August 2005 - MEncoder-users - lists.mplayerhq.hu

Call for video encoding settings
by Guillaume POIRIER 25 Sep '05

25 Sep '05

Hello folks, I'd like to add some encoding settings examples in our HTML documentation. Those settings off course highly depend on personal preferences, so highlighting a certain encoding setting as "very high quality", "high quality", "fast", and "realtime" won't probably make everyone happy, but I guess it'll still be better than having nothing. Here is what I propose (for lavc MPEG-4, XviD and x264, but I'm also interested in MPEG-2, wmv... settings, also long as it's supported by MEncoder off course). * Very High Quality: lacv: ? XviD: chroma_opt:vhq=4:bvhq=1:gmc:quant_type=mpeg x264: subq=6:4x4mv:8x8dct:me=3:frameref=5:bframes=3:b_pyramid:weight_b * High quality: lavc: vcodec=mpeg4:mbd=2:trell:v4mv:last_pred=2:dia=-1:vmax_b_frames=1:cmp=3:subcmp=3:precmp=0:vqcomp=0.6:turbo XviD: vhq=2:bvhq=1:psnr:chroma_opt:quant_type=mpeg x264: subq=5:4x4mv:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b * Fast: lavc: vcodec=mpeg4:mbd=2:trell:v4mv XviD: -- (default) x264: subq=4:bframes=2:b_pyramid:weight_b * Realtime: lavc: vcodec=mpeg4:mbd=2:turbo XviD: turbo:nochroma_me:notrellis:max_bframes=0:vhq=0 x264: (irrevelant) Guillaume -- A lie gets halfway around the world before the truth has a chance to get its pants on. -- Winston Churchill

12 37

[Script] PSNR between two video files
by Matthias Wieser 12 Sep '05

12 Sep '05

Hi, I have created a script (called psnr-video.sh) to calculate the PSNR between two existing video files. The PSNR is calculated frame by frame. Additionally an overall PSNR is calculated. The output file can be used for plots of the frame by frame PSNR. "What's the purpose of this script, as there is already the mencoder option 'psnr'"? mencoder [...]:psnr only shows the psnr of the video codec. Video filters like scaling, denoise3d, pp=fd cannot be tested with this option. psnr-video.sh can be used to * compare different softwarescalers (should I use -sws 1 or -sws 2) * compare different resolutions (is it better to scale down to 640x360 or to 560x320) * compare different deinterlacers * compare different video codecs * compare video filters (is it better to use -vf hqdn3d or lavcopts:nr=400) * [...] Example: ./psnr-video.sh ./orig.avi ./test.avi 247 Creates a file psnr.dat with the following content: File;Y;Cb;Cr 00000001.ppm;34.23;39.54;40.06;35.426 00000002.ppm;33.03;38.71;39.26;34.271 00000003.ppm;33.45;38.91;39.28;34.655 00000004.ppm;32.72;38.69;38.85;33.972 [...] 00000247.ppm;35.55;40.84;42.15;36.785 PSNR:;35.9887 ------- Usage: psnr-video.sh <file1> <file2> [<frames>] [<options1>] [<options2>] <file1> and <file2> are the video files for which the PSNR should be calculated. [<frames>] is the number of frames to process, starting from frame 1. [<options1>] are additional MPlayer options for <file1> [<options2>] are additional MPlayer options for <file2> Be aware that psnr-video.sh needs a lot of temporal space inside /temp/. ------- Comments? If you find it usefull you may add it to [CVS]main/TOOLS/ Regards, Matthias

