July 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

Can you slow down mencoder?
by Jonathan Lundberg 20 Aug '05

20 Aug '05

Hello all, My situation is that I need to encode the same content from a video grab card to two different bitrates at the same time. The files need to be ready for use at roughly the same time (ie, the end of the show!). Unlike Windows Media Encoder, or Helix Producer, it's not possible with mencoder to grab to two different output rates at the same time (or am I wrong???). What I have to do is grab from the tv capture card to filename.avi, and while it's still grabbing from the tv card, run mencoder against filename.avi to also produce an identical file at a lower bitrate. My problem is that the second mencoder runs faster than real time, catches up with the end of the file, and then exits while the primary encode is still running. Is it possible to slow down mencoder so that it also runs in realtime, so that if I start it running 10 seconds after the initial grab, it'll run second by second against the file being grabbed, instead of 'as fast as computerly possible'? Or is there some other way to feed the content of filename.avi into mencoder in real time for encoding? Cheers, Jonathan ****************************************************************************** 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. ******************************************************************************

10 28

ERROR: SCR: warning; what does that mean?
by Brian Keener 07 Aug '05

07 Aug '05

I'm re-encoding a huffyuv-encoded file to mpeg2, dvd-compatible video stream. My command line is: mencoder tv.avi -of mpeg -oac lavc -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=8000:keyint=25 -vf hqdn3d,pullup,pp=md,scale=720:480 -noskip -o tvout.mpg I'm pretty happy with the quality, but I'm still getting lots of errors like ERROR: SCR: 874360377, APTS: 844830475, DELTA=-0.320 secs ERROR: SCR: 874469454, APTS: 849649125, DELTA=-0.269 secs ERROR: SCR: 874578531, APTS: 856877100, DELTA=-0.192 secs ERROR: SCR: 874687608, APTS: 864105075, DELTA=-0.115 secs ERROR: SCR: 874796685, APTS: 871333050, DELTA=-0.038 secs Also, mencoder seems to try to maintain re-encoding performance of ~30fps, when I'd expect the re-encoding to run substantially slower, especially with the scaling/noise reduction/etc. I'm not talking about the fps of the outputted file, I'm talking about the number of frames processed by mencoder per second. Any information? Brian K

6 13

How to convert an audio file?
by Hans Spath 06 Aug '05

06 Aug '05

I have a realaudio file, created with "mplayer -dumpstream $URL". My audio player (foobar2000) can not play it at all, and mplayer can not seek in it. So I wanted to convert it to mp3. My attempt[1] using mencoder for that task didn't lead to success. Any suggestions / dirty tricks how I could achieve this goal even if mencoder is not capable of handling audio-only files? Btw. why can mencoder do an audio-only output (-of rawaudio) but can't handle audio-only input? PS: I use the Windows versions of mplayer/mencoder. [1] $PROMPT>mencoder interview.ra -oac mp3lame -lameopts preset=128 -of mpeg -o interview.mp3 MEncoder dev-CVS-050626-17:02-3.4.2 (C) 2000-2005 MPlayer Team CPU: Intel Pentium 4/Xeon/Celeron Northwood (Family: 8, Stepping: 3) Detected cache-line size is 64 bytes CPUflags: Type: 8 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0 Compiled with runtime CPU detection - WARNING - this is not optimal! To get best performance, recompile MPlayer with --disable-runtime-cpudetection. File not found: 'frameno.avi' Failed to open frameno.avi success: format: 0 data: 0x0 - 0x331800 REAL file format detected. Stream description: audio/x-pn-multirate-realaudio logical stream Stream mimetype: audio/x-pn-realaudio Video stream is mandatory! Exiting...

6 8

how to mencoder grab ctrl+c interrupt ?
by Chang Min Jeon 28 Jul '05

28 Jul '05

I downloaded mplayer source from CVS(2005.6.30) I changed mencoder.c following line. // before int main(int argc, char* argv[]) // after int startEncoding(int argc, char* argv[]) and then I made mencoder source to dynamic library. I created app to encode video and audio data from TV CARD by calling startEncoding function. example . following line //global variable SDL_Thread* thread; int main(int argc, char* argv[]) { startenc(argc, argv); sleep(5); SDL_KillThread(thread); //problem occur. certainly thread was killed. But startEncoding still conduct to encode audio and video data. sleep(10); return 0; } void startenc(int argc, char* argv[]) { thread = SDL_CreateThread((int (*)(void *))startEncoding, NULL); }

