[MPlayer-dev-eng] [PATCH] shared memory stream - part 1
Ötvös Attila
oattila at chello.hu
Wed Aug 8 13:56:14 CEST 2007
2007. augusztus 8. 10.34 dátummal Nico Sabbi ezt írta:
Hi Nico Sabbi!
> the idea is good, but there some hacks that I don't like:
> - the introduction of -ors shouldn't be needed, because
> the out-stream that you rightfully used should recognize
> the smsm:// stream prefix automatically
> - I would send to the output stream a full multiplex
> of audio+video or video alone, thus there would not
> be any need to force output demuxer_type, width, height
> - once done this the only thing you need to do is to implementing
> a stream reader and writer leaving alone all the rest
>
> In summary you would use something like:
>
> mencoder tv:// -tv device=/dev/video0 -ovc raw smem://1000 [options]
> mencoder tv:// -tv device=/dev/video1 -ovc raw smem://1001 [options]
> mplayer smem://1000,1001,1002,1003 -vf tile=2:2
>
I make sharedmem to CCTV. The sharedmem support video alone. The mencoders
record video from cameras to avi files and shared video with sharedmem:
mencoder tv:// -tv device=/dev/video0 -o cam1.avi -ors
smem://1000 -nosound -ovc lavc -lavcopts vcodec=mpeg4 [options]
mencoder tv:// -tv device=/dev/video1 -o cam2.avi -ors
smem://1001 -nosound -ovc lavc -lavcopts vcodec=mpeg4 [options]
...
The mplayer show picture of cameras from sharedmem:
mplayer smem://1000,1001,1002,1003 -vf tile=2:2
I think need width, height, etc. therefore there is not header in rawvideo:
Memory structure in sharedmem:
+typedef struct smem_st {
header:
+ char mplayerid[2];
+ int type;
+ int size;
+ int demuxer_type;
+ int format;
+ int width;
+ int height;
+ float pts;
rawvideo data:
+ unsigned char data[0];
+} smem_t;
Best regard.
Attila
More information about the MPlayer-dev-eng
mailing list