October 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

3 9

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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2 pass encoding failed witg VP6 codec
by guillaume montard 26 Mar '09

26 Mar '09

Hi, I m trying to encode a .mov video to flv using the great VP6 codec. I m able to encode it in 1-pass, but i would like to make a 2-pass. I googled for like day and i m still stuck.... Here is my code line : mencoder testmencoder.mov -o test.flv -ovc vfw -xvfwopts codec=vp6vfw.dll:compdata=1passvodeclic.mcf -nosound -vf yadif,scale,flip -of lavf mencoder testmencoder.mov -o test.flv -ovc vfw -xvfwopts codec=vp6vfw.dll:compdata=2passvodeclic.mcf -nosound -vf yadif,scale,flip -of lavf My problem is that mencoder fail doing the 2 pass. Mencoder simply stop doing nothing : VDec: vo config request - 1024 x 768 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Opening video filter: [flip] Movie-Aspect is undefined - no prescaling applied. [swscaler @ 0x6622f0]SwScaler: using unscaled yuv420p -> bgr24 special converter Opening video filter: [expand] Expand: -1 x -1, -1 ; -1, osd: 0, aspect: 0.000000, round: 1 Starting compression: Input format: biSize 40 biWidth 1024 biHeight 768 biPlanes 1 biBitCount 24 biCompression 0x0 ('') biSizeImage 2359296 Output format: biSize 40 biWidth 1024 biHeight 768 biPlanes 1 biBitCount 24 biCompression 0x32365056 ('VP62') biSizeImage 1576960 Does any one have an hint ? Thanks -- Guillaume MONTARD guillaume.montard(a)gmail.com

2 1

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

5 11

First 111 frames duplicated
by double 31 Oct '08

31 Oct '08

Hi, If I transcode a wmv2,wmav2 video to whatever, mencoder will duplicate the first 111 frames: 111 duplicate frame(s)! As a result A/V is completly out of sync. Is there anything I can to to prevent this duplicate frames on startup? Command line: mencoder http://doppelbauer.name/error.wmv -of lavf -ofps 25 -vf scale=320:240 -ovc lavc -oac lavc -lavcopts vcodec=wmv1:vqscale=2:acodec=wmav1:abitrate=128:autoaspect -mc 0 -channels 2 -srate 44100 -o test.wmv >txt 2>&1 Output: MEncoder dev-SVN-r27659-4.2.3 (C) 2000-2008 MPlayer Team CPU: Quad-Core AMD Opteron(tm) Processor 2344 HE (Family: 16, Model: 2, Stepping: 3) CPUflags: Type: 16 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1 Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2 Resolving doppelbauer.name for AF_INET... Connecting to server doppelbauer.name[209.59.152.123]: 80... Cache size set to 320 KBytes success: format: 0 data: 0x0 - 0x47a6ee ASF file format detected. [asfheader] Audio stream found, -aid 1 [asfheader] Video stream found, -vid 2 VIDEO: [WMV2] 320x240 24bpp 1000.000 fps 256.0 kbps (31.2 kbyte/s) [V] filefmt:6 fourcc:0x32564D57 size:320x240 fps:1000.000 ftime:=0.0010 ========================================================================== Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16005->176400) Selected audio codec: [ffwmav2] afm: ffmpeg (DivX audio v2 (FFmpeg)) ========================================================================== ** 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 filter: [scale w=320 h=240] ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffwmv2] vfm: ffmpeg (FFmpeg WMV2/WMV8) ========================================================================== VDec: vo config request - 320 x 240 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. [swscaler @ 0x8e6edf0]using unscaled yuv420p -> yuv420p special converter videocodec: libavcodec (320x240 fourcc=31564d57 [WMV1]) [VE_LAVC] Using constant qscale = 2.000000 (VBR). New_Face failed. Maybe the font path is wrong. Please supply the text font file (~/.mplayer/subfont.ttf). subtitle font: load_sub_face failed. New_Face failed. Maybe the font path is wrong. Please supply the text font file (~/.mplayer/subfont.ttf). subtitle font: load_sub_face failed. VIDEO CODEC ID: 18 AUDIO CODEC ID: 15007, TAG: 0 Writing header... *111 duplicate frame(s)!* Pos: 4.5s 1f ( 0%) 0.00fps Trem: 0min 1mb A-V:0.000 [10:0] [...snip...] Pos: 95.5s 2279f (100%) 106.76fps Trem: 0min 7mb A-V:-0.035 [508:128] Flushing video frames. Writing index... Video stream: 508.550 kbit/s (63568 B/s) size: 6072084 bytes 95.520 secs 2279 frames Audio stream: 128.000 kbit/s (16000 B/s) size: 1536524 bytes 96.033 secs

