Re: [MPlayer-users] reducing size of files while conserving theaudio/video quality

[LGW <large@xxxxxxxxxxxxxx>]

[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
if you are using gnome (or even if not), you might want to try the 
gmencoder frontend. It's really a great tool, you can crop with preview, 
setup all (I think) parameters that mencoder has, and it's easy to use. 
Great think to gamble with parameters. And it does 3-pass out of the box.

I used far more low bitrates with lacv, like 360. Of course you get 
kindof ugly results, but the files get really small :)

It depends on the result size and quality you expect, I think. You might 
want to scale the image size down (for 360kbit I used 320*240). Of 
course, this is really low quality, than.

I also suggest to use -lavcopts vhq:.... to set him to maximum encoding 
quality. It won't take much longer to encode, but with better results.

The encoding parameters for a good result depend much on file size and 
movie (southpark will be totally different than jackass), so you'll have 
to try it out.

good luck,
 Lars

Maximo Ramos wrote:

> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi there!!
>
> I am running out of hard disk, and having a bunch of music videos, as well as
> many episodes of TV series (southpark, jackass), most of them in MPEG format,
> I've decided to reencode them to gain hard disk space.
>
> However, I am very new at this, and after reading encoding.html and 
> encoding-tips.txt I still can't decide what options to use, like vbitrate for
> example.
>
> I tried the following:
>
> South_Park_S07E06_Lil_Crime_Stoppers.proper-ftv.ShareReactor.mpg is 219MB in
> MPEG format.
>
> ID_VIDEO_FORMAT=0x10000001
> ID_VIDEO_BITRATE=1150000
> ID_VIDEO_WIDTH=352
> ID_VIDEO_HEIGHT=240
> ID_VIDEO_FPS=29.970
> ID_VIDEO_ASPECT=1.3333
> ID_AUDIO_CODEC=mp3
> ID_AUDIO_FORMAT=80
> ID_AUDIO_BITRATE=224000
> ID_AUDIO_RATE=44100
> ID_AUDIO_NCH=2
> ID_LENGTH=1596
>
> MY TEST:
>
> mencoder South_Park.mpg -ovc frameno -oac mp3lame -lameopts br=3 -o frameno.avi
> mencoder South_Park.mpg -oac copy -ovc lavc -lavcopts 
> vcodec=mpeg4:vpass=1:vbitrate=800:autoaspect:vqmin=3:mbd=1
> mencoder South_Park.mpg -oac copy -ovc lavc -lavcopts 
> vcodec=mpeg4:vpass=2:vbitrate=800:autoaspect:vqmin=3:mbd=1
>
> The resulting file is 89MB and:
>
> ID_VIDEO_FORMAT=DIVX
> ID_VIDEO_BITRATE=397344
> ID_VIDEO_WIDTH=352
> ID_VIDEO_HEIGHT=240
> ID_VIDEO_FPS=29.970
> ID_VIDEO_ASPECT=0.0000
> ID_AUDIO_CODEC=mp3
> ID_AUDIO_FORMAT=85
> ID_AUDIO_BITRATE=160000
> ID_AUDIO_RATE=44100
> ID_AUDIO_NCH=2
> ID_LENGTH=1314
>
> I choosed vbitrate 800 because according with the man page that's the minimum, 
> but I am not sure what vbitrate to use in order to preserve the audio and video
> quality.
>
> I am going to reencode all my files soon, so If somebody was in the same situation
> and have found the best options for lameopts and lavcopts, please share your 
> thoughts :)
>
> Thanks!
>
>  


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