August 2010 - 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

Decoding h264
by double 25 Nov '10

25 Nov '10

Hi, "libavcodec" has problems with some h264 videos. Demuxing works, but not decoding. Is there a chance to use a native codec via the "-vc" switch? Testcase: mplayer http://doppelbauer.name/H264.mov Thanks a lot! Marcus

6 12

Encoding h264 mov 50 fps to flv - loosing of frames and seconds
by Raffaele Gambelli 13 Sep '10

13 Sep '10

Hi all, I'm quite a newbie of video editing and I would like to receive your opinion about my problem. My app internally makes use of mencoder to convert video of any formats to flv videos. My problem is that output video is less than original of 23 seconds, so the original is 3.53 and flv is 3.30 Here there are input video characteristics, and then my command line statement: Format : MPEG-4 Format profile : QuickTime Codec ID : qt File size : 91.0 MiB Duration :*3mn 53s * Overall bit rate : 3 269 Kbps Writing library : Apple QuickTime *Video* ID : 2 Format : *AVC* Format/Info : Advanced Video Codec Format profile : Main(a)L2.1 Format settings, CABAC : No Format settings, ReFrames : 2 frames Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 3mn 53s Bit rate mode : Variable Bit rate : 1 853 Kbps Width : 512 pixels Height : 288 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : *50.000 fps* Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits *Audio* ID : 1 Format : PCM Format settings, Endianness : Little Format settings, Sign : Signed Codec ID : sowt Duration : 3mn 53s Bit rate mode : Constant Bit rate : 1 411.2 Kbps Channel(s) : 2 channels Sampling rate : 44.1 KHz Bit depth : 16 bits Stream size : 39.3 MiB (43%) Language : English */usr/bin/mencoder* /test/test02_h264.mov -o /tmp/no_meta_lXYcUz_test02_h264.mov.flv -of lavf -vf scale=0:0,expand=0:0 -oac mp3lame -lameopts abr:br=56 -srate 22050 -ovc lavc -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 The resulting video is 3.30 rather than 3.53 and in fact, this difference is really visible and ugly when playing video. My mencoder version is *SVN-r1.0~rc3+svn20090426-4.4.3* and I'm running on Ubuntu 10.04 I would like to receive some hints about flv generation of these kinds of video. *Consider that I tried with many others h264 video and they always worked fine*, the only difference is the fps, all these successfully converted video have less than 30 fps while the above described video has 50 fps. Thanks in advance and best regards -- Raffaele Gambelli

4 4

disabling mpegts demuxer
by Tobias Brockamp 23 Aug '10

23 Aug '10

Hi i would like to disable the mpegts demuxer in my mplayer/mencoder setup. I read somewhere that it would be possible by adding "demuxer=.mpegts," to my config file, but for me it doesn't work. Can somebody tell me how to do this? Kind regards

1 0

How to rotate mp4 video.
by vikas khairnar 21 Aug '10

21 Aug '10

Hello, I want to rotate mp4 video by 90 degrees, how we can do that? Thanks.

2 1

Ripped DVD Sync issues
by - 18 Aug '10

18 Aug '10

I captured some footage the other day using my dvd recorder onto a dvd rw. I think that the files don't conform fully to the dvd standards, because mplayer is the only computer program that can play or rip the video correctly. Anyway, I used -dumpvideo and -dumpaudio to rip the content, and encoded it. I had to add an audio delay because they don't sync otherwise. The problem I have is that after about 45 minutes, the audio is now a second behind the video. Is it possible to stretch the audio in mencoder or will I have to drop a few frames from the video? I thought that the harddup option was supposed to sort out problems like these.

1 0

How to rotate flv video
by vikas khairnar 18 Aug '10

18 Aug '10

Hello, I want to rotate .FLV video by 90 degrees can you please tell me how to rotate it. Thanks in advance.

