February 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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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

Linux VP6 2 pass still not working?
by root 26 Mar '09

26 Mar '09

Hi there, I am still having problem to do the 2nd pass encoding by using the latest SVN checkout. It seems the first pass log file neven been created under /tmp. Do I still need patch the win32.c file? BTW, no where to find the xx_vp6vfw_2pass_linux.diff file. Please help. Thanks.

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Aspect ratio change during MPEG-TS not detected (bug?)
by Ruud van der Linden / FluxxNet.nl 01 Mar '09

01 Mar '09

Hi, I'm working on a system that records an MPEG-TS stream (MPEG2) directly from DVB-T, and uses mencoder to transcode it directly to MPEG4/H.264. They seem to totally ignore any change and only use the first aspect ratio found in the stream (if the stream starts at 4:3, it will maintain that ratio always). Options like dsize,aspect,scale,autoaspect all seem to have no effect on the way mencoder handles the mid-stream change. However, I'm running into one problem: mencoder or its filters do not handle aspect ratio changes correctly (mplayer and vlc do). I would like to have one of the following results in output-file: 1) an mp4 (h264) file which contains the same aspect ratio change instructions as the original mpeg-ts, if that is possible (don't know for sure) 2) a permanent 4:3-aspect file (e.g. 768x576) which letterboxes the 16:9 content You can find a sample movie at this location (the beginning is corrupted as it is a dd'ed part from the file): http://213.193.236.16/shorttest.ts When starting the transcode, it mentions: Movie-Aspect is 1.33:1 - prescaling to correct movie aspect. Halfway (at the aspect ratio change) it mentions: VDec: vo config request - 704 x 576 (preferred colorspace: Planar YV12)9:160] VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. But I don't see it actually prescaling at all. By the way, this was tested with the current svn version of mencoder as well as with older versions, all show the same behaviour. I hope someone can come up with a fix for this bug. Thanks in advance for responding! With kind regards, Ruud van der Linden

2 1

newbie question to convert video and make them enabled on ps3
by Mathias 28 Feb '09

