January 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

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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!

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divx 2 mpeg2
by philippe monroux 03 Feb '09

03 Feb '09

Hello all A friend of mine has a 25 min long divx video (for instance he don't know the audio codec). He want I transcode this video in such a way he can play it with the largest range dvd player (even old one). What video codec can I use ? mpeg2 ? If mpeg 2 is the best choice, is divx-->mpeg2 supported by mencoder ? And which container can I use (perhaps it depends of the audio codec) ? Thank you very much -- Philippe Monroux E 55.3 S 21.5 http://zygomaths.pagespro-orange.fr/index.html

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problem watching mpeg2 on DVD
by Mehturt 01 Feb '09

01 Feb '09

Hello list, I have problem creating a DVD off of my camcoder. What I do is I capture to .avi files from the camcoder (via kino) and then I do the conversion to mpeg2 and simple authoring (via devede). Devede uses mencoder to convert the avi files to mpeg2. The command line used is approximately this one: mencoder -srate 48000 -af lavcresample=48000 -oac lavc \ -aid 1 -ovc lavc -of mpeg -mpegopts format=dvd:tsaf \ -ofps 25 -vf expand=720:590:0:8,scale=720:576,harddup \ -lavcopts \ threads=2:vcodec=mpeg2video:trell:mbd=2:sc_threshold=1000000000:cgop:vstrict=0:vrc_maxrate=8500:vrc_buf_size=1835:vbitrate=5001:keyint=12:acodec=ac3:abitrate=224:aspect=4/3 \ -o $f.mpg $f Both .avi and the resulting .mpeg plays fine in mplayer. However when I create the DVD and use the DVD player to play it, the movie is distorted. Don't know exactly how to describe it, but when the camera moves, the image is not moving smoothly, but jerkily. Did anybody else experience this problem? Thanks for any ideas on how to fix this. m.

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Mencoder playlist with subtitles (was display filename)
by Patrick 30 Jan '09

30 Jan '09

Hi Everyone Thanks to Peter's suggestion I wrote a Python script to automatically create subtitle files. With Mplayer's playlist feature the subtitle file will automatically load with the video, everything works perfectly. Mencoder does not seem to have a playlist option and when I wrote the following bash script only the first subtitle file was encoded: mencoder -ovc lavc -vf scale=300:300 -ofps 20 \ abbreviate.swf -sub abbreviate.srt \ abc_s.swf -sub abc_s.srt -o mencoder.mpeg I have about 5K .swf files and 5k .srt files I would like to encode into one video is there someway for me to do this? Thanks for reading-Patrick

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Floating point exception
by double 28 Jan '09

