#ffmpeg on 2024-07-07 — irc logs at libera.irclog.whitequark.org

2024-04-11 19:01 BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released

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04:25 <fmlatghor> any other interesting video art tools like ffglitch you guys using?

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04:35 <ppw> hi

04:35 <ppw> does libx265 still benefit from using -movflags +faststart?

04:50 <CounterPillow> Yes, -movflags +faststart is specific to the mp4 container

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05:54 <ppw> thanks

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07:44 <{{{{{}}}}}> is there a good/simple way to do motion detection with ffmpeg or something that just reads the rtsp stream and detects objects

07:48 <Curid> You're making a VMS, with the ffmpeg CLI. dont.

07:48 <{{{{{}}}}}> Curid, i'm using mediamtx fwiw

07:48 <Curid> btw i think mediamtx can connect to the webcam directly if it supports h264

07:48 <{{{{{}}}}}> which runs ffmpeg

07:49 <{{{{{}}}}}> mediamtx can't do motion detection though

07:49 <{{{{{}}}}}> i'm trying to read the rtsp stream from it, detect motion and ideally send a push notification

07:50 <{{{{{}}}}}> ideally without training models or messing with tensorflow lol

07:50 <{{{{{}}}}}> Curid, i was just googling the topic and saw a post where you commented lol https://www.reddit.com/r/opensource/comments/10ly5lh/simple_motion_detection_for_rtsp_stream_using/

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07:51 <Curid> I think this supports notifications https://github.com/motioneye-project/motioneye

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07:53 <Curid> https://github.com/gotify/server

07:56 <Curid> ffmpeg can detect motion using the scene filter, but it's very unreliable

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08:07 <Curid> example of motion detection with multiple zones: https://pastebin.com/MiuBKV7B

08:08 <{{{{{}}}}}> sorry, got distracted by motion, i think it's working lol

08:09 <{{{{{}}}}}> i with it would highlight the motion area though

08:10 <{{{{{}}}}}> Curid, i think i like curid better tbh, your reddit comment dissuaded me from pursuing ffmpeg scene filter, it sounds complicated to setup anyways

08:11 <{{{{{}}}}}> i don't know how reliable motion is just yet but it is able to connect to mediamtx's rtsp and it is popping out detection recordings. maybe it needs some tuning

08:12 <Curid> does the camera see shadows from the sun?

08:12 <{{{{{}}}}}> yeah

08:12 <{{{{{}}}}}> it's outdoor

08:14 <Curid> I haven't found anything besides zoneminder that can do somewhat usable motion detection https://wiki.zoneminder.com/Defining_Zones

08:16 <{{{{{}}}}}> that sucks. i had commercial cams before, i think they use a neural net/dnn

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08:17 <{{{{{}}}}}> tyvm Curid !

08:17 <Curid> I have a project for object detection models if you want to go down that route https://codeberg.org/Curid/TF-CCTV

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08:28 <{{{{{}}}}}> Curid, nice, so you're developing tensorflow models in that project?

08:29 <{{{{{}}}}}> honestly, i'm only looking at out of box solutions rn. once i get this baby working I'm going to ignore it for a while and come back to it when i have more time

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08:30 <Curid> Yeah, custom tflite models optimized for cctv footage

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08:34 <Curid> Someone on reddit made a custom motion detector https://www.reddit.com/r/FOSSvideosurveillance/comments/sw0d4z/comment/hxurte0

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08:39 <solomoncyj> hi

08:39 <solomoncyj> when i was encoding a dts 5.1 ch `C L R Ls Rs LFE` audio, file using `ffmpeg `via `libopus` , i found that the resulting file did not play in vlc, due to the channel layout being rewritten to `L R C Lb Rb LFE`, whereas the original file could. however if downmixed to stereo, there would be sound. the attached link contains a copy of the song file which i reported to have no audio when encoded into opus format in 5.1 ch mode

08:39 <solomoncyj> command used: ```ffmpeg -i out.dts -c:a libopus -b:a 160k -af "channelmap=channel_layout=5.1" out.opus````

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08:42 <solomoncyj> is this a bug?

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16:51 <}8]> hi. read a bunch of posts but its a bit confusing. what i want to do is resize an embedded image in a file while keeping the aspect ratio, with the max width or height being 600, whichever is larger. ex: 1200x1000 would resize to 600x500, 1000x1200 to 500x600, and 1200x1200 to 600x600. any help accomplishing this is appreciated!

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16:54 <Curid> i think this will do it https://stackoverflow.com/a/23662884

16:58 <}8]> i think so, thanks Curid

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21:42 <}8]> if i have an audio file with 5 embedded artwork images and want to copy everything but also apply a resize to the image at index 3, how would i do that on the command line? steams are [audio, image1, image2, image3 (resize this one), image4, image4]

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22:35 <puff> Afternoon.

22:35 <puff