[Ssc-dev] Redaction filter for ffmpeg.

[Andrew Senior]

Hi Shawn,
I wrote a video filter (attached file) for ffmpeg that reads a text file
with redaction regions and timing and applies the redaction to the video.
I've only tried this on my windows laptop, not inside the android client
yet.

/* Use:
 * put this file in the libavfilter directory
 * add the line
       REGISTER_FILTER (REDACT,      redact,      vf);
 * to avfilter_register_all in libavfilter/allfilters.c,
 * add
       OBJS-$(CONFIG_REDACT_FILTER)                 += vf_redact.o
 * to libavfilter/Makefile, and
       CONFIG_REDACT_FILTER=yes
 * to config.mak
 */
More "how-to" in the file

Sample command line- the parameter to the filter is just the filename of a
text file for now:
 ./ffmpeg.exe -i 'myvideo.mp4' -vf 'redact=redact_unsort.txt' -acodec copy
output.mp4

Here are a couple of sample config files:

# This is a set of coloured bars moving from left to right
# Each bar lasts for a second, overlapping for 0.5s with left and
# right neighbours.
# re-ordered to test the sorting of vf_redact
3,4,300,350,0,1000,white
0.5,1.5,50,100,0,1000,green
1.5,2.5,150,200,0,1000,blue
2,3,200,250,0,1000,cyan
3.5,4.5,350,400,0,1000,red
1,2,100,150,0,1000,yellow
4.5,5.5,450,500,0,1000,yellow
# another comment for testing
4,5,400,450,0,1000,green
2.5,3.5,250,300,0,1000,magenta
# another comment for testing
0,1,0,50,0,1000,red



0,3,50,400,50,100,pixel
2,4,150,200,100,150,pixel
3,6,150,500,200,310,pixel
1,5,100,400,150,200,red
5,9,0,70,0,80,green
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