3 7

Need some hints for my tv recording concept
by Gerhard Brauer 01 Sep '05

01 Sep '05

Hi, it's my first posting on the list and i would like to get some special hints for an generally exercise: tv recording on pc. First: at the moment, after researching and try-and-error, i have (for me) a working concept for recording and watching on/from tv. But i'm sure there are things i could do better. My equipement ist low: i use a digital sat receiver. A friend gave me his old analog tv card, which i connected over s-video with the receiver. My vcr-pc is a 500Mhz P3, don't laugh ;-), with an ATI Rage128 tv-out. For me, it's a null cent solution to record and watch video/dvd. My first tries goes to record at full pal resolution, but therefor my pc is to slow (video buffer full) when i must use a compressed video codec (mjpec i think is good codec for real time). After accepting this i used solution A: A) record at 352x288 These are the parameters for my mencoder record script: -------------INPUT ---------------------# ## ### TV TV="driver=v4l2:device=/dev/video:input=1:amode=1" TVOPT=":mjpeg:decimation=2:quality=100" # ------------ OUTPUT --------------------# ## ### VIDEO VID="lavc" # -ovc VIDOPT="-lavcopts vcodec=mjpeg:mbd=1:autoaspect:abitrate=128:acodec=ac3:mv0:nr=10" ## ### AUDIO AUD="lavc" # -oac AUDOPT="" With this i get records in a good quality, a bit big size and moderate cpu usage. Next step is: reduce file size, improve quality. Watching the recorded video on tv, which is much worse than my pc monitor, is ok but on pc (full screen scaling) there are edges, flicker,... So i reencode the video later on a faster pc after recording where i must not care about real time things: -vf pp=de,scale=704:544,denoise3d -oac copy -ovc lavc -lavcopts vcodec=mpeg4:mbd=1:aspect=4/3 -sws 1 -ffourcc divx With this second process i got a video with "good" quality, low size. And here i have some questions: a) scaling the low source video to a bigger size, isn't this not something like "interpoling" by low-budget scanners? My thought was that software scaling may have a better quality then later scaling in real time by hardware? b) Are there filters,one/two pass runs or any other parameters,things you would do? I tested a lot but mostly i do not see a real difference. c) The -ffourcc option. Is it correct that lavc with vcodec=mpeg4 produce a divx coded video? All my linux player accepted the coded videos but on a friends windows pc (with vlc player) it wouldn't play. Only until i use the above -ffourcc with divx or DX50 he could play it. So: is this option rather a cosmetic entry in the header or do i really change the codec by setting/changing this parameter? My solution B and my actual solution: My thougt was: as better the source materials resolution then the rescaled video is also better, nevertheless if i do this by software or hardware. Solution B record parameters) ## ### TV TV="driver=v4l2:device=/dev/video:input=1:amode=1" TVOPT=":mjpeg:decimation=1:quality=80:width=544:height=408" # ------------ OUTPUT --------------------# ## ### VIDEO VID="lavc" # -ovc VIDOPT="-lavcopts vcodec=mjpeg:mbd=1:aspect=4/3:abitrate=128:acodec=ac3:mv0:nr=10" ## With this i get a 544x408 video and this resolution is about the max what my pc could record without overfulled video buffer. This source material could i reencode as above to divx plus filters. I think rescaling produces a very better result than the result from solution A. Or BTW i don't need rescaling anymore. Especially watching on pc is much better. So: actually i am pleased with this concept. And yes, after seeing that a newbie like me could get good results i thought about buying a DVD card. But i'm curious about getting some hints to do it better or in an other way. Greetings Gerhard

3 8

creating a quicktime movie from jpeg images
by Jesse Corrington 31 Aug '05

31 Aug '05

how would i go about creating a quicktime movie from jpeg images. Thanks for the help. _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

2 1

creating an avi movie from jpeg images
by Jesse Corrington 31 Aug '05

31 Aug '05

I am attempting to create an avi movie from jpeg images, that i can play in windows media player. Here is what i am doing, but it will not play (it is creaetd though). I have downloaded and installed an xvid codec. I have tried all these different things. Thanks in advance for the help. mencoder mf://*.jpg -mf type=jpg -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=16000 -nosound -o \ corrppmovie.avi mencoder mf://*.jpg -mf type=jpg -ovc lavc -ffourcc xvid -nosound -o corrppmovie.avi mencoder mf://*.jpg -mf type=jpg -ovc lavc -lavcopts \ vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3 -ffourcc xvid -o test.avi _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

3 2

Need some hints for my tv recording concept
by Gerhard Brauer 31 Aug '05

31 Aug '05

Hi, it's my first posting on the list and i would like to get some special hints for an generally exercise: tv recording on pc. First: at the moment, after researching and try-and-error, i have (for me) a working concept for recording and watching on/from tv. But i'm sure there are things i could do better. My equipement ist low: i use a digital sat receiver. A friend gave me his old analog tv card, which i connected over s-video with the receiver. My vcr-pc is a 500Mhz P3, don't laugh ;-), with an ATI Rage128 tv-out. For me, it's a null cent solution to record and watch video/dvd. My first tries goes to record at full pal resolution, but therefor my pc is to slow (video buffer full) when i must use a compressed video codec (mjpec i think is good codec for real time). After accepting this i used solution A: A) record at 352x288 These are the parameters for my mencoder record script: -------------INPUT ---------------------# ## ### TV TV="driver=v4l2:device=/dev/video:input=1:amode=1" TVOPT=":mjpeg:decimation=2:quality=100" # ------------ OUTPUT --------------------# ## ### VIDEO VID="lavc" # -ovc VIDOPT="-lavcopts vcodec=mjpeg:mbd=1:autoaspect:abitrate=128:acodec=ac3:mv0:nr=10" ## ### AUDIO AUD="lavc" # -oac AUDOPT="" With this i get records in a good quality, a bit big size and moderate cpu usage. Next step is: reduce file size, improve quality. Watching the recorded video on tv, which is much worse than my pc monitor, is ok but on pc (full screen scaling) there are edges, flicker,... So i reencode the video later on a faster pc after recording where i must not care about real time things: -vf pp=de,scale=704:544,denoise3d -oac copy -ovc lavc -lavcopts vcodec=mpeg4:mbd=1:aspect=4/3 -sws 1 -ffourcc divx With this second process i got a video with "good" quality, low size. And here i have some questions: a) scaling the low source video to a bigger size, isn't this not something like "interpoling" by low-budget scanners? My thought was that software scaling may have a better quality then later scaling in real time by hardware? b) Are there filters,one/two pass runs or any other parameters,things you would do? I tested a lot but mostly i do not see a real difference. c) The -ffourcc option. Is it correct that lavc with vcodec=mpeg4 produce a divx coded video? All my linux player accepted the coded videos but on a friends windows pc (with vlc player) it wouldn't play. Only until i use the above -ffourcc with divx or DX50 he could play it. So: is this option rather a cosmetic entry in the header or do i really change the codec by setting/changing this parameter? My solution B and my actual solution: My thougt was: as better the source materials resolution then the rescaled video is also better, nevertheless if i do this by software or hardware. Solution B record parameters) ## ### TV TV="driver=v4l2:device=/dev/video:input=1:amode=1" TVOPT=":mjpeg:decimation=1:quality=80:width=544:height=408" # ------------ OUTPUT --------------------# ## ### VIDEO VID="lavc" # -ovc VIDOPT="-lavcopts vcodec=mjpeg:mbd=1:aspect=4/3:abitrate=128:acodec=ac3:mv0:nr=10" ## With this i get a 544x408 video and this resolution is about the max what my pc could record without overfulled video buffer. This source material could i reencode as above to divx plus filters. I think rescaling produces a very better result than the result from solution A. Or BTW i don't need rescaling anymore. Especially watching on pc is much better. So: actually i am pleased with this concept. And yes, after seeing that a newbie like me could get good results i thought about buying a DVD card. But i'm curious about getting some hints to do it better or in an other way. Greetings Gerhard

