December 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

12 43

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

VP6 encoding
by Artem Yunusov 26 Mar '09

26 Mar '09

Hello, I tried VP6 with vp6vfw.dll, the resulting quality was quite low, is there any way to set quality to more higher level on Mac? Also I noticed that resulting codec is VP62, but i would like to use VP6F, is it possible ? Thanks!

2 1

Compression too great, bitrate too low on detelecined deinterlaced mpeg2video
by Laine Lee 02 Jan '09

02 Jan '09

I'm converting 720p 24 fps sources to mpeg2video with the following command. 100 minutes or more of video with highly variable motion content is being compressed too greatly but mencoder tells me I don't need the bitrate I'm asking for. Output pictures are not pixilated, but they are softened too much. The bitrate values come straight from documentation, but are apparently being ignored. How do I get the output closer in size and bitrate to the input? I don't care about how long the encoding process takes, and I don't care much about limiting output file size. I don't care about the deinterlacing, but I went through an extreme amount of experimentation to find a filter chain that would perform the necessary pullup correctly, so I'm not likely to change much of that. I'm pouring pretty much everything into the lavcopts I can find, so some of it is probably not needed. Please advise about that, too. Thanks! mencoder -oac copy -ovc lavc -of mpeg -mpegopts format=dvd:tsaf -vf framestep=2,filmdint=fast=0,softskip,harddup,scale=720:480,hqdn3d=2:1:2 -noskip -lavcopts vcodec=mpeg2video:vb_strategy=1:brd_scale=2:trell:mbd=2:precmp=2:subcmp=2:cm p=2:dia=-10:predia=-10:cbp:mv0:vqmin=1:lmin=1:dc=10:vrc_buf_size=1835:vrc_ma xrate=9800:vbitrate=8000:keyint=15:aspect=16/9:vstrict=0:vpass=1:turbo -ofps 24000/1001 -o /dev/null '/infile.mpg' && mencoder -oac copy -ovc lavc -of mpeg -mpegopts format=dvd:tsaf -vf framestep=2,filmdint=fast=0,softskip,harddup,scale=720:480,hqdn3d=2:1:2 -noskip -lavcopts vcodec=mpeg2video:trell:mbd=2:precmp=2:subcmp=2:cmp=2:dia=-10:predia=-10:cbp :mv0:vqmin=1:lmin=1:dc=10:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=8000:k eyint=15:aspect=16/9:vstrict=0:vpass=2 -ofps 24000/1001 -o 'outfile.mpg' 'infile.mpg' -- Laine Lee

2 7

pullup useless?
by Daniel Gnoutcheff 30 Dec '08

30 Dec '08

Hello all, OK, I'm working on making a DVD backup of a VHS tape of an old animated movie. I've already done the capture, stored in a huge .avi, video compressed with the lossless ffvhuff with the hope of making the thing fit on my HD without losing any information. I'm in NTSC country, and the movie is obviously telecined via 2:3 pulldown. I want to do an inverse pulldown on it. Now, the detc filter works - but not perfectly. It seems to miss things when there is only a little bit of isolated movement. So I'd like to use one of the reputedly better pulldown and filmdint. But there's a slight problem. pulldown does nothing. At all. mencoder runs, but the video comes out unchanged and still telecined. Now, I might put this down to noise - the VHS is crappy, the VCR is crappy, and the TV capture card is crappy - but there are some scenes in the source video (e.g. during pans) where the telecining is *really* obvious. But to my horror, pullup doesn't get a clue. I've tried adjusting pullup's parameters to help - I made it ignore some junk on the top and bottom, and I adjusted the sc paramiter. My latest attempt: mencoder sw7d-telcine.avi -vf pullup=2:2:4:4:-1:0,softskip -oac copy -ovc copy -o test.avi sw7d-telcine.avi is a sort clip extracted from the big capture that shows a pan, with very obvious telecine. I understand that this command has pullup ignore 16 pixels on the left, 16 on the right, 8 on the top, and 8 on the bottom. The resulting test.avi is indistinguishable from sw7d-telcine.avi, telecine and all. Any ideas? How should I make pullup deal with noise? How to I give this thing a clue, especially given the detc handles the same clip beautifully? Thanks all, Daniel