28 Jan '09

Hi, Mencoder crashes, if I try to convert a small flv-file (~600k) to an mp3-avi. Command line to reproduce the error: mencoder -ovc copy -oac mp3lame -lameopts cbr:br=64 http://doppelbauer.name/error.flv -o test.avi Output below. Thanks Marcus MEncoder dev-SVN-r27896-4.2.4 (C) 2000-2008 MPlayer Team CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 3400+ (Family: 15, Model: 75, Stepping: 2) CPUflags: Type: 15 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[174.132.100.250]: 80... Cache size set to 320 KBytes success: format: 0 data: 0x0 - 0x9d7c4 libavformat file format detected. [lavf] Video stream found, -vid 0 [lavf] Audio stream found, -aid 1 VIDEO: [FLV1] 512x384 0bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s) [V] filefmt:44 fourcc:0x31564C46 size:512x384 fps:25.000 ftime:=0.0400 ========================================================================== Opening audio decoder: [mp3lib] MPEG layer-2, layer-3 AUDIO: 44100 Hz, 2 ch, s16le, 64.0 kbit/4.54% (ratio: 8000->176400) Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3) ========================================================================== videocodec: framecopy (512x384 0bpp fourcc=31564c46) MP3 audio selected. Pos: 0.0s 1f (100%) 0.00fps Trem: 0min 0mb A-V:0.000 [0:0] Pos: 0.1s 2f (100%) 0.00fps Trem: 0min 0mb A-V:0.004 [0:0] Pos: 0.1s 3f (100%) 0.00fps Trem: 0min 0mb A-V:0.008 [0:0] Pos: 0.2s 4f (100%) 0.00fps Trem: 0min 0mb A-V:0.012 [0:0] Pos: 0.2s 5f (100%) 0.00fps Trem: 0min 0mb A-V:0.016 [0:0] Pos: 0.2s 6f (100%) 0.00fps Trem: 0min 0mb A-V:0.020 [0:0] Pos: 0.3s 7f (100%) 0.00fps Trem: 0min 0mb A-V:0.024 [0:0] Pos: 0.3s 8f (100%) 0.00fps Trem: 0min 0mb A-V:0.028 [0:0] Pos: 0.4s 9f (100%) 8.83fps Trem: 0min 0mb A-V:0.032 [0:0] Pos: 0.4s 10f (100%) 8.94fps Trem: 0min 0mb A-V:0.036 [0:0] Pos: 0.4s 11f (100%) 9.02fps Trem: 0min 0mb A-V:0.040 [0:0] Pos: 0.5s 12f (100%) 9.10fps Trem: 0min 0mb A-V:0.044 [0:0] Pos: 0.5s 13f (100%) 9.15fps Trem: 0min 0mb A-V:0.048 [0:0] Pos: 0.6s 14f (100%) 9.21fps Trem: 0min 0mb A-V:0.052 [0:0] Pos: 0.6s 15f (100%) 9.26fps Trem: 0min 0mb A-V:0.056 [0:0] Pos: 0.6s 16f (100%) 9.30fps Trem: 0min 0mb A-V:0.060 [0:0] Pos: 0.7s 17f (100%) 9.34fps Trem: 0min 0mb A-V:0.064 [0:0] Pos: 0.7s 18f (100%) 9.37fps Trem: 0min 0mb A-V:0.068 [0:0] Pos: 0.8s 19f (100%) 9.40fps Trem: 0min 0mb A-V:0.072 [0:0] Pos: 0.8s 20f (100%) 9.43fps Trem: 0min 0mb A-V:0.076 [0:0] Pos: 0.8s 21f (100%) 9.46fps Trem: 0min 0mb A-V:0.080 [0:0] Pos: 0.9s 22f (100%) 9.52fps Trem: 0min 0mb A-V:0.084 [0:0] Skipping frame! Pos: 0.9s 23f (100%) 9.54fps Trem: 0min 0mb A-V:0.048 [0:0] Pos: 0.9s 24f (100%) 9.55fps Trem: 0min 0mb A-V:0.052 [0:0] Pos: 1.0s 25f (100%) 9.57fps Trem: 0min 0mb A-V:0.056 [0:0] Pos: 1.0s 26f (100%) 9.59fps Trem: 0min 0mb A-V:0.060 [0:0] Pos: 1.0s 27f (100%) 9.60fps Trem: 0min 0mb A-V:0.064 [3568:0] Pos: 1.1s 28f (100%) 9.62fps Trem: 0min 0mb A-V:0.068 [3526:0] Pos: 1.1s 29f (100%) 9.62fps Trem: 0min 0mb A-V:0.072 [3452:0] Pos: 1.2s 30f (100%) 9.64fps Trem: 0min 0mb A-V:0.075 [3364:0] Pos: 1.2s 31f (100%) 9.65fps Trem: 0min 0mb A-V:0.078 [3292:0] Pos: 1.2s 32f (100%) 9.66fps Trem: 0min 0mb A-V:0.080 [3273:0] Skipping frame! Pos: 1.2s 33f (100%) 9.67fps Trem: 0min 0mb A-V:0.043 [3273:0] Pos: 1.3s 34f (100%) 9.68fps Trem: 0min 0mb A-V:0.045 [3232:0] Pos: 1.3s 35f (100%) 9.68fps Trem: 0min 0mb A-V:0.047 [3173:0] Pos: 1.4s 36f (100%) 9.69fps Trem: 0min 0mb A-V:0.049 [3124:0] Pos: 1.4s 37f (100%) 9.70fps Trem: 0min 0mb A-V:0.050 [3063:0] Pos: 1.4s 38f (100%) 9.71fps Trem: 0min 0mb A-V:0.052 [3012:0] Pos: 1.5s 39f (100%) 9.71fps Trem: 0min 0mb A-V:0.053 [2971:0] Pos: 1.5s 40f (100%) 9.72fps Trem: 0min 0mb A-V:0.054 [2978:0] Pos: 1.6s 41f (100%) 9.73fps Trem: 0min 0mb A-V:0.055 [2942:0] Pos: 1.6s 42f (100%) 9.73fps Trem: 0min 0mb A-V:0.056 [2926:0] Pos: 1.6s 43f (100%) 9.74fps Trem: 0min 0mb A-V:0.057 [2892:0] Pos: 1.7s 44f (100%) 9.74fps Trem: 0min 0mb A-V:0.057 [2867:0] Pos: 1.7s 45f (100%) 9.75fps Trem: 0min 0mb A-V:0.058 [2844:0] Floating point exception

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record with mencoder
by mierda tuti 28 Jan '09

28 Jan '09

Hi, I would like to record tv signal and if it's possible encoding the signal at the sime time to reduce the file size ( for example 1h40mint = 700mb) Could you help to do it with mencoder? Many thanks and sorry for my english!

