Mencoder for Dummies?

[bcjenkins]

I need help with a command line to use with mencoder. I am trying to remove sections of the video based on an edl file. This seemingly works on SD content, but failed on the first HD show I threw at it.

Does anyone have an easy way to explain what the command syntax is for deinterlacing and ivtc for a tv show?

The show is Las Vegas which seems to be recorded in 24000/1001 but telecined to 30000/1001. It is also broadcast in 1080i.

TIA

B

PS Please feel free to correct my wording

[evilpenguin]

Unfortunately, cutting commercials straight from the mpegs with mencoder is pretty shaky. A lot of the times, especially with HD shows, there are issues with the timeline that prevent it from working. On windows there are a few good GUI tools that can handle this, but on linux, i'm not sure what's available. Honestly, I just convert the video first and then cut the commercials afterwards.

As for 1080i/720p IVTC, here's a good post from lobolsrul on the topic...

http://forums.sagetv.com/forums/show...6&postcount=11

Also, here's a PM he sent me with more information...

Originally Posted by lobosrul

Heres the exact chain if I was encoding a 1080i30 show to 1080p24 (reverse telecine).

E:\ is my recording drive, E:\new\ is just a working temp directory. "start /b /low /wait" Has nothing to do with encoding, its just for running mencoder in low priority mode.

1 "C:\Sagemen\vp.vbs" "E:\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.vprj" "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0-clean.mpg"  
2 start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0-clean.mpg"   -vf pullup,softskip,crop=1728:972:96:54,scale=1152:648,harddup -ofps 23.976  -oac copy  -ovc x264 -x264encopts deblock:qcomp=.65:bframes=3:turbo=2:threads=2:b_pyramid:pass=1:bitrate=3000 -of rawaudio -o "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.ac3"
3 start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0-clean.mpg"   -vf pullup,softskip,crop=1728:972:96:54,scale=1152:648,harddup -ofps 23.976  -oac lavc -lavcopts acodec=mp2   -ovc x264 -x264encopts deblock:qcomp=.65:subq=5:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:threads=2:pass=2:bitrate=3000 -of rawvideo -o "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.264"
4 "C:\Sagemen\Besweet\besweet.exe" -core( -input  "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.ac3" -output "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.wav" -6chwav )
5 "C:\sagemen\neroAacEnc.exe" -cbr 192000 -ignorelength -if "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.wav" -of "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.aac"
6 "C:\sagemen\MP4Box.exe" -add "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.aac " -add "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.264" "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.avi" -fps 23.976

Line one is removing commercials with videoredo.

Yes, mencoder is creating a raw 264 and raw ac3 file. Note that I am creating the 264 file in the second pass, thats very important. I also found that for some reason encoding audio in both passes sometimes helped keep audio sync, even though its discarded; mp2 encoding is very quick.

Mp4box requires that your 264 and ac3 files have those exact file extensions BTW.

After this comes cleanup of all the temp files, running touch.exe on the final avi file, and the original mpg with it. I'm sure you know how to do that so I'll leave it out.

I'm using an avi extension because it seemed like SageTV was deleting .mp4's for some reason.

For 1080i30 to 1080p30 (de-interlacing) replace lines 2 and 3 with:

start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0-clean.mpg"   -vf yadif,crop=1728:972:96:54,scale=1152:648,harddup -ofps 29.97  -oac copy  -ovc x264 -x264encopts deblock:qcomp=.65:bframes=3:turbo=2:threads=2:b_pyramid:pass=1:bitrate=3000 -of rawaudio -o "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.ac3"
 start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0-clean.mpg"   -vf yadif,crop=1728:972:96:54,scale=1152:648,harddup -ofps 29.97  -oac lavc -lavcopts acodec=mp2   -ovc x264 -x264encopts deblock:qcomp=.65:subq=5:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:threads=2:pass=2:bitrate=3000 -of rawvideo -o "E:\new\HowIMetYourMother-HowIMetEveryoneElse-2561111-0.264"

For 720p60 to 720p24:

start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\House-GuardianAngels-2561915-0-clean.mpg"   -vf decimate=2:1000:1600:.001,scale=0:0,harddup -ofps 23.976 -oac copy  -ovc x264 -x264encopts deblock:qcomp=.65:bframes=3:turbo=2:threads=2:b_pyramid:pass=1:bitrate=3000 -of rawaudio -o "E:\new\House-GuardianAngels-2561915-0.ac3"
 start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\House-GuardianAngels-2561915-0-clean.mpg"   -vf decimate=2:1000:1600:.001,scale=0:0,harddup -ofps 23.976 -oac lavc -lavcopts acodec=mp2   -ovc x264 -x264encopts deblock:qcomp=.65:subq=5:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:threads=2:pass=2:bitrate=3000 -of rawvideo -o "E:\new\House-GuardianAngels-2561915-0.264"

Sometimes the frame pattern in 720p gets jumbled, leading to messy encodes. So I generally just leave it as 720p60. This takes a lot longer to encode but the end result isn't really less efficient.

For 720p60:

start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\House-GuardianAngels-2561915-0-clean.mpg"   -vf crop=1152:648:64:36,scale=0:0,harddup  -oac copy  -ovc x264 -x264encopts deblock:qcomp=.65:bframes=3:turbo=2:threads=2:b_pyramid:pass=1:bitrate=3000 -of rawaudio -o "E:\new\House-GuardianAngels-2561915-0.ac3"
 start /b /low /wait C:\Sagemen\mencoder.exe  "E:\new\House-GuardianAngels-2561915-0-clean.mpg"   -vf crop=1152:648:64:36,scale=0:0,harddup  -oac lavc -lavcopts acodec=mp2   -ovc x264 -x264encopts deblock:qcomp=.65:subq=5:8x8dct:frameref=2:bframes=3:b_pyramid:weight_b:threads=2:pass=2:bitrate=3000 -of rawvideo -o "E:\new\House-GuardianAngels-2561915-0.264"

Don't forget, the fps used with mencoder must match with mp4box (or any other muxer you use). Thats actually 59.94 in 720p60.

Scale is set at 0:0. Thats the same as leaving the scale tag out.

If you want 2 channel audio, regardless if the source is 5.1 or 2.0 (those are the only 2 I've seen on TV). Replace lines 4 and 5 with:

"C:\Sagemen\Besweet\besweet.exe" -core( -input  "E:\new\House-GuardianAngels-2561915-0.ac3" -output "E:\new\House-GuardianAngels-2561915-0.wav" -2ch )
 "c:\sagemen\neroAacEnc.exe" -cbr 64000 -ignorelength -if "E:\new\House-GuardianAngels-2561915-0.wav" -of "E:\new\House-GuardianAngels-2561915-0.aac"

Of course you can change the bitrate to whatever.

Hope that helps you out.

[bcjenkins]

I found this while looking for an answer. I will have to try this out.

B

http://www.mit.jyu.fi/mweber/blog/In...s_streams.html