2 1

From NTSC to PAL (avi)
by Søren Juul 29 Oct '08

29 Oct '08

Hi My dvd-player (Philips DVDR3595H) can not play AVI files encoded as NTSC (at least no watch-able), so I have been using -fps 25 to re-encode them to PAL, now I can see them, but slowly the sound gets more and more behind. I have tried with "-fps 25 -ofps 25" but I got the same problem. I always use "-oac copy -ovc copy", to keep up speed. They play fine in mplayer, I guess this is because mplayer can sync automatically some how, is there any way I can turn the sync off, so I can test with mplayer? What could be the problem with the files? Does someone know how to covert a avi file from NTSC to PAL properly? -- Med venlig hilsen / Kind regards Søren Juul

3 4

Loosing sync
by Alex Samad 28 Oct '08

28 Oct '08

Hi I am trying to convert my dvd's onto my media box. I have used vocopy to extract/copy the dvd's to my hd and I am using this script to convert to a h264/DTS(copied) .mkv file I have edited out comments and spaces DVDT="${DVDT:-1}" # Set with "-dvd-device /exports/video/ISO/XMEN2_DISC1/" DVDDEVICE=${DVDDEVICE:-""} AID=${AID:-'-aid 128'} INF=${INF:-"DVD://$DVDT"} OUTD=${OUTD:-"/exports/video/Movies/UNCLASSIFIED"} #BASE=${BASE:-"UNKNOWN"} BITRATE=${BITRATE:-1000} PASSCOMMON='subq=6:partitions=all:8x8dct:frameref=3:b_pyramid:me=umh:bframes=4:weight_b:nopsnr:threads=auto:brdo:trellis=1:level_idc=41:direct_pred=auto:bime' PASS1='pass=1:turbo=1' PASS2='pass=2' ENC1="x264 -x264encopts $PASS1:$PASSCOMMON:bitrate=$BITRATE" ENC2="x264 -x264encopts $PASS2:$PASSCOMMON:bitrate=$BITRATE" AENC=${AENC:-""} OAC=${OAC:-"copy"} OACOPT=${OACOPT:-""} CROP=${CROP:-"crop=720:416:0:80"} FILTER1="$CROP,spp,scale,harddup" FILTER2="$CROP,spp,scale,harddup" OUTF="$OUTD/$BASE.mkv" PASSLOG="$BASE.divx2pass.log" WRKDIR="$(mktemp -t -d -p $TMP)" TMPF="$WRKDIR/$BASE.avi" nice mencoder -quiet \ -vf $FILTER1 \ -ovc $ENC1 \ -oac "$OAC" $OACOPT \ -passlogfile "$PASSLOG" \ -o /dev/null \ "$INF" $ADDOPT $AID $DVDDEVICE nice mencoder -quiet \ -vf $FILTER2 \ $AENC \ -ovc $ENC2 \ -passlogfile "$PASSLOG" \ -oac "$OAC" $OACOPT \ -o "$TMPF" \ "$INF" $ADDOPT $AID $DVDDEVICE # remux into mkv container nice mkvmerge -q -o "$OUTF" --title "$BASE" --default-language 'en' "$TMPF" When I watch this the sounds drifts out sync this is the output from mplayer -vo null -identify -frames 0 -dvd-device /exports/video/ISO/XMEN_1_5_DISC1 DVD://1 -aid 138 ============ audio stream: 1 format: dts (5.1) language: en aid: 138. ID_AUDIO_ID=138 ID_AID_138_LANG=en ID_VIDEO_ID=0 MPEG-PS file format detected. ID_AUDIO_ID=131 ID_AUDIO_ID=128 ID_AUDIO_ID=138 VIDEO: MPEG2 720x576 (aspect 3) 25.000 fps 7500.0 kbps (937.5 kbyte/s) ID_FILENAME=DVD://1 ID_DEMUXER=mpegps ID_VIDEO_FORMAT=0x10000002 ID_VIDEO_BITRATE=7500000 ID_VIDEO_WIDTH=720 ID_VIDEO_HEIGHT=576 ID_VIDEO_FPS=25.000 ID_VIDEO_ASPECT=0.0000 ID_AUDIO_FORMAT=8193 ID_AUDIO_BITRATE=0 ID_AUDIO_RATE=0 ID_AUDIO_NCH=0 ID_LENGTH=6002.40 ID_SEEKABLE=1 ========================================================================== Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo config request - 720 x 576 (preferred colorspace: Mpeg PES) VDec: using Mpeg PES as output csp (no 0) VO: [null] 720x576 => 1280x1024 Mpeg PES [fs] [vm] [zoom] Selected video codec: [mpegpes] vfm: mpegpes (MPEG-PES output (.mpg or DXR3/IVTV/DVB/V4L2 card)) ========================================================================== ID_VIDEO_CODEC=mpegpes ========================================================================== Opening audio decoder: [libdca] DTS decoding with libdca Stream with high frequencies VQ coding AUDIO: 48000 Hz, 2 ch, s16le, 768.0 kbit/50.00% (ratio: 96000->192000) ID_AUDIO_BITRATE=768000 ID_AUDIO_RATE=48000 ID_AUDIO_NCH=2 Selected audio codec: [dts] afm: libdca (DTS-libdca) ========================================================================== AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) ID_AUDIO_CODEC=dts and from the resultant file mplayer -vo null -identify -frames 0 X-Men\ 1.5\ $2000$.mkv Playing X-Men 1.5 (2000).mkv. Cache fill: 0.00% (0 bytes) ID_VIDEO_ID=0 [mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0 ID_AUDIO_ID=0 ID_AID_0_LANG=eng [mkv] Track ID 2: audio (A_DTS), -aid 0, -alang eng [mkv] Will play video track 1. Matroska file format detected. VIDEO: [avc1] 704x432 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) ID_FILENAME=X-Men 1.5 (2000).mkv ID_DEMUXER=mkv ID_VIDEO_FORMAT=avc1 ID_VIDEO_BITRATE=0 ID_VIDEO_WIDTH=704 ID_VIDEO_HEIGHT=432 ID_VIDEO_FPS=25.000 ID_VIDEO_ASPECT=2.3171 ID_AUDIO_FORMAT=8193 ID_AUDIO_BITRATE=0 ID_AUDIO_RATE=48000 ID_AUDIO_NCH=6 ID_LENGTH=6002.39 ID_SEEKABLE=1 ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== ID_VIDEO_CODEC=ffh264 ========================================================================== Opening audio decoder: [libdca] DTS decoding with libdca Stream with high frequencies VQ coding AUDIO: 48000 Hz, 2 ch, s16le, 768.0 kbit/50.00% (ratio: 96000->192000) ID_AUDIO_BITRATE=768000 ID_AUDIO_RATE=48000 ID_AUDIO_NCH=2 Selected audio codec: [dts] afm: libdca (DTS-libdca) ========================================================================== AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) ID_AUDIO_CODEC=dts When I tested the output'ed .avi file seemed to be okay

