solved since last posting in 2007. Kind regards, T. Brockamp

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turbo
by tripp 28 Jul '08

28 Jul '08

hi, i'm interested in knowing exactly what turbo changes on the first pass, (lavc) i know it disables trellis, but what else? ty tripp

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