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OCD formatting of DVDs for iPhone
by Peter Sebastian Masny 25 Jan '09

25 Jan '09

Hi all, [[[[in short, take 16:9 input and make the video 480x270, then add black bars above and below to real resolution 480x320, with a 1:1 pixel ratio]]]] Longer: I got a command line that does a good job of converting a DVD folder into an MPEG4 for my iPhone. The only problem is the aspect ratio. The situation: 1. my movies are all 16:9 (1.77:1) 2. mencoder rarely accurately detects the original aspect ratio (I seem to get 2.37:1 all the time) 3. iPhone display is 480x320 (1.5:1) 4. quicktime and iPhone need 1:1 pixel sizes, but iPhone will resize the pixel ratio (that's the weird part) I can run dsize=480:270 and get a nice video, playable on my iPhone, but when played it gets stretched to fill the screen (480x320) This bothers my OCD tendencies. I've tried to force the iPhone to add black bars to the top and bottom by dsize=480:270,expand=480:320, but this makes SAR 32/27 and does not add real black bars. What's the correct incantation to in short, take 16:9 input and make the video 480x270, then add black bars above and below to 480x320, with a 1:1 pixel ratio? Thanks in advance, Peter Output: > $ mencoder dvd://1 -dvd-device ANOMALY/ -o ANOMALY.mp4 -of lavf > -lavfopts format=mp4 \ > > -vf pp=ci,dsize=480:270,expand=480:320,harddup -sws 9 \ > > -ovc x264 -x264encopts > nocabac:level_idc=30:bframes=0:global_header:threads=auto:subq=5:frameref=6:partitions=all:trellis=1:chroma_me:me=umh:bitrate=512 > \ > > -oac faac -faacopts mpeg=4:object=2:raw:br=192 > MEncoder dev-SVN-r26940 (C) 2000-2008 MPlayer Team > CPU: Intel(R) Pentium(R) D CPU 2.80GHz (Family: 15, Model: 4, Stepping: 4) > CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 > Compiled with runtime CPU detection. > There are 53 titles on this DVD. > There are 1 angles in this DVD title. > audio stream: 0 format: ac3 (stereo) language: en aid: 128. > number of audio channels on disk: 1. > number of subtitles on disk: 0 > success: format: 2 data: 0x0 - 0xc69b0000 > MPEG-PS file format detected. > VIDEO: MPEG2 720x480 (aspect 3) 29.970 fps 6500.0 kbps (812.5 > kbyte/s) > [V] filefmt:2 fourcc:0x10000002 size:720x480 fps:29.970 ftime:=0.0334 > ========================================================================== > Opening audio decoder: [liba52] AC3 decoding with liba52 > Using SSE optimized IMDCT transform > Using MMX optimized resampler > AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000) > Selected audio codec: [a52] afm: liba52 (AC3-liba52) > ========================================================================== > ** 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: [harddup] > Opening video filter: [expand w=480 h=320] > Expand: 480 x 320, -1 ; -1, osd: 0, aspect: 0.000000, round: 1 > Opening video filter: [dsize=480:270] > Opening video filter: [pp=ci] > ========================================================================== > Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough > VDec: vo config request - 720 x 480 (preferred colorspace: Mpeg PES) > [PP] Using external postprocessing filter, max q = 6. > 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) > ========================================================================== > VDec: vo config request - 720 x 480 (preferred colorspace: Planar YV12) > [PP] Using external postprocessing filter, max q = 6. > VDec: using Planar I420 as output csp (no 1) > Movie-Aspect is 2.37:1 - prescaling to correct movie aspect. > x264 [info]: using SAR=32/27 > x264 [info]: using cpu capabilities: MMX2 SSE2 SSE3 Cache64 > [mpeg2video @ 0x86c6590]Warning MVs not available > [mpeg2video @ 0x86c6590]concealing 1036 DC, 1036 AC, 1036 MV errors > New_Face failed. Maybe the font path is wrong.n 0mb A-V:0.000 [0:0] > 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: 28f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.007 [0:0] > AUDIO CODEC ID: 15002, TAG: 0 > Writing header...

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