2 1

mencoder -ovc copy -oac copy h264 hangs
by Stefan Sassenberg 17 Aug '10

17 Aug '10

Hello, files from my video cam cannot be copied with mencoder. I get the following result: ds9 videoin # mencoder -v -ovc copy -oac copy 00041.MTS -o 00041.avi MEncoder 1.0rc3-4.3.4 (C) 2000-2009 MPlayer Team Configuration: init_freetype Using MMX (with tiny bit MMX2) Optimized OnScreenDisplay [file] File size is 60512256 bytes STREAM: [file] 00041.MTS STREAM: Description: File STREAM: Author: Albeu STREAM: Comment: based on the code from ??? (probably Arpi) success: format: 0 data: 0x0 - 0x39b5800 LAVF_check: MPEG-2 transport stream format Checking for YUV4MPEG2 ASF_check: not ASF guid! Checking for REAL Checking for SMJPEG Searching demuxer type for filename 00041.MTS ext: .MTS Checking for Nullsoft Streaming Video Checking for MOV Checking for VIVO header block 1 size: 0 Checking for PVA Checking for MPEG-TS... TRIED UP TO POSITION 4, FOUND 47, packet_size= 192, SEEMS A TS? 1 GOOD CC: 30, BAD CC: 0 TS file format detected. DEMUX OPEN, AUDIO_ID: -1, VIDEO_ID: -1, SUBTITLE_ID: -2, Checking for MPEG-TS... TRIED UP TO POSITION 4, FOUND 47, packet_size= 192, SEEMS A TS? 1 GOOD CC: 30, BAD CC: 0 PROBING UP TO 0, PROG: 0 COLLECT_SECTION, start: 64, size: 184, collected: 0 SKIP: 0+1, TID: 0, TLEN: 17, COLLECTED: 184 PARSE_PAT: section_len: 17, section 0/0 PROG: 1 (1-th of 2), PMT: 256 PROG: 0 (2-th of 2), PMT: 31 COLLECT_SECTION, start: 64, size: 184, collected: 0 SKIP: 0+1, TID: 2, TLEN: 57, COLLECTED: 184 FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 256, SIZE=184, M=0, ES_CNT=0, IDX=0, PMT_PTR=0x1277310 PROG DESCR, TAG=5, LEN=4(4) PROG DESCR, TAG=5, LEN=4(4) ...descr id: 0x5, len=8 PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x1011 (4113), type=0x10000005, ES_DESCR_LENGTH: 10, bytes left: 17 ...descr id: 0x5, len=4 ...descr id: 0x81, len=4 PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x1100 (4352), type=0x2000, ES_DESCR_LENGTH: 12, bytes left: 0 ---------------------------- COLLECT_SECTION, start: 64, size: 184, collected: 0 SKIP: 0+1, TID: 127, TLEN: 25, COLLECTED: 184 FILL_PMT(prog=0), PMT_len: 184, IS_START: 64, TS_PID: 31, SIZE=184, M=0, ES_CNT=0, IDX=1, PMT_PTR=0x1277590 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 0, TLEN: 17, COLLECTED: 184 PARSE_PAT: section_len: 17, section 0/0 PROG: 1 (1-th of 2), PMT: 256 PROG: 0 (2-th of 2), PMT: 31 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 2, TLEN: 57, COLLECTED: 184 FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 256, SIZE=184, M=0, ES_CNT=2, IDX=0, PMT_PTR=0x1277530 PROG DESCR, TAG=5, LEN=4(4) PROG DESCR, TAG=5, LEN=4(4) ...descr id: 0x5, len=8 PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x1011 (4113), type=0x10000005, ES_DESCR_LENGTH: 10, bytes left: 17 ...descr id: 0x5, len=4 ...descr id: 0x81, len=4 PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x1100 (4352), type=0x2000, ES_DESCR_LENGTH: 12, bytes left: 0 ---------------------------- COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 127, TLEN: 25, COLLECTED: 184 FILL_PMT(prog=0), PMT_len: 184, IS_START: 64, TS_PID: 31, SIZE=184, M=0, ES_CNT=0, IDX=1, PMT_PTR=0x1277590 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 0, TLEN: 17, COLLECTED: 184 PARSE_PAT: section_len: 17, section 0/0 PROG: 1 (1-th of 2), PMT: 256 PROG: 0 (2-th of 2), PMT: 31 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 