28 Feb '09

Hello everybody, I'm desespareted to find a way to convert my movies and make them enable on the playstation 3 player. My problem is the following one: I play my movies to my ps3 from a uPnP server. But I need to add some subtitles and my uPnP server doesn't had them on the fly; so I would like to convert them back in a ps3 supported format and include subtitles. So I have understand that playstation 3 doesn't accept all movies encoding, but only the following one: http://manuals.playstation.net/document/en/ps3/current/video/filetypes.html I've look for many way and search google for many hours to found a valid solution for that (avidemux, mencoder, ffmpeg, etc, etc) but mencoder for me is fine because it can be called from command line. But anyway, I can't play my movies on my ps3: each time I have "incompatibles datas" or "datas corrupted" messages when I try to loading a movie reencoded with all theses methods. I've tried this solution too http://lists.mplayerhq.hu/pipermail/mencoder-users/2009-February/009899.html by adding a profile in my ~/.mplayer/mencoder.conf file: subfont-autoscale=3 subpos=96 utf8=no subfont-osd-scale=6 subfont-text-scale=3 #xvidencopts=bitrate=1200:pass=1 #lavcopts=vcodec=mpeg4:vbitrate=1200 o=output.avi [for-ps3] profile-desc="conversion videos pour ps3" ovc=x264=1 oac=lavc=1 global_header=1 #ffourcc=mpeg4 x264encopts=subq=6:pass=1:bitrate=1200:bframes=3:partitions=p8x8,b8x8,i4x4:weight_b:threads=auto:nopsnr:nossim:frameref=3:mixed_refs:bime:brdo:level_idc=41: I made my movies with the following command line: mencoder -profile for-ps3 -sub "Lost S5E7.srt" -o "Lost S5E7.avi" "Lost S5E7VO.avi" My file is well generated and can be read on my ubuntu 8.10, but not available from my uPnP server: MEncoder 2:1.0~rc2-0ubuntu17 (C) 2000-2007 MPlayer Team CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 6000+ (Family: 15, Model: 107, Stepping: 2) CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. Warning unknown option global_header at line 21 success: format: 0 data: 0x0 - 0x15f0f342 AVI file format detected. [aviheader] Video stream found, -vid 0 [aviheader] Audio stream found, -aid 1 VIDEO: [XVID] 624x352 24bpp 23.976 fps 955.9 kbps (116.7 kbyte/s) [V] filefmt:3 fourcc:0x44495658 size:624x352 fps:23.98 ftime:=0.0417 ========================================================================== Opening audio decoder: [mp3lib] MPEG layer-2, layer-3 AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000) Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3) ========================================================================== SUB: Detected subtitle file format: subviewer SUB: Read 456 subtitles. 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: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4) ========================================================================== VDec: vo config request - 624 x 352 (preferred colorspace: Planar YV12) VDec: using Planar I420 as output csp (no 1) Movie-Aspect is 1.77:1 - prescaling to correct movie aspect. x264 [info]: using SAR=1/1 x264 [info]: using cpu capabilities: MMX MMXEXT SSE SSE2 SSE3 3DNow! Pos: 0.0s 1f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0] 1 duplicate frame(s)! Writing header... ODML: vprp aspect is 16384:9242. Setting audio delay to 0.048s. Writing header... ODML: vprp aspect is 16384:9242. Setting audio delay to 0.048s. Writing header...6f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.019 [0:0] ODML: vprp aspect is 16384:9242. Setting audio delay to 0.048s. Pos:2702.5s 64800f (100%) 32.77fps Trem: 0min 451mb A-V:0.038 [1182:224] Flushing video frames. Writing index... Writing header... ODML: vprp aspect is 16384:9242. Setting audio delay to 0.048s. Video stream: 1182.417 kbit/s (147802 B/s) size: 399464757 bytes 2702.700 secs 64800 frames Audio stream: 224.000 kbit/s (28000 B/s) size: 75675936 bytes 2702.712 secs x264 [info]: slice I:638 Avg QP:14.52 size: 24780 x264 [info]: slice P:23624 Avg QP:15.72 size: 11055 x264 [info]: slice B:40537 Avg QP:17.07 size: 3022 x264 [info]: mb I I16..4: 35.4% 0.0% 64.6% x264 [info]: mb P I16..4: 10.5% 0.0% 12.6% P16..4: 38.9% 22.7% 9.6% 0.0% 0.0% skip: 5.7% x264 [info]: mb B I16..4: 0.7% 0.0% 0.8% B16..8: 36.5% 3.2% 5.5% direct: 8.6% skip:44.6% x264 [info]: final ratefactor: 15.51 x264 [info]: direct mvs spatial:99.2% temporal:0.8% x264 [info]: ref P 85.2% 9.8% 5.0% x264 [info]: ref B 93.7% 6.3% x264 [info]: kb/s:1182.4 Could you confirm me that I'm right with the following cases: - ps3 allow H.264/MPEG-4 AVC High Profile （AAC LC）. When I try to encode it with ovc=x264 et oac=lavc I'm right? (I'm newbie with video processing) - is it the better way, the more compatible way with theses codecs? - does movie this can have a influence in my problems? - if I run mencoder -profile for-ps3 -sub "Lost S5E7.srt" -o "Lost S5E7.mp4" "Lost S5E7VO.avi" will make the same result? (container is not store in extension?) - I have read many feedback of people which have the same problem than mine, but their solutions doesn't help me. I suppose that source movie cannot be responsible because it'll be reencoded from uncompressed movie? Sometimes, it's works for them. not me. Does subtitle can be responsible of that? - Does anyone of you have a complete profile to help me to convert my file? I've tried global_header, output codecs, bitrate, level_idc, parameters but none help me. What is your feedback? Best regards, Mat PS: please accept my apologies for my english

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Mencoder segfault with output video form ggrab
by Alexander Stockinger 28 Feb '09