3 2

Re: [MEncoder-users] Free of patents codec
by Raphael 27 Aug '05

27 Aug '05

Reimar Döffinger wrote: > Hi, > On Mon, Aug 22, 2005 at 04:47:58PM +0100, Raphael wrote: > > >> And yes.. you are right... sadly a lot of the law has that affect on >> people these days. If are in the UK see the fear the words "Data >> protection Act" and "Health and Safety" engenders in people. Then ask >> them if they know anyone (or anyone who knows anyone) who has ever >> been sued or sent to jail for breaking these terrifying laws. >> > > > It does not matter whether they affect anyone or not. The point of laws > is having rules, so that you can estimate what the risk of doing a > certain thing is (the german word is "Rechtssicherheit"), otherwise we > wouldn't need any laws and could just say "let the judges decide > whatever they think is right". > With software patents and laws like the DMCA that security has left most > of the computer areas. Sure, lost security does not mean anyone is > actually in danger, but I prefer to have security! > Although on a bit a different topic, at least for those "anti terror > laws" > I can directly point to a certain person in London who was affected by > them. Maybe sometimes it is a good idea not to way until someone gets > hurt. > I guess they should have called them "police terror laws" after > all, at least people would have had realistic expectations about them. > > Well.. while we are off topic :) Actually all UK law is like this (as is US law). I.e. there is statute law and there is case law. Until something is tested in court it is often unclear whether it is a crime (in the case of criminal law) or not. In other words, you can't necessarily tell how the courts will interpret the statute just by reading it and sometimes (often ?) things are deliberately left to the courts to decide. this means that strictly speaking we all live in a constant state of uncertainty about the law. The innocent guy who got shot was not caught by any of this of course but that is a different (and rather sad) topic. Raphael

2 1

calculating SCALE
by Tomáš Bažant 25 Aug '05

25 Aug '05

Got a simple task: to encode DVD title to lavc/mpeg4 file. After getting aspect ratio, initial width x height of the frame, cropping parameters and let's say the SCALE desired target width of 640, how can I calculate the remaining SCALE height for mencoder -vf scale 640:?? -zoom option? thank you toba

4 7

-noodml flag ignored in mencoder?
by Jonathan Lundberg 23 Aug '05

23 Aug '05

Hi all, In libmpdemux/muxer_avi.c the following line exists: int write_odml = 1; There is nowhere else in that file where it looks like that variable is changed or overwritten. In cfg-mencoder.h there is a line: {"noodml", &write_odml, CONF_TYPE_FLAG, 0, 1, 0, NULL} Does this mean that the write_odml variable is hard coded to always be set, and that the -noodml flag is in fact ignored or useless? Cheers, Jonathan (apologies for sig, trying to find alternate mail server) ****************************************************************************** The information in this e-mail is confidential and may be legally privileged. It is intended solely for the addressee. Access to this e-mail by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. Please note that emails to, from and within RTÉ may be subject to the Freedom of Information Act 1997 and may be liable to disclosure. ******************************************************************************

3 2

chanlist values for Asia
by list wad 23 Aug '05

23 Aug '05

Hello, I cannot seem to find any information on valid '-tv' 'chanlist=' values. The manpage peters out as soon as it states the western world. I am specifically interested in the values for Hong Kong, Taiwan, and China. Since I am here, any command line copies that users from these areas use would be appreciated too. Thanks for any info.

1 0