Re: [FFmpeg-user] creating a grid like Zoom
Hi Michael, On Tue, May 19, 2020 at 10:25:17 -0700, Michael Glenn Williams wrote: > We tried following the examples of making grids when reading live streams > liek this: > https://www.reddit.com/r/ffmpeg/comments/aimdx9/ffserver_video_grid_source_ffserver_http_ts/ > > With the example: Using that example works fine for you, right? It does for me. (I would probably simplify the example using the "scale2ref", "hstack" and "vstack" filters, but that's not the point.) > We wrote the output into a file output.mkv for testing. However when we > playback the file it has a terrible flickering, see this output sample: > https://www.dropbox.com/s/58gj99u0ezplscw/output.mkv?dl=0 Oh, indeed. > Any thoughts on what we are doing wrong? Yes, but first: > The actual bash code is something like this: Though I can read bash, could you kindly provide us the actual resulting command line (perhaps extracted using "bash -x"), and ffmpeg's complete, uncut console output? I do have a suspicion: Your framerates (or image timings), and perhaps your resolutions, don't align very well. We may see from the output log. Perhaps we can recommend some additional options or filters to add. Cheers, Moritz ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
[FFmpeg-user] creating a grid like Zoom
Hi All,
We tried following the examples of making grids when reading live streams
liek this:
https://www.reddit.com/r/ffmpeg/comments/aimdx9/ffserver_video_grid_source_ffserver_http_ts/
With the example:
$ ffmpeg -i '
http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_30fps_normal.mp4'
-i '
http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_30fps_normal.mp4'
-i '
http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_30fps_normal.mp4'
-i '
http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_30fps_normal.mp4'
-filter_complex
"nullsrc=size=640x480[base];[0:v]scale=320x240[upperleft];[1:v]scale=320x240[upperright];[2:v]scale=320x240[lowerleft];[3:v]scale=320x240[lowerright];[base][upperleft]overlay[tmp1];[tmp1][upperright]overlay=x=320[tmp2];[tmp2][lowerleft]overlay=y=240[tmp3];[tmp3][lowerright]overlay=x=320:y=240"
-an -dn -sn -c:v "libx264" -crf "23" -preset "faster" -f "mpegts" udp://
239.0.0.1:1234
We wrote the output into a file output.mkv for testing. However when we
playback the file it has a terrible flickering, see this output sample:
https://www.dropbox.com/s/58gj99u0ezplscw/output.mkv?dl=0
Any thoughts on what we are doing wrong?
The actual bash code is something like this:
FFMPEG='ffmpeg -y'
for (( p=1; p<=$PIPES; p++ ))
do
FFMPEG="$FFMPEG -f rawvideo -video_size ${WIDTH}x${HEIGHT} -pix_fmt bgr24
-i unix://tmp/CoreFxPipe_VideoPipe$p"
done
FFMPEG="$FFMPEG -filter_complex \"nullsrc=size=${FULLWIDTH}x${FULLHEIGHT}
[background]"
LAST="background"
VY=$(($HEIGHT*-1))
for (( p=0; p<$PIPES; p++ ))
do
OFFX=$(($p%$X))
if [ $OFFX -eq 0 ]
then
VY=$(($VY+$HEIGHT+1))
fi
VX=$(($OFFX*$WIDTH))
if [ $p -eq $(($PIPES-1)) ]
then
FFMPEG="$FFMPEG [${LAST}][$p:v] overlay=shortest=1:x=$VX"
else
FFMPEG="$FFMPEG [${LAST}][$p:v] overlay=shortest=1:x=$VX [$LAST+v$p];"
fi
LAST="$LAST+v$p"
done
FFMPEG="$FFMPEG\" output.mkv &"
--
Michael Williams
CEO | CTO
Smart Blonde Experiential
8054991994
michael.glenn.willi...@smartblondeco.com
totalvu.tv
13900 Marquesas Way, Marina Del Rey, CA
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