> On Mar 8, 2022, at 11:02 AM, Steven Kan <ste...@kan.org> wrote: > > >> On Mar 8, 2022, at 10:32 AM, Michael Koch <astroelectro...@t-online.de> >> wrote: >> >> Am 08.03.2022 um 19:09 schrieb Steven Kan: >>> After 7.5 years of waiting, my banana plant is finally flowering! I want to >>> do a time-lapse capture of the flowering and fruiting process. Due to its >>> location, the easiest way for me to get a camera out there is to use a >>> little WyzeCam v3 with the RTSP firmware and the Wyze lamp socket. >>> Unfortunately the WyzeCam doesn’t (yet) have a externally accessible JPG >>> snapshot feature, so I have a cron job set up to: >>> >>> ./ffmpeg -rtsp_transport tcp -i rtsp://anonymous:password@$IPAddress/live >>> -frames:v 1 $outfile >>> >>> every hour. The results are OK, but not fantastic: >>> >>> https://www.kan.org/pictures/BananaTimeLapseFirstImage.jpg >>> <https://www.kan.org/pictures/BananaTimeLapseFirstImage.jpg> >>> >>> Is there a way to tell ffmpeg to collect N frames of video and output one >>> single averaged image to improve the SNR? Even if there’s some wind, the >>> flower stalk shouldn’t be moving much. >>> >>> I tried: >>> >>> ./ffmpeg -rtsp_transport tcp -i rtsp://anonymous:password@192.168.1.39/live >>> -frames:v 10 ~/BananaLapse/MultiFrame%03d.jpg >>> >>> and that results in N JPGs. I suppose I could have a second ffmpeg command >>> that averages those 10 JPGs, but can this all be done in one pass? Thanks! >> >> You can use the "tmix" filter before you extract the images from the video. >> >> Michael > > Thanks! Can I get a little help on the syntax? Right now it’s still expecting > to output multiple images: > > ./ffmpeg -rtsp_transport tcp -i rtsp://anonymous:password@192.168.1.39/live > -frames:v 10 -vf tmix=frames=10:weights="1" ~/BananaLapse/MultiFrame.jpg
Ah, I think I figured it out. This works: ./ffmpeg -rtsp_transport tcp -i rtsp://anonymous:password@192.168.1.39/live -vf tmix=frames=10:weights="1" -frames:v 1 ~/BananaLapse/MultiFrame.jpg I now have the -vf first, which averages 10 frames into 1, and then -frames:v expects only 1, correct? The output appears to be what I expect, with various values of N: https://www.kan.org/pictures/MultiFrame1.jpg <https://www.kan.org/pictures/MultiFrame1.jpg> https://www.kan.org/pictures/MultiFrame10.jpg <https://www.kan.org/pictures/MultiFrame10.jpg> https://www.kan.org/pictures/MultiFrame128.jpg <https://www.kan.org/pictures/MultiFrame128.jpg> And after all that I’m not sure it improves the image that much. I’ll check again at night, when the SNR will get worse. Thanks for the help! _______________________________________________ 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".