28 Feb '09

Hi all, I stumbled upon a video file that lets mencoder segfault during transcoding. The file is a TS stream from a digital tv receiver captured with ggrab. Other captured streams worked perfectly nice before, this one however reproducably shows this behaviour. I use the current default version from Debian Etch. Here is Mencoder's output (along with the command line I use at the end): MEncoder dev-SVN-r26940 (C) 2000-2008 MPlayer Team CPU: Intel Pentium III Katmai/Pentium III Xeon Tanner (Family: 6, Model: 7, Stepping: 3) CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0 Compiled with runtime CPU detection. success: format: 0 data: 0x0 - 0x65b5800 MPEG-PS file format detected. VIDEO: MPEG2 720x576 (aspect 3) 25.000 fps 10000.0 kbps (1250.0 kbyte/s) [V] filefmt:2 fourcc:0x10000002 size:720x576 fps:25.000 ftime:=0.0400 ========================================================================== Opening audio decoder: [mp3lib] MPEG layer-2, layer-3 AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000) Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3) ========================================================================== xvid: using library version 1.1.3 (build xvid-1.1.3) Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1 Opening video filter: [scale w=800 h=450] ========================================================================== Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo config request - 720 x 576 (preferred colorspace: Mpeg PES) 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) ========================================================================== MP3 audio selected. VDec: vo config request - 720 x 576 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. SwScaler: reducing / aligning filtersize 5 -> 4 SwScaler: reducing / aligning filtersize 5 -> 4 SwScaler: reducing / aligning filtersize 7 -> 6 SwScaler: reducing / aligning filtersize 7 -> 6 [swscaler @ 0x86b0cf8]BICUBIC scaler, from yuv420p to yuv420p using MMX2 [swscaler @ 0x86b0cf8]using 4-tap MMX scaler for horizontal luminance scaling [swscaler @ 0x86b0cf8]using 4-tap MMX scaler for horizontal chrominance scaling [swscaler @ 0x86b0cf8]using n-tap MMX scaler for vertical scaling (YV12 like) [swscaler @ 0x86b0cf8]720x576 -> 800x450 videocodec: XviD (800x450 fourcc=44495658 [XVID]) xvid: par=0/0 (vga11), displayed=800x450, sampled=800x450 xvid: CBR Rate Control -- bitrate=1200kbit/s Pos: 0.0s 1f ( 0%) 0.00fps