8 15

IMX D10 MXF + 8 channel audio
by fast＠it-media.by 27 Dec '08

27 Dec '08

System: uname -a FreeBSD coder.com 7.0-RELEASE FreeBSD 7.0-RELEASE #2: Sun Jul 20 20:40:03 UTC 2008 coder@coder.com:/usr/obj/usr/src/sys/CODER i386 Options coding: ======================================================================================================================== #Path to mencoder Mencoder="/usr/local/bin/mencoder" #Configure sound coder OAC="-oac mp3lame -lameopts br=128:mode=3:q=3:vol=2 -srate 22050" #Configure video codec OVC="-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=200:mbd=2:autoaspect:threads=2 -vf scale=320:240 -mc 0 -noskip -nobps" $Mencoder /TEMP/HIRES/1.mxf -o /home/itm/1.avi $OAC $OVC #-nosound ======================================================================================================================== coder# ./test.sh MEncoder 1.0rc2-4.2.1 (C) 2000-2007 MPlayer Team CPU: Intel(R) Xeon(R) CPU E5335 @ 2.00GHz (Family: 6, Model: 15, Stepping: 11) CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. success: format: 0 data: 0x0 - 0xfdd82800 libavformat file format detected. [lavf] Video stream found, -vid 0 [lavf] Audio stream found, -aid 1 VIDEO: [mpg2] 720x608 0bpp 25.000 fps 30000.0 kbps (3662.1 kbyte/s) [V] filefmt:44 fourcc:0x3267706D size:720x608 fps:25.00 ftime:=0.0400 ========================================================================== Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 48000 Hz, 8 ch, s16le, 0.0 kbit/0.00% (ratio: 0->768000) Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) ========================================================================== 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: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2)) ========================================================================== MP3 audio selected. VDec: vo config request - 720 x 608 (preferred colorspace: Planar 422P) VDec: using Planar 422P as output csp (no 3) Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. SwScaler: reducing / aligning filtersize 10 -> 12 SwScaler: reducing / aligning filtersize 10 -> 12 SwScaler: reducing / aligning filtersize 12 -> 10 SwScaler: reducing / aligning filtersize 22 -> 20 [swscaler @ 0x87b2670]SwScaler: BICUBIC scaler, from yuv422p to yuv420p using MMX2 [swscaler @ 0x87b2670]SwScaler: using n-tap MMX scaler for horizontal luminance scaling [swscaler @ 0x87b2670]SwScaler: using n-tap MMX scaler for horizontal chrominance scaling [swscaler @ 0x87b2670]SwScaler: using n-tap MMX scaler for vertical scaling (YV12 like) [swscaler @ 0x87b2670]SwScaler: 720x608 -> 320x240 videocodec: libavcodec (320x240 fourcc=34504d46 [FMP4]) [VE_LAVC] High quality encoding selected (non-realtime)! Writing header...1f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0] ODML: vprp aspect is 4:3. Writing header... ODML: vprp aspect is 4:3. Pos: 66.1s 1653f ( 4%) 100.88fps Trem: 6min 19mb A-V:0.000 [49:46] Too many audio packets in the buffer: (1093 in 33576960 bytes). Maybe you are playing a non-interleaved stream/file or the codec failed? For AVI files, try to force non-interleaved mode with the -ni option. Flushing video frames. Writing index... Writing header... ODML: vprp aspect is 4:3. Video stream: 49.281 kbit/s (6160 B/s) size: 407062 bytes 66.080 secs 1653 frames Audio stream: 46.392 kbit/s (5798 B/s) size: 386130 bytes 66.586 secs If i'am encode with options -nosound or pcm - all work fine. But I need to get as small as possible file size, and would like to encode audio track to mp3. mailto:fast@it-media.by

3 2

Error reading audio: Input/output error
by Bruno Buys 26 Dec '08

26 Dec '08

Hi people, I have the exact same problem recording from mencoder as this user: http://www.itdp.de/mplayer-users/2006-07/msg00051.html Its a debian sid system with both 2.6.26-686 and 2.6.18-6-k7. The tv card is a saa7134-based. I have no oss installed here, only alsa. The audio out of the tv card plugs in the line in of the audio card (via vt8237 onboard). The computer is a AMD Sempron 3400+ with Abit KV8 Pro mobo, socket 754. No new fancy hw. Watching tv with both tvtime and mplayer works flawlessly. The mencoder line that used to work is: mencoder -tv driver=v4l2:chanlist=us-cable:channel=3:normid=9:input=0:outfmt=i420:mjpeg -ovc lavc -lavcopts vbitrate=1400 -oac twolame -o $HOME/tv.avi tv:// Its actually a simplified version, as I have tried lots of slightly different lines, with varying parameters, to no avail. The first working lines had more lavcopts settings and video filters. Always worked, and for a long time. Now, all I get is: ...(cut)... VDec: vo config request - 352 x 288 (preferred colorspace: Planar I420) VDec: using Planar I420 as output csp (no 0) Movie-Aspect is undefined - no prescaling applied. videocodec: libavcodec (352x288 fourcc=34504d46 [FMP4]) Selected video codec: [rawi420] vfm: raw (RAW I420) ========================================================================== ae_twolame, 1 audio channel, forcing mono mode Forcing audio preload to 0, max pts correction to 0. 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. Pos: 0.0s 1f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0] Error reading audio: Input/output error After a while video buffer gets full, frames dropped, etc etc. Need to kill mencoder. It's so weird. How come it works and then it suddenly doesn't? I have also tried with both mencoder from debian packages and cvs/svn downloaded and compiled, the exact same error happens. Thanks everybody for any ideas!

4 8

can I add two subtitle in a video at one time
by com wdo 26 Dec '08

26 Dec '08

I want to add two language subtitles to a video using two srt file, a line show English subtitle and next line show Chinese, is it possible? -- http://www.watch-drama-online.com

2 1

Merging audio and video file
by Rodolfo Medina 25 Dec '08

25 Dec '08

Hi. I posted my problem to the ffmpeg-user mailng list but got no reply. I hope someone from this list can help me. What I'm trying to do is: first, merging audio.waw and movie.m2v into movie.mpg; then, `cat' movie.mpg in front of second-movie.vob so to have total-movie.mpg. Can anyone suggest the right mencoder syntax to do the first step? With ffmpeg, I did: $ ffmpeg -i audio.wav -i movie.m2v -target pal-dvd -acodec pcm_s16be -b 8000k -s 720x576 -ab 1536k -ac 2 -r 25 movie.mpg , getting the following error message: [...] [dvd @ 0x8311670]buffer underflow i=1 bufi=4026 size=4096te= 344.9kbits/s [dvd @ 0x8311670]packet too large, ignoring buffer limits to mux it [...] . Then I did: $ cat movie.mpg second-movie.vob > total-movie.mpg , but a terrible noise is heard when second-movie.vob begins. About second-movie.vob, ffmpeg gives the following information: Input #0, mpeg, from 'second-movie.vob': Duration: N/A, start: 556.163678, bitrate: N/A Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 8000 kb/s, 25.00 tb(r) Stream #0.1[0xa0]: Audio: pcm_s16be, 48000 Hz, stereo, s16, 1536 kb/s . Is it possible to achieve what I want? If not with mencoder, can you point out other tools/solutions? Thanks for any help Rodolfo

1 0