January 2010 - 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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Encoding interlaced content: what am I doing wrong?
by Martijn van Beurden 05 Feb '10

05 Feb '10

Good afternoon, Currently I'm busy transcoding Hi8 video to DVDs. I've already done 2 tapes, using pp=fd as deinterlacer, but very recently I discovered what interlacing is exactly, and I'm convinced I should try keep the interlacing, so I'm adjusting my toolchain. First I capture the video with mencoder piped to x264 (just for --preset and --tune setting convenience) and arecord to capture sound in 24-bit format, then amplify it, turn it to 16-bit and merge it into a .mkv file. So far so good, this is quite easy to keep interlaced, just pass --interlaced to x264. I'm looking which settings to use to encode interlaced material, but some of my tests seem to fail. I used this command to generate a file test.mpg mencoder -edl tape3.edl -hr-edl-seek tape3.mkv -vf crop=686:560:16:4,scale,expand=720:576:16:0 -nosound -ovc lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:turbo:vpass=1:ilme:ildct:vstrict=0:threads=2:vbitrate=5800:keyint=15 -of mpeg -mpegopts format=dvd:tsaf -o test.mpg So, as you can see, I'm messing around getting the first pass right. (Second pass shouldn't be a problem) The resulting video is clearly interlaced, it works when played with mplayer with -vf pp=fd, but when using -vf tfields=0:0,scale the framerate doesn't double (or, when played at 0.25x, motion isn't that smooth) while it does when I try at tape3.mkv, the original capture. What am I doing wrong? I suspect there's something wrong with the container, the video not being marked as deinterlaced or something...? Or is my test method wrong and is this encode fine? Thanks in advance! Kind regards, Martijn van Beurden

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Please help to improve syntax
by Al Bogner 31 Jan '10

31 Jan '10

I want to create a x264-file in a mkv-container from a XSVCD, which source was a VHS-PAL-Video originally. I ripped the xsvcd with this command: mplayer -dumpstream vcd://2 Then I extracted the audio to mp3 with vbr. Is vbr ok or should it be cbr? I wonder, why smplayer doesn't play the sound of the merged result, while mplayer, xine and others do: mencoder stream.dump -of rawaudio -oac mp3lame -lameopts preset=standard -ovc copy -o movie.mp3 & I want to deinterlace, denoise and sharpen the source. Would you change the options? mencoder stream.dump -ovc x264 -aspect 4/3 -x264encopts qp=30:threads=auto:pass=1 -vf yadif=0,softskip,harddup,hqdn3d,unsharp=l:5x5:0.5 -nosound -of rawvideo -o /dev/null mencoder stream.dump -ovc x264 -aspect 4/3 -x264encopts qp=30:threads=auto:pass=2 -vf yadif=0,softskip,harddup,hqdn3d,unsharp=l:5x5:0.5 -nosound -of rawvideo -o movie.264 At the end I merged the files: mkvmerge -o movie.mkv movie.264 movie.mp3 Al

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movie to image sequence
by louis p 30 Jan '10

30 Jan '10

ca i convert a movie to image sequence?? i need to convert some mov to tga sequence can mencoder can do this??? thanks in advance louis

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AC3 dump reports wrong length for audio....bug?
by Another Sillyname 29 Jan '10

29 Jan '10

Hi If I do a -of rawaudio for an AC3 stream with a -ss xxxx and a -endpos yyyy and the original file (it's a .ts stream file) is over a certain time length then the corresponding AC3 dump instead of reporting the endpos length (which surely should be the correct behaviour) instead reports the 'actual end of stream time' less the '-ss time' as the stream timelength. This becomes a problem when then trying to mux them using something link mkvmerge as the two streams have different time lengths and therefore the output stream cannot be searched properly (also the output stream reports the audio stream length rather then the video stream length. Any ideas or pointers gratefully received.

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Converting video from HD-PVR
by Andrew Berg 27 Jan '10

27 Jan '10

I'm trying to convert these videos again, and while MEncoder can handle them without crashing now, I still have trouble with them. Frame rate is the major problem now. My typical encodes (mostly DVD rips) consist of these lines: mencoder [input] -msglevel all=0:statusline=5 -of avi -oac copy -ovc x264 -x264encopts crf=19:keyint=300:keyint_min=30:level_idc=41:frameref=15:mixed_refs:bframes=4:b_adapt=2:me_range=24:direct_pred=auto:partitions=all:cabac:8x8dct:me=hex:subq=5:threads=auto:nointerlaced:nopsnr:nossim -vf pp=lb,hqdn3d=0:0:6:6,harddup -o output.avi ffmpeg -i output.avi -f wav - 2>nul | neroaacenc -ignorelength -q 0.3 -if - -of output.m4a mp4box -aviraw video output.avi mp4box -add output_video.h264:fps=29.97 -add output.m4a -new output.mp4 I've had some success adding -demuxer lavf and -ofps 30000/1001 to the first line, but sync is off. If I omit -ofps 30000/1001, it behaves as if the input were 60000/1001fps, which I know is not true. I even tried using filmdint as if the video were telecined 60fps, and got jerky playback. I can provide a sample of the video, but it's almost 100MB per minute since I record at the max 13.5Mbps (local ABR). Is there anything I could try?

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What is the problem with faac ?
by PyProg PyProg 26 Jan '10

26 Jan '10

Hello, Can you help me ?. What is the problem ?. toto@kubuntu-1:~/blender$ mencoder "/home/toto/blender/inicio.mpg" -oac faac -faacopts mpeg=4:raw:br=128 -of lavf -lavfopts format=mp4 -ovc x264 -x264encopts bitrate=1200 -o "/home/toto/blender/zzzzz.mp4" MEncoder UNKNOWN-4.4.1 (C) 2000-2009 MPlayer Team success: format: 0 data: 0x0 - 0x70cb4 AVI file format detected. [aviheader] Video stream found, -vid 0 [aviheader] Audio stream found, -aid 1 VIDEO: [DIV3] 352x288 24bpp 25.000 fps 370.4 kbps (45.2 kbyte/s) [V] filefmt:3 fourcc:0x33564944 size:352x288 fps:25.000 ftime:=0.0400 ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 11025 Hz, 1 ch, s16le, 45.2 kbit/25.60% (ratio: 5644->22050) Selected audio codec: [ffadpcmms] afm: ffmpeg (FFmpeg MS ADPCM audio) ========================================================================== ** MUXER_LAVF ***************************************************************** REMEMBER: MEncoder's libavformat muxing is presently broken and can generate INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer will play these INCORRECT files as if nothing were wrong! ******************************************************************************* OK, exit. Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1 ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffdivx] vfm: ffmpeg (FFmpeg DivX ;-) (MSMPEG-4 v3)) ========================================================================== AE_FAAC, counldn't set specified parameters, exiting Exiting... a+ -- http://ekd.tuxfamily.org http://ekdm.wordpress.com http://lprod.org/wiki/doku.php/video:encodage:avchd_converter

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Enable mbtree
by Баймуратов Г. М. 25 Jan '10

25 Jan '10

How could I know if mbtree is enabled? Forum on doom9 says that there should be stats.mbtree in folder, where file is encoding, but I don't see it These are x264 encoding options -x264encopts crf=20:subme=10:frameref=16:bframes=32:b_adapt=2:b_pyramid=normal:weightp=2:partitions=all:8x8dct:direct_pred=auto:me=tesa:trellis=2:merange=32:aq-mode=4:threads=auto:analyse=all Does it require manual turning on? -- Баймуратов Гаяр icq: 1931143

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