Trem: 1min 0mb A-V:0.000 [0:0] Pos: 0.0s 2f ( 0%) 0.00fps Trem: 1min 0mb A-V:0.004 [0:0] 1 duplicate frame(s)! Writing header... ODML: vprp aspect is 16:9. Setting audio delay to 0.048s. Writing header... ODML: vprp aspect is 16:9. Setting audio delay to 0.048s. Pos: 0.0s 3f ( 0%) 0.00fps Trem: 1min 4mb A-V:0.008 [0:0] 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. Writing header... ODML: vprp aspect is 16:9. Setting audio delay to 0.048s. 1 duplicate frame(s)! Pos: 0.1s 4f ( 0%) 0.00fps Trem: 2min 8mb A-V:0.012 [0:0] Pos: 0.1s 5f ( 0%) 0.00fps Trem: 2min 8mb A-V:0.016 [0:0] Pos: 0.2s 6f ( 0%) 4.49fps Trem: 4min 11mb A-V:0.020 [0:0] Pos: 0.2s 7f ( 0%) 4.01fps Trem: 5min 11mb A-V:0.024 [0:0] Pos: 0.2s 8f ( 0%) 3.51fps Trem: 7min 14mb A-V:0.028 [0:0] Pos: 0.3s 9f ( 0%) 3.18fps Trem: 9min 17mb A-V:0.032 [0:0] Pos: 0.3s 10f ( 0%) 3.06fps Trem: 10min 19mb A-V:0.036 [0:0] Pos: 0.4s 11f ( 0%) 2.94fps Trem: 11min 20mb A-V:0.040 [0:0] Pos: 0.4s 12f ( 0%) 2.93fps Trem: 13min 21mb A-V:0.044 [0:0] Pos: 0.4s 13f ( 0%) 2.87fps Trem: 14min 22mb A-V:0.048 [0:0] Pos: 0.5s 14f ( 0%) 2.84fps Trem: 15min 23mb A-V:0.052 [0:0] Pos: 0.5s 15f ( 0%) 2.99fps Trem: 14min 21mb A-V:0.056 [0:0] Pos: 0.5s 16f ( 0%) 2.96fps Trem: 15min 22mb A-V:0.060 [0:0] Pos: 0.6s 17f ( 0%) 2.94fps Trem: 16min 22mb A-V:0.064 [0:191] Pos: 0.6s 18f ( 0%) 2.93fps Trem: 14min 19mb A-V:0.068 [0:191] Pos: 0.6s 19f ( 0%) 2.86fps Trem: 16min 21mb A-V:0.072 [0:191] Pos: 0.7s 20f ( 0%) 2.85fps Trem: 16min 21mb A-V:0.076 [0:192] Pos: 0.7s 21f ( 0%) 2.86fps Trem: 17min 21mb A-V:0.080 [0:192] Pos: 0.8s 22f ( 0%) 2.81fps Trem: 18min 23mb A-V:0.084 [0:192] Skipping frame! Pos: 0.8s 23f ( 0%) 2.94fps Trem: 18min 23mb A-V:0.048 [0:191] Pos: 0.8s 24f ( 0%) 2.93fps Trem: 19min 23mb A-V:0.052 [0:191] Pos: 0.8s 25f ( 0%) 2.93fps Trem: 20min 23mb A-V:0.056 [0:191] Pos: 0.9s 26f ( 0%) 2.91fps Trem: 21min 24mb A-V:0.060 [0:191] Pos: 0.9s 27f ( 0%) 2.90fps Trem: 22min 25mb A-V:0.064 [0:192] Pos: 1.0s 28f ( 0%) 2.89fps Trem: 23min 26mb A-V:0.068 [0:192] Pos: 1.0s 29f ( 0%) 2.85fps Trem: 24min 27mb A-V:0.072 [0:192] Pos: 1.0s 30f ( 0%) 2.83fps Trem: 21min 24mb A-V:0.076 [1280:191] Pos: 1.1s 31f ( 0%) 2.83fps Trem: 21min 24mb A-V:0.080 [1254:191] Pos: 1.1s 32f ( 0%) 2.78fps Trem: 22min 26mb A-V:0.084 [1339:191] Skipping frame! Pos: 1.1s 33f ( 0%) 2.86fps Trem: 22min 26mb A-V:0.048 [1339:192] Pos: 1.2s 34f ( 0%) 2.85fps Trem: 23min 26mb A-V:0.052 [1322:192] Pos: 1.2s 35f ( 0%) 2.82fps