August 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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yadif: what does "spatial interlacing check" mean?
by Christian Ebert 29 Jun '10

29 Jun '10

Hi, TFM say about the 2 and 3 options for yadif that they "skip spatial interlacing check". What does this mean exactly? What's the better way to go if I want better quality regardless of encoding time? And would recommendations differ if I use yadif in connection with mcdeint? TIA c -- \black\trash movie _C O W B O Y_ _C A N O E_ _C O M A_ Ein deutscher Western/A German Western -->> http://www.blacktrash.org/underdogma/ccc.html -->> http://www.blacktrash.org/underdogma/ccc-en.html

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edl for transport stream
by Malte Schünemann 07 Nov '09

07 Nov '09

My receiver for TV programmes stores videos as transport stream. I tried cutting out scenes (e.g. commercials) using -edl - however, it seems that the transaport stream does not use seconds as time unit. Even edl scripts created via -edlout do not work - scenes cut out are different from what I selected before. Sure, I can re-encode using mencoder and do that job with the output file - in fact, this is what I am doing now. However, does anybody know how I can edit the transport stream properly ? It would spare me one long step of re-emcoding. Malte

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Hauppauge HD-PVR video causes MEncoder to crash
by Andrew Berg 01 Sep '09

01 Sep '09

I've been capturing video with a Hauppauge HD-PVR and all attempts to convert it with MEncoder have failed. Both MPlayer and MEncoder crash during encoding or playback at a certain point (varies between videos, but constant between decoders for the same video). I get a few error messages during encoding: [h264 @ 00D9A434]non-existing SPS 15 referenced in buffering period [h264 @ 00D9A434]number of reference frames exceeds max (probably corrupt input), discarding one [h264 @ 00D9A434]illegal num_reorder_frames 29 [h264 @ 00D9A434]mmco: unref short failure I've tried remuxing, but the container doesn't seem to be the problem. My guess is that the AVC stream is causing the decoder to crash and take MEncoder/MPlayer with it. With MEncoder, it's a hard crash caught by Windows, but MPlayer exits with the message "MPlayer interrupted by signal 11 in module: filter_video". I've tried using the different AVC decoders, but the result is the same for all. The video is 1920x1080i AVC 13Mbps CBR with AC3 384Kbps CBR in an MPEG-TS container.

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Re: [MEncoder-users] encode to transport stream
by Malte Schünemann 31 Aug '09

31 Aug '09

> -----Ursprüngliche Nachricht----- > Von: "socke" <socke-99(a)gmx.de> > Gesendet: 31.08.09 11:18:24 > An: MEncoder usage discussions <mencoder-users(a)mplayerhq.hu> > Betreff: Re: [MEncoder-users] encode to transport stream > I suggest to use DVBCut then. It cuts transport streams directly and > doesn't have to re-encode the video, except at the cut points where the > streams would be broken otherwise. Unfortunately it doesn't work with > HDTV recordings. > > http://dvbcut.sourceforge.net/ > > Ben Thanks ... tried that, but DVBCut appears to not recognise the format. It just tells me 'Unknown file type'. Malte > > > Malte Schünemann schrieb: > > >From my SAT receiver I get viodeos as transport stream. To edit them (cut out commercials, advertisement ...) and burn a DVD, I convert to AVI format. > > > > However, I sometime would like to have the edited video on disk and view them from there. So I need to convert ack to transport stream. Which codec will I have to use ? > > > > midentify shows me > > ID_DEMUXER=mpegts > > for the original video. > > > > Malte > > ________________________________________________________________ > > Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate > > für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/ > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > MEncoder-users mailing list > > MEncoder-users(a)mplayerhq.hu > > https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users > _______________________________________________ > MEncoder-users mailing list > MEncoder-users(a)mplayerhq.hu > https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users > ______________________________________________________ GRATIS für alle WEB.DE-Nutzer: Die maxdome Movie-FLAT! Jetzt freischalten unter http://movieflat.web.de

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Extract audio from video stream
by Malte Schünemann 31 Aug '09

31 Aug '09

I would like to extract the audio part of a video stream. I would like to play that e.g. using mplayer. How can I do this ? Malte ________________________________________________________________ Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/

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encode to transport stream
by Malte Schünemann 31 Aug '09

31 Aug '09

>From my SAT receiver I get viodeos as transport stream. To edit them (cut out commercials, advertisement ...) and burn a DVD, I convert to AVI format. However, I sometime would like to have the edited video on disk and view them from there. So I need to convert ack to transport stream. Which codec will I have to use ? midentify shows me ID_DEMUXER=mpegts for the original video. Malte ________________________________________________________________ Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/

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Re: [MEncoder-users] createing avi with opendml < 1 GB
by Juergen Bausa 29 Aug '09

29 Aug '09

> Von: "RC" <cooleyr(a)gmail.com> > On Fri, 28 Aug 2009 07:55:20 +0000 (UTC) > Juergen Bausa <Juergen.Bausa(a)web.de> wrote: > > > If there is curently no switch, could mencoder be patched? > > Yes. Line ~29 libmpdemux/muxer_avi.c: > #define ODML_CHUNKLEN .... to what value do I need to set ODML_CHUNKLEN in order to always produve openDML output? Set it to 0? Is there any change to define a command line parameter to handle this? Juergen ________________________________________________________________ Neu: WEB.DE Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate für nur 19,99 Euro/mtl.!* http://produkte.web.de/go/02/

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How do I obtain patent licensing for so I can distribute several DVD video disks?
by D. Arnold 29 Aug '09

29 Aug '09

Hi. First post here. I want to give friends and a local library some DVD video disks with restored public domain movies that would play in common movie players. That would make me a small scale manufacturer and distributor. I have had no success finding how to obtain patent licensing for the disks and the encoding methods. Can anyone tell me how a hobbyist might obtain patent licensing for distributing a few dozen DVD video disks with the audio-visual encoding methods used for DVD video?

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