1 0

mencoder skipping frames.
by AaronL 27 Jul '05

27 Jul '05

Why is mencoder skipping frames on 24000/1001 progressive content when I'm trying to encode with the same -ofps 24000/1001? When I play back the encoded video, I can see the jump in the video at the location where a frame skip occured. Attached is my commandline and the output messages from mencoder. I'm using release pre7. Can someone explain what's happening? thanks. ######### Command line ########################################## mencoder dvd://1 -ofps 24000/1001 -oac mp3lame -lameopts cbr:q=0:br=128 -vf crop=704:464:8:6 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1328:v4mv:mbd=1:autoaspect:vpass=1 -aid 128 -o output.avi ######### mencoder output messages ############################## demux_mpg: 24000/1001fps progressive NTSC content detected, switching framerate. Pos: 29.0s 742f ( 0%) 22fps Trem: 60min 330mb A-V:0.087 [759:128] Skipping frame! Pos: 328.6s 7926f ( 4%) 34fps Trem: 73min 1169mb A-V:0.085 [1343:128] Skipping frame! Pos: 850.6s 20445f (12%) 33fps Trem: 75min 1340mb A-V:0.084 [1468:128]] Skipping frame! Pos:1174.2s 28203f (16%) 33fps Trem: 74min 1350mb A-V:0.085 [1412:128] Skipping frame! Pos:1679.2s 40314f (22%) 33fps Trem: 70min 1378mb A-V:0.084 [1414:128]] Skipping frame! Pos:2112.9s 50712f (27%) 33fps Trem: 66min 1382mb A-V:0.085 [1402:127] Skipping frame! Pos:2402.8s 57665f (31%) 33fps Trem: 63min 1388mb A-V:0.084 [1400:128] Skipping frame! Pos:2568.9s 61649f (33%) 33fps Trem: 61min 1387mb A-V:0.086 ....(cut)..... Skipping frame! Pos:4550.6s 109168f (58%) 33fps Trem: 39min 1386mb A-V:0.084 [1358:128] Skipping frame! Pos:4763.6s 114277f (61%) 33fps Trem: 36min 1383mb A-V:0.084 [1358:128] Skipping frame! Pos:5056.3s 121296f (64%) 33fps Trem: 33min 1377mb A-V:0.084 [1344:128] Skipping frame! Pos:5490.3s 131704f (70%) 33fps Trem: 27min 1378mb A-V:0.085 [1354:128]] Skipping frame! ODML: Starting new RIFF chunk at 1023MB.24min 1373mb A-V:0.075 [1342:128] Pos:5894.2s 141388f (75%) 33fps Trem: 23min 1379mb A-V:0.084 [1339:128] Skipping frame! Pos:6288.1s 150834f (79%) 33fps Trem: 18min 1373mb A-V:0.084 [1325:128]] Skipping frame! Pos:6765.6s 162285f (85%) 33fps Trem: 13min 1366mb A-V:0.084 [1311:128]] Pos:7868.7s 188738f (100%) 33fps Trem: 0min 1375mb A-V:0.014 [1328:128] Flushing video frames

5 11

NTSC and Questions about quality
by Pete Davis 27 Jul '05

27 Jul '05

The main thing I'm using mencoder for these days is encoding stuff I'm capturing off of my DirectTV dish. I'm generally using lavc a bitrate of 1100. The only non-default options in regards to quality that I have are keyint=30 and mbd=2. I've been messing around with some other options, such as nr=400, trell, trell and cbp. But the truth is, I can't see any noticeable difference at all from these options, even on my computer (which has a much better image than the TV, of course). Except for some slight blocky pixilation with large solid colors (especially darker colors), the encodings with mbd=2 are just about as good as the original broadcast. I suppose that with DVDs, where the original image quality is so high, these options probably have a bit more of an impact, but for NTSC stuff, I just can't see it. Are there options for handling the blocky pixilation? It's not noticeable enough that I'm willing to sacrifice much in terms of encoding speed to get rid of it. I've tested the bitrates down as low as 600 and while that was noticeable, at around 800, the image quality is almost the same as 1100. I'm trying to decide if the difference in quality is worth the space savings. Pete

3 3

Marius Schaefer is out of the office.
by Marius Schaefer/Camberg/ISBAC 26 Jul '05

26 Jul '05

I will be out of the office starting 22.07.2005 and will not return until 01.08.2005. I will respond to your message when I return.

1 0

mplayer becomes unkillable process on FC3
by Tom Friedel - Ready Ink Incorporated 26 Jul '05

26 Jul '05

A few weeks ago I downloaded the latest RPM for Fedora Core 3, and sometimes, maybe 1 out of 5, it hangs after saying Playing dvd://1. The problem is I can not kill the process, even with -9. I will be glad to answer any questions or run any tests, tom http://www.readyink.com [root@fc3 ~]# [root@fc3 ~]# mplayer dvd://1 MPlayer 1.0pre7-RPM-3.4.2 (C) 2000-2005 MPlayer Team CPU: Intel (Family: 8, Stepping: 10) Detected cache-line size is 64 bytes CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection - WARNING - this is not optimal! To get best performance, recompile MPlayer with --disable-runtime-cpudetection. Playing dvd://1.

2 1

What options are added to the mencoder to disable audio play during encoding from TV CARD?
by Chang Min Jeon 24 Jul '05

24 Jul '05

What options are added to the mencoder to disable audio play during encoding from TV CARD?

4 5