Trem: 24min 28mb A-V:0.056 [1362:192] Pos: 1.2s 36f ( 0%) 2.82fps Trem: 25min 29mb A-V:0.060 [1350:192] Pos: 1.3s 37f ( 0%) 2.80fps Trem: 25min 30mb A-V:0.064 [1367:191] Pos: 1.3s 38f ( 0%) 2.83fps Trem: 26min 32mb A-V:0.068 [1436:191] Pos: 1.4s 39f ( 0%) 2.81fps Trem: 27min 33mb A-V:0.072 [1444:191] Pos: 1.4s 40f ( 0%) 2.80fps Trem: 27min 33mb A-V:0.076 [1416:191] Pos: 1.4s 41f ( 0%) 2.80fps Trem: 27min 32mb A-V:0.080 [1390:192] Pos: 1.5s 42f ( 0%) 2.79fps Trem: 28min 33mb A-V:0.084 [1389:192] Skipping frame! Pos: 1.5s 43f ( 0%) 2.84fps Trem: 25min 30mb A-V:0.048 [1389:192] Pos: 1.5s 44f ( 0%) 2.84fps Trem: 26min 30mb A-V:0.052 [1363:192] Pos: 1.6s 45f ( 0%) 2.84fps Trem: 26min 30mb A-V:0.056 [1339:191] Pos: 1.6s 46f ( 1%) 2.82fps Trem: 25min 29mb A-V:0.060 [1344:191] Pos: 1.6s 47f ( 1%) 2.82fps Trem: 26min 29mb A-V:0.064 [1325:191] Pos: 1.7s 48f ( 1%) 2.82fps Trem: 26min 29mb A-V:0.068 [1305:191] Pos: 1.7s 49f ( 1%) 2.80fps Trem: 27min 30mb A-V:0.072 [1319:191] Pos: 1.8s 50f ( 1%) 2.80fps Trem: 27min 31mb A-V:0.076 [1302:191] Pos: 1.8s 51f ( 1%) 2.79fps Trem: 28min 31mb A-V:0.080 [1288:192] Pos: 1.8s 52f ( 1%) 2.76fps Trem: 29min 32mb A-V:0.084 [1301:192] Skipping frame! Pos: 1.8s 53f ( 1%) 2.82fps Trem: 29min 32mb A-V:0.048 [1301:192] Pos: 1.9s 54f ( 1%) 2.82fps Trem: 29min 32mb A-V:0.052 [1285:192] Pos: 1.9s 55f ( 1%) 2.82fps Trem: 29min 31mb A-V:0.056 [1270:192] Pos: 2.0s 56f ( 1%) 2.80fps Trem: 29min 32mb A-V:0.060 [1285:192] Pos: 2.0s 57f ( 1%) 2.79fps Trem: 30min 32mb A-V:0.064 [1273:192] Pos: 2.0s 58f ( 1%) 2.80fps Trem: 28min 30mb A-V:0.068 [1259:191] Pos: 2.1s 59f ( 1%) 2.78fps Trem: 28min 31mb A-V:0.072 [1275:191] Pos: 2.1s 60f ( 1%) 2.78fps Trem: 27min 29mb A-V:0.076 [1263:191] Pos: 2.2s 61f ( 1%) 2.78fps Trem: 27min 29mb A-V:0.080 [1254:191] Pos: 2.2s 62f ( 1%) 2.76fps Trem: 27min 29mb A-V:0.084 [1279:191] Skipping frame! Pos: 2.2s 63f ( 1%) 2.80fps Trem: 27min 30mb A-V:0.048 [1279:191] Pos: 2.2s 64f ( 1%) 2.80fps Trem: 28min 30mb A-V:0.052 [1269:191] Pos: 2.3s 65f ( 1%) 2.80fps Trem: 28min 30mb A-V:0.056 [1262:192] ./test.sh: line 3: 3505 Segmentation fault /usr/bin/mencoder /fileserv/Movies/recorder/process/fname.vob -oac mp3lame -lameopts cbr:br=192 -ovc xvid -xvidencopts bitrate=1200 -vf scale=800:450 -o /fileserv/Movies/recorder/target/fname.avi Does anyone have an idea how to prevent this from happening? If required, I can also provide the source video - it is however ~100MB. Thanks for your help, Alex

