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Video processing (FFmpeg video filters)

The RTSP filter supports some of the video filters available in FFmpeg, if they are compatible.

The FFmpeg filters are listed here.

If a given FFmpeg filter is not supported, the RTSP filter may fail to start.

To activate a given filter, invoke:

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "filter setting(s)")

or pass the filter setting at the end of the RTSP URL as follows, e.g.:

rtsp://192.168.0.24/live.sdp>videofilter=setting(s)

Vertical flipping

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "vflip")

Horizontal flipping

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "hflip")

Video rotation

Orthogonal:

transpose=dir=clock
transpose=dir=clock_flip
transpose=dir=cclock
transpose=dir=cclock_flip

E.g.:

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "transpose=dir=cclock_flip")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter=transpose=dir=clock

Any angle:

E.g. for 45°: rotate=45*PI/180

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "rotate=45*PI/180")

Hue / saturation

E.g. hue=h=90:s=1 where h = hue angle in degrees and s = saturation in the -10..10 range:

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "hue=h=90:s=1")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter=hue=h=90:s=1

Negative video

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "negate")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter=negate

Draw a box or a grid

E.g.:

drawbox=10:20:200:60:red@0.5
drawgrid=width=100:height=100:thickness=2:color=red@0.5

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "drawbox=10:20:200:60:red@0.5")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter=drawbox=10:20:200:60:red@0.5

Unsharp

E.g.:

unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5
unsharp=7:7:-2:7:7:-2

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=2.5")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter=unsharp=7:7:-2:7:7:-2

Combining several processings

Separate each processing by a comma, e.g. to combine negate and vflip:

IDatasteadRTSPSourceConfig.SetStr (RTSP_VideoStream_Filter_str, "negate,vflip")

or as URL parameter:

rtsp://192.168.0.24/live.sdp>videofilter='negate,vflip'