1 0

I need to change an avi video to rmvb format
by Roberto José Blandino Cisneros 27 Oct '08

27 Oct '08

I have been trying to change an avi file to rmvb but i have had problems to understand it, i need a guide or example to begin with. I found one example but it did not compress anything. it was something like this; http://www.ubuntu-es.org/index.php?q=node/38552&page=1 but i always find rmvb to avi, but i do not want that. i want to compress the avi into a rmvb format. -- >> Roberto José Blandino Cisneros >> Nicaragua, Nicaragua http://gnu-linux-opensource.blogspot.com/ http://www.cert-ni.net.ni/ http://softwarelibre.uni.edu.ni/

1 0

Comparison of Audio codecs for DVD src
by Alex Samad 27 Oct '08

27 Oct '08

Hi I am in the process of coping my dvd's to hd (to play on my mini mac with plex on it). I have decided on x264 for the video codec, but I am wondering what to use for the audio. I have started with Xmen 1.5 & 2. Both dvd's have DTS & AC3 and stereo. I have started my tests with -oac copy of the dts and comparing it to a faac of the DTS source. the aac doesn't sounds as loud, doesn't seem to have the oopmh, i used -af volnorm=2,sub,channels=6 and faacopts object=2:tns:mpeg=4. I am thinking maybe just stick with the DTS original ? The problem I see when i use -oac copy, is when i run file <filename> it says its a 2 channel file - but when I play it back it uses 5.1 Alex -- "I think --tide turning --see, as I remember --I was raised in the desert, but tides kind of --it's easy to see a tide turn --did I say those words?" - George W. Bush 06/14/2006 Washington, DC in response to the question "Is the tide turning in Iraq?"

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