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a/v desync when encoding combined 24000/1001 30000/1 fps NTSC DVD
by Sergey Kovalev 27 Feb '09

27 Feb '09

I would like to encode several iso-dvds to something smaller. ISO in question is attached as /dev/md0 on my freebsd box. While playing it I sometimes get messages at fixed points $ mplayer dvd://1 MPlayer 1.0rc2-4.2.1 (C) 2000-2007 MPlayer Team CPU: AMD Athlon(tm) XP 2500+ (Family: 6, Model: 10, Stepping: 0) CPUflags: MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0 Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE A: 182.9 V: 182.9 A-V: -0.000 ct: 0.054 5475/5472 4% 0% 1.7% 6 0 demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate A: 201.9 V: 201.9 A-V: 0.022 ct: 0.080 5931/5928 4% 0% 1.8% 6 0 demux_mpg: 30000/1001fps NTSC content detected, switching framerate. Warning! FPS changed 23.976 -> 29.970 (-5.994005) [4] 0% 1.8% 6 0 A: 286.8 V: 286.8 A-V: 0.004 ct: 0.138 8476/8470 6% 0% 2.5% 6 0 demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate etc. So I've decided that I have "11.2.3.4. Mixed progressive and telecine" according to documentation. The problem arises when I try to encode audio. When I copy with -oac copy everything is fine, 448 kbit/s ac3 stream is preserved. But when I encode audio reducing abitrate, I do two-pass encoding with a shell script: mencoder dvd://1 -chapter 3-3 -aid 129 \ -ofps 24000/1001 -oac lavc -o $fname -ovc lavc -lavcopts \ vcodec=mpeg4:vbitrate=1152:mbd=2:trell:v4mv:autoaspect:vpass=$i \ -vf pullup,softskip,crop=656:352:32:64 where $fname and $i are shell variables with corresponding values. The resulting avi shows enormous a/v desync: A:15869.7 V: 25.9 A-V:15843.711 ct: 2.590 622/622 5% 1% 0.6% 0 0 if I understand A:, V: and A-V: numbers correctly. Seeking on audio stream is almost impossible. And forward seeking often leads to warnings: Badly interleaved AVI file detected - switching to -ni mode... Besides ct: value is always growing. That leads to the actual desync which can only be avoided by using -mc 0 while playing. I've already tried "-vf filmdint", "-mc 0" "-*idx", but the results were almost the same. Does anybody know why is this happening? I suppose I don't understand something important here.

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Mencoder Subtitles not working
by James Hastings-Trew 26 Feb '09

26 Feb '09

Hopefully this doesn't appear to be hijacking a thread... I'm trying to burn subtitles into a video with mencoder. I know that this has worked in the past, but doesn't seem to work anymore. This works to play back the raw video with subtitles; mplayer video.h264 -sws 9 -vf scale=1280:720 -sub subtitles.srt -utf8 -subfont-autoscale 0 -subfont-text-scale 35 -subpos 98 This does not work to encode the same subtitles into a file: mencoder video.h264 -sws 9 -vf scale=1280:720 -sub subtitles.srt -utf8 -subfont-autoscale 0 -subfont-text-scale 35 -subpos 98 -ovc lavc -o test.avi There is no error message that something failed. The resulting video just has no subtitles in it. Is something broken that shouldn't be? I looked around the list and found a few others asking similar questions, with no answers given. Thought I'd give it a shot. Here is mencoder's output: MEncoder Sherpya-SVN-r28311-4.2.5 (C) 2000-2009 MPlayer Team CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ (Family: 15, Model: 43, Step ping: 1) SSE supported but disabled SSE2 supported but disabled CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 0 SSE2: 0 Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx success: format: 0 data: 0x0 - 0xf0816a00 libavformat file format detected. [lavf] Video stream found, -vid 0 VIDEO: [H264] 1920x1080 0bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s) [V] filefmt:35 fourcc:0x34363248 size:1920x1080 fps:23.976 ftime:=0.0417 Opening video filter: [expand osd=1] Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1 Opening video filter: [scale w=1280 h=720] SUB: Detected subtitle file format: subviewer SUB: Read 806 subtitles. SUB: Adjusted 1 subtitle(s). ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264) ========================================================================== VDec: vo config request - 1920 x 1080 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. SwScaler: reducing / aligning filtersize 10 -> 12 SwScaler: reducing / aligning filtersize 10 -> 12 SwScaler: reducing / aligning filtersize 10 -> 9 SwScaler: reducing / aligning filtersize 10 -> 9 [swscaler @ 01E9C020]Lanczos scaler, from yuv420p to yuv420p using MMX2 [swscaler @ 01E9C020]using n-tap MMX scaler for horizontal luminance scaling [swscaler @ 01E9C020]using n-tap MMX scaler for horizontal chrominance scaling [swscaler @ 01E9C020]using n-tap MMX scaler for vertical scaling (YV12 like) [swscaler @ 01E9C020]1920x1080 -> 1280x720 videocodec: libavcodec (1280x720 fourcc=34504d46 [FMP4])

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