[MPlayer-dvb] Better picture for mplayer-dvb

[Sebastian Kemper]

Nico Sabbi schrieb:
> Sebastian Kemper wrote:
> 
>> Hello list,
>>
>> yesterday I tried different postprocessing filters on my dvb. I think 
>> I read all posts to this list concerning blockiness, the dvb card not 
>> liking bitrates higher then 5000 etc. In the beginning I thought my 
>> VDR was too slow for say lavc=2 (AMD 1700+), but after writing the 
>> mpegpes to disk an then replaying it the dvb still refused to play the 
>> movie fluently. So I think there's a bitrate barrier on the dvb card.
> 
> 
> Can you explain how your computer is configured and what you are trying 
> to do exactly?
> Do you have a FF or a budget card? Maybe FF have such a bitrate barrier, 
> but imo it's unlikely.
> 
I got a FF rev.1.5. The mobo is an NForce2.
>>
>> I think it should be possible to even get a good picture with 
>> lavc=5000 if one uses postprocessing. But I didn't find the "cure" 
>> yet. Two things: I'm not sure which postprocessing filter(s) to use 
>> and where to place them in the -vop (respectfully -vf) list.
>>
>> Until now I tried different combinations with pp=hb:a/vb:a/dr and 
>> changing the decoder to xvid using -xvidopts 
>> deblock-chroma:deblock-luma[:dr2]. Also I tried to change the 
>> sharpness of the bicubic scaler.
>> I placed the changes in mplayer.sh:
>>
>>
> 
> what does xvid have to do with all this? I'm more and more confused
By default XVID gets decoded by ffmpeg (have a look into codecs.conf). I 
used the xvid codec to decompress to see if the picture gets better 
because my vids are mostly xvid. But it didn't change the picture as far 
as I could see,
> 
>>
>> -vop 
>> pp=hb:a/vb:a/dr,$VOP:$NEW_FPS,expand=$NEW_X:$REAL_Y:-1:-1:1,scale=$NEW_X:${NEW_Y}:0:0:100 
>>
>>
>> -vop 
>> $VOP:$NEW_FPS,pp=hb:a/vb:a/dr,expand=$NEW_X:$REAL_Y:-1:-1:1,scale=$NEW_X:${NEW_Y}:0:0:100 
>>
>>
>> -vop -xvidopts deblock-chroma:deblock-luma[:dr2] 
>> $VOP:$NEW_FPS,expand=$NEW_X:$REAL_Y:-1:-1:1,scale=$NEW_X:${NEW_Y}:0:0:100
>>
>> I think my VDR was too slow for the xvid codecs internal 
>> postprocessing :)
>>
>> The problem is I don't really know which position in the -vop list 
>> (for pp=...) is the best. I read about postprocessing being placed 
>> best before YUV conversion. But I'm not sure what that is :) Maybe you 
>> can tell me where to place these options.
> 
> 
> 
> This is a question for mplayer-users.
Allthough I tried different positions in the -vop list none seemed to 
have any effect on the TV output. The only thing that seems to change 
the quality is playing with lavc=... But as I mentioned earlier there 
seems to be a boundary (skips occur).
> 
>>
>> Another thing is, my friend still got a Windows system, a P3 700MHz, 
>> and when he plays DivX on his computer (on a normal monitor, no dvb 
>> hardware) the picture looks awesome: No blocks and, allthough he's got 
>> "slower" hardware, it never skips. On my laptop the picture isn't that 
>> perfect with mplayer. I don't have skips because it's a Pentium-M with 
>> 1.4GHz and I use -vo xv, but it's far more blocky. My friend uses VLC 
>> on his Windows system btw.
>> I think having a postprocessing filter like that could even help with 
>> mplayer-dvb (before lavc=5000?), but I didn't find an equivalent yet. 
>> Are the same filters available for mplayer as they are for a Windows 
>> VLC? Where would you place postprocessing filter in the -vop list?
>>
>> Thanks!
>>
>> Sebastian
> 
> 
> 
> The major difference I can think of is that mplayer by default decodes 
> mpeg12 with libmpeg2, vlc with lavc.
> Use -vc ffmpeg12, to change behavior
I'm not decoding MPEG2. I'm decoding DivX. :)

Laters

Sebastian

> 
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