May 2009 - 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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yadif: what does "spatial interlacing check" mean?
by Christian Ebert 29 Jun '10

29 Jun '10

Hi, TFM say about the 2 and 3 options for yadif that they "skip spatial interlacing check". What does this mean exactly? What's the better way to go if I want better quality regardless of encoding time? And would recommendations differ if I use yadif in connection with mcdeint? TIA c -- \black\trash movie _C O W B O Y_ _C A N O E_ _C O M A_ Ein deutscher Western/A German Western -->> http://www.blacktrash.org/underdogma/ccc.html -->> http://www.blacktrash.org/underdogma/ccc-en.html

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issues for time-lapse video encoding
by Hugh Secker-Walker 14 Jun '09

14 Jun '09

Hi Folks, I'm creating and processing time-lapse movies of outdoor scenes using mencoder (or ffmpeg) to do the capture from a webcam, and then mencoder to process into a playable video. I'm using an Ubuntu server setup, and the initial video comes in from a USB webcam in video4linux2 format. I'm capturing 1280x1024 frames at 0.1 frame per second, i.e. 6 frames per minute. The intended playback is 30 fps. I have two questions: 1) Since I want to use two-pass processing of the captured video, I need to do the initial capture with as little degredation as possible. I'd like e.g. 3000 frames to go into about 1gB in the oringial captured video. Is there a recommended codec/setting for this? I've tried rawvideo and ffv1, but these generate too much data. So I need some compression. Given that the size of the compressed video at this point isn't a big issue, which codec will degrade the images the least or have the simplest behavior/results? BTW, I'm currently using the mjpeg codec, but there's no control that I can see (ffmpeg) for the compression that it's doing.... 2) I want to do some filtering of the resulting video. In particular, it would be nice to remove all the objects, e.g. birds, that appear in only a single frame. I can imagine that some sort of median filter would do the job (e.g. median for each pixel across 7 frames). What should I be looking at for this kind of filtering? It's a kind of denoising, but the extent of the noisy object can be quite large, but always only for a single frame. Relatedly, is there a codec that would be best suited to the time-lapse material? I've toyed with wmv2, mpeg4, and x264 -- but experimenting with just the set of controls that I've seen mentioned in FAQs is daunting, and I haven't yet seen anything that specifically addresses the nature of time-lapse video of outdoor scenes. So, I'd also appreciate any pointers to information about the encoding issues for time-lapse video. Thanks in advance, -Hugh

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Mac OSX binaries
by James Hastings-Trew 04 Jun '09

04 Jun '09

I know I have asked about this in the past. I've attempted a few times to get mencoder and mplayer to build properly on my Mac, but the goal seems elusive, despite being reassured that the process is easy. There's always a library or dependency that's missing and the resulting binary is never complete with all needed features. Has anyone got a working binary for mencoder and mplayer for the mac that was built from up-to-date sources? The links from the Mplayer page point to a Mplayer only build ( http://www.haque.net/software/mplayer/mplayerosx/builds/ ) or binaries that are over 5 years old ( http://sourceforge.net/project/showfiles.php?group_id=62947 ). Has someone got a working set of binaries that they'd care to share with me? Thanks. __________ Information from ESET NOD32 Antivirus, version of virus signature database 4116 (20090529) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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Video framerate problem
by Andrew Berg 02 Jun '09

02 Jun '09

I'm in the process of ripping my DVDs, and I came across one that gives me problems. I ripped 3 film DVDs today, all with the same settings (except for hqdn3d values), and 2 came out fine. Unfortunately, there is one with the video finishing before the audio. I have no idea why two were fine, and this one is bad. They're all films, and I used the same process for all. I looked over the movie quickly and didn't notice MPlayer playing it at anything but 24000/1001 FPS except for a tiny bit at the beginning. mencoder dvd://1 -dvd-device /j/ -msglevel all=1:statusline=5 -fps 30000/1001 -ofps 24000/1001 -of avi -oac copy -ovc x264 -x264encopts crf=19:keyint=300:keyint_min=30:level_idc=41:frameref=4:mixed_refs:weightb:bframes=4:b_adapt=2:b_pyramid:me_range=24:direct_pred=auto:partitions=all:cabac:8x8dct:me=hex:trellis=1:subq=5:threads=auto:nointerlaced:nopsnr:nossim -vf pullup,softskip,hqdn3d,harddup -o movie.avi ffmpeg -i movie.avi -f wav -ac 2 -ar 48000 - 2>nul | neroaacenc -ignorelength -q 0.25 -if - -of movie.m4a mp4box -aviraw video movie.avi mp4box -add movie_video.h264:fps=23.976 -add movie.m4a -new movie.mp4

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Telecine option appears to harm 24 fps MPEG-2 output
by L Lee 30 May '09

30 May '09

After consulting this list and researching documentation, I decided to create standard DVD source files using this option string when my encoding options yield 24 fps output: -mpegopts format=dvd:telecine:tsaf But when I create a DVD using DVD author with no further encoding, all set top players tested (even a new Samsung Blu-ray player) intermittently add stutters at regular intervals (more than one second, less than two, by my guess). When I change that option string to -mpegopts format=dvd:tsaf the output DVD plays flawlessly wherever I play it. Why would that be happening? Am I using the option wrong, or leaving something else out? Thanks. -- Laine Lee

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Framerate keeps switching
by Andrew Berg 29 May '09

29 May '09

I have a few DVDs of films, and MPlayer keeps switching between 24000/1001 fps and 30000/1001 fps. I have two questions: Why does it keep switching? Will MEncoder convert it properly (with -fps 30000/1001 -ofps 24000/1001 ... -vf pullup,softskip... )?

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A/V sync issues with separately encoded streams
by Andrew Berg 27 May '09

27 May '09

I find that if I copy the audio along with the transcoded video into an AVI container, it works, but if I use the -nosound option, whether I put the video stream into a container or not, it doesn't work. My guess is that there is delay information in the original DVD title that isn't stored unless I process both the audio and video. If that is the case, how do I get MEncoder (or MPlayer) to tell me the delay info (so I can relay it to MP4Box when I mux the transcoded streams)?

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adding audio track
by rulet1＠meta.ua 23 May '09

23 May '09

How to add audio track to mpeg2 file and to save it also in mpeg2 with the same quality? ______________________________ Получить адрес @meta.ua http://webmail.meta.ua/

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