March 2011 - MEncoder-users - lists.mplayerhq.hu

27 Apr '13

Hi, I wanted to combine 12 flash video files (from youtube) into a single avi file. So I did cat at Zachar*.flv > Zach_all.flv $ mencoder Zach_all.flv -o Zach_all.avi -forceidx -ovc copy -oac pcm The output shows skipping frames, and missing aspect information, as you see below. What do I need to do to fix that, so thet when I am transcoding into .avi, I do not get these skips and missing aspect info? MEncoder SVN-r31628-4.4.5 (C) 2000-2010 MPlayer Team success: format: 0 data: 0x0 - 0x8378f0a libavformat file format detected. [flv @ 0x92d07a0] Estimating duration from bitrate, this may be inaccurate [lavf] stream 0: video (h264), -vid 0 [lavf] stream 1: audio (aac), -aid 0 VIDEO: [H264] 480x270 0bpp 29.917 fps 119.2 kbps (14.5 kbyte/s) [V] filefmt:44 fourcc:0x34363248 size:480x270 fps:29.917 ftime:=0.0334 ========================================================================== Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding) AUDIO: 44100 Hz, 2 ch, s16le, 49.5 kbit/3.51% (ratio: 6184->176400) Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio)) ========================================================================== videocodec: framecopy (480x270 0bpp fourcc=34363248) Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Writing header... ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. Pos: 0.7s 21f ( 0%) 14.38fps Trem: 0min 0mb A-V:0.067 [0:1411] Skipping frame! Pos: 1.1s 33f ( 0%) 18.45fps Trem: 0min 0mb A-V:0.068 [150:1411] Skipping frame! Pos: 6.0s 182f ( 0%) 38.81fps Trem: 65min 1014mb A-V:0.067 [148:1411] Skipping frame! Pos: 23.5s 706f ( 0%) 43.90fps Trem: 70min 1142mb A-V:0.067 [106:1411] Skipping frame! Pos: 38.4s 1153f ( 0%) 44.83fps Trem: 68min 1147mb A-V:0.067 [113:1411] Skipping frame! Pos: 57.4s 1723f ( 0%) 44.84fps Trem: 66min 1117mb A-V:0.068 [124:1411] Skipping frame! Pos: 76.9s 2306f ( 1%) 44.36fps Trem: 65min 1089mb A-V:0.067 [128:1411] Skipping frame! Pos: 98.4s 2950f ( 1%) 44.17fps Trem: 65min 1092mb A-V:0.067 [126:1411] Skipping frame! Pos: 117.5s 3522f ( 1%) 43.68fps Trem: 65min 1086mb A-V:0.067 [128:1411] Skipping frame! Pos: 132.5s 3972f ( 2%) 43.76fps Trem: 66min 1092mb A-V:0.067 [127:1411] Skipping frame! Pos: 153.7s 4608f ( 2%) 44.14fps Trem: 66min 1104mb A-V:0.067 [126:1411] Skipping frame! Pos: 173.1s 5190f ( 2%) 43.84fps Trem: 68min 1133mb A-V:0.067 [120:1411] Skipping frame! Pos: 190.3s 5705f ( 3%) 44.08fps Trem: 67min 1122mb A-V:0.067 [121:1411] Skipping frame! Pos: 211.7s 6347f ( 3%) 43.80fps Trem: 66min 1114mb A-V:0.068 [124:1411] Skipping frame! Pos: 228.7s 6856f ( 3%) 43.84fps Trem: 66min 1113mb A-V:0.067 [124:1411] Skipping frame! Pos: 248.1s 7436f ( 4%) 44.06fps Trem: 65min 1110mb A-V:0.067 [125:1411] Skipping frame! Pos: 265.3s 7954f ( 4%) 43.82fps Trem: 66min 1120mb A-V:0.067 [123:1411] Skipping frame!

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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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Problem with ac3 encoding: 1 duplicate frame(s)!
by Bernd Butscheidt 30 Apr '11

30 Apr '11

I am doing this: mencoder -noskip -ovc x264 -speed 24000/25000 -ofps 24 -vf hqdn3d,softskip,harddup -x264encopts subq=1:frameref=3:me=hex:bframes=3:b_adapt:threads=auto:8x8dct:crf=12:b_pyramid=normal:weightp=2:keyint=250:weight_b:vbv_maxrate=40000:vbv_bufsize=30000:level_idc=41 -channels 6 -srate 48000 -oac lavc -af lavcresample=48000 -lavcopts acodec=ac3:abitrate=448 -alang en,de -slang en,de -vobsubout Lucky#Number#Slevin#3 dvd://3 -dvd-device /dev/sr0 -of lavf -lavfopts format=matroska -o Lucky#Number#Slevin#3€reenc.mkv -aid 129 Using MEncoder SVN-r33074-4.5.2 I get endlessly "1 duplicate frame(s)!"-messages, about every 0.5s. Actually I stopped at about Position 30 seconds. If I use "-lameopts cbr:br=224:aq=0:mode=1" instead of ac3-Audio or(!) switch back to MEncoder SVN-r32719-4.5.2 using the same source and calling the exactly the same options as above (including ac3-Audio!!!) I get 3 "Skipping frame!"-messages until position 2.9seconds (using the older version) or 4"Skipping frame!"-messages until position 2.3 seconds using the new version but sticking to mp3-sound. The encoding continues without problems (tested so far until 3% of the whole movie). Although I don't know why mencoder skips frames at the beginning, this is the behaviour I am used too and which leads to very satisfying results. So do newer versions of mencoder break ac3-encoding or does my simple mind misses something again .... Kind regards Bernd B.

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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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Framerate advice
by larrystotler＠netscape.net 01 Apr '11

01 Apr '11

I've been reviewing some technical info on framerates on NTSC Video. Due to a lot of framerate changes in videos, I've been using -fps 120000/1001 to get the 29.97fps rate for standard TVs. However, having seen a lot of the "telecine jitter" caused by the 3:2 pulldown process, I have some questions. Most films are 24fps. I watch almost everything on a computer or laptop, so I'm wondering if it's worth keeping Movies at 30fps(which would be good only if I actually used a TV) and instead keeping them at 24fps. TV shows are recoreded at 30fps anyway, so that's not an issue. Also, what about using an ATSC TV for HD at 480p? Would newer standards work better with 24fps? Any comments? Thanx

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Extracting row video for x264 encoding
by Julien Palard 30 Mar '11

30 Mar '11

Hi there ! I'm trying to encode some videos using this way : Extract raw audio, use faac to encode Extract raw video, use x264 to encode box them together as mp4. I'm using mplayer and faac for the audio, it works :) I'm using mencoder and x264 for video : I got problems with framrates : videos outputs are randomly (depending of the input) [normal | a bit fast | 2x too fast] My current try is : mencoder source_file dsize=650:366:0,scale=0:0,expand=650:366,dsize=1.5,format=i420 -nosound -ovc raw -of rawvideo -ofps 25 video.yuv then x264 video.yuv -o --fps 25 --profile baseline --level 3 --no-fast-pskip --vbv-maxrate 512 --vbv-bufsize 512 --partitions all --no-cabac --me tesa --subme 10 --input-res 650x366 video.h264 I want to force ~25 FPS on output, I don't need more ... but i got this a/v desync. Any idea ?

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Any recent changes that could affect MPEG 2 muxing?
by L. Lee 26 Mar '11

26 Mar '11

If I execute a mux command to adjust A/V sync in an MPEG 2 stream such as mencoder [inputfile.mpg] -ovc copy -oac copy -ofps 24000/1001 -of mpeg -mpegopts format=dvd:tsaf:adelay=-200:muxrate=40000 -o [outputfile.mpg] using MEncoder svn r32924 (as well as quite a few previous versions), everything works well. If, however, I execute that command using r33094, the audio tempo appears to be increased greatly, demolishing sync, and the command progress output includes many duplicate frame notifications. The visual output remains unaffected. Has something changed that can be accommodated by adjusting any of the above command options? The source video is 24 fps with 6-channel audio (AC3). Thanks. Laine Lee

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grabbing a single frame
by Steven Miller 25 Mar '11

25 Mar '11

Is it possible to grab and save a single frame, be it an I or P or B frame? I want the single frame. Not what the decoder would show you. I'm trying to get a feel for how each frame type looks. I'm using mencoder/libx264. Let me know if I haven't described what I'm after well enough. thanks, Steve

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Faac v. NeroAccEnc
by Steven Miller 23 Mar '11

23 Mar '11

Perhaps this isn't the correct forum, but here goes. Anyone who's had experience using both, have an opinon on which is better? The reason I asked is I read a blurb that said faac development has been slowing down alot. I've used both and found neroAacEnc does a better job. Although mencoder refuses to mux it into an .avi with video demuxed from an mencoder encode.  Thanks, Steve -- Sent from my Palm Pixi

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Problems building mplayer - crystalhd errors
by L. Lee 21 Mar '11

21 Mar '11

On 3/10/11 10:05 PM, "Laine Lee" <llee040(a)sbcglobal.net> wrote: > I successfully built latest mplayer svn about a month ago. Now I'm getting > errors that appear to be related to some provision for CrystalHD. I'm > building with ffmpeg support. Is there something I can disable for mplayer > or ffmpeg configuration that would prevent errors like these? > > Undefined symbols: > "_ff_mpeg4_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > "_ff_msmpeg4_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > "_ff_mpeg2_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > "_ff_vc1_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > "_ff_wmv3_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > "_ff_h264_crystalhd_decoder", referenced from: > _avcodec_register_all in libavcodec.a(allcodecs.o) > > Thanks. > > Laine Lee Nevermind, I took a stab at adding "--disable-decoder=crystalhd" to the mplayer configure options and was able to compile successfully. Thanks. Laine Lee

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