2, TLEN: 57, COLLECTED: 184 FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 256, SIZE=184, M=0, ES_CNT=2, IDX=0, PMT_PTR=0x1277530 PROG DESCR, TAG=5, LEN=4(4) PROG DESCR, TAG=5, LEN=4(4) ...descr id: 0x5, len=8 PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x1011 (4113), type=0x10000005, ES_DESCR_LENGTH: 10, bytes left: 17 ...descr id: 0x5, len=4 ...descr id: 0x81, len=4 PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x1100 (4352), type=0x2000, ES_DESCR_LENGTH: 12, bytes left: 0 ---------------------------- COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 0, TLEN: 17, COLLECTED: 184 PARSE_PAT: section_len: 17, section 0/0 PROG: 1 (1-th of 2), PMT: 256 PROG: 0 (2-th of 2), PMT: 31 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 2, TLEN: 57, COLLECTED: 184 FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 256, SIZE=184, M=0, ES_CNT=2, IDX=0, PMT_PTR=0x1277530 PROG DESCR, TAG=5, LEN=4(4) PROG DESCR, TAG=5, LEN=4(4) ...descr id: 0x5, len=8 PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x1011 (4113), type=0x10000005, ES_DESCR_LENGTH: 10, bytes left: 17 ...descr id: 0x5, len=4 ...descr id: 0x81, len=4 PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x1100 (4352), type=0x2000, ES_DESCR_LENGTH: 12, bytes left: 0 ---------------------------- ... some more of these blocks, the last one is ---------------------------- COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 0, TLEN: 17, COLLECTED: 184 PARSE_PAT: section_len: 17, section 0/0 PROG: 1 (1-th of 2), PMT: 256 PROG: 0 (2-th of 2), PMT: 31 COLLECT_SECTION, start: 64, size: 184, collected: 184 SKIP: 0+1, TID: 2, TLEN: 57, COLLECTED: 184 FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 256, SIZE=184, M=0, ES_CNT=2, IDX=0, PMT_PTR=0x1277530 PROG DESCR, TAG=5, LEN=4(4) PROG DESCR, TAG=5, LEN=4(4) ...descr id: 0x5, len=8 PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x1011 (4113), type=0x10000005, ES_DESCR_LENGTH: 10, bytes left: 17 ...descr id: 0x5, len=4 ...descr id: 0x81, len=4 PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x1100 (4352), type=0x2000, ES_DESCR_LENGTH: 12, bytes left: 0 ---------------------------- Then, CPU is at 100% and have to kill mencoder with SIGKILL. ds9 videoin # uname -a Linux ds9 2.6.32-gentoo-r7 #3 SMP Sat Aug 7 09:52:23 CEST 2010 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ AuthenticAMD GNU/Linux Can you see, why? Is there any further information I can give? Thank you. Stefan

7 23

yadif doubling frame rate?
by Dominic Bird 16 Aug '10

16 Aug '10

Does anybody have any idea why I am ending up with 50fps files from this command? It should be interpolating 25 progressive frames from 50 fields but still ending up with 50fps files. Yadif seems quick and provides a good result but its not much good if it always doubles the frame rate! Am i missing an option for it out? I’ve tried it without the field dominance in there with no difference. Also tried pp=fd and still end up with 50fps. Maybe there is a better deinterlacing option i should try? Im not too fussed so long as its quick and has a reasonable result. mencoder -demuxer mov testmov.mov −field−dominance −1 -fps 25 -o testmov.flv -vf yadif=0,scale=480:-3 -af channels=2,resample=44100 -mc 0 -ovc x264 -x264encopts global_header:level_idc=30:bframes=0:bitrate=384:preset=veryfast:tune=fastdecode -oac faac -faacopts mpeg=4:object=2:br=64:raw -of lavf

3 3