[MEncoder-users] performance with large files

[Tobias Brockamp]

Nobody an idea?

:-(

Am 17.09.2007 um 17:59 schrieb Tobias Brockamp:

> Hi everybody,
>
> i'm encoding large raw-avi files f.e. 11 GB in size to xvid/mp3 avi.
> I've recognized that mencoder went very slow:
>
> mencoder -of avi -ovc xvid -ofps 25 -oac mp3lame -srate 44100
> -audio-preload 1.5 -mc 0 -vf
> scale,format=rgb24,scale,format=yv12,pp=lb,harddup -xvidencopts
> "threads=2:par=1/1:max_key_interval=250:nopacked:closed_gop:rc_reactio 
> n_delay_factor=16:rc_averaging_period=100:notrellis:bitrate=1500:min_i 
> quant=1:max_iquant=31:min_pquant=1:max_pquant=31:min_bquant=1:max_bqua 
> nt=31:max_bframes=2:bquant_ratio=150:bquant_offset=100:me_quality=6:lu 
> mi_mask:chroma_me:qpel:gmc:vhq=4:bvhq=1:quant_type=h263"
> -lameopts "cbr:preset=128:mode=0" -o output.avi input.avi
>
> For a 5:44 min Video i need about 40 minutes encoding. I made  
> another test
> with Virtual Dub, the encoding time
> was there about 20 minutes.
>
> Then i tried to encode video and audio separatly with two mencoder  
> lines:
>
> mencoder -of avi -ovc xvid -ofps 25 -oac copy -mc 0 -vf
> scale,format=rgb24,scale,format=yv12,pp=lb,harddup -xvidencopts
> "threads=2:par=1/1:max_key_interval=250:nopacked:closed_gop:rc_reactio 
> n_delay_factor=16:rc_averaging_period=100:notrellis:bitrate=1500:min_i 
> quant=1:max_iquant=31:min_pquant=1:max_pquant=31:min_bquant=1:max_bqua 
> nt=31:max_bframes=2:bquant_ratio=150:bquant_offset=100:me_quality=6:lu 
> mi_mask:chroma_me:qpel:gmc:vhq=4:bvhq=1:quant_type=h263"
> -o dummy_output.avi input.avi
>
> mencoder -of avi -ovc copy -ofps 25 -oac mp3lame -srate 44100
> -audio-preload 1.5 -mc 0 -lameopts "cbr:preset=128:mode=0" -o  
> final_output
> dummy_output.avi
>
> Then the encoding time was also about 20 minutes.
>
> How is your video workflow do you also encode video and audio  
> separatly?
> Is there a way to do it without a dummyfile?
> Anybody an idea how Virtual Dub does it?
>
> I'm open to all suggestions to optimize my workflow.
>
> I have read in the mplayer doc that using "-ovc copy" makes the  
> file only
> play with mplayer correctly, i have no problem
> with VLC and media player 2 here.
>
> kind regards,
>
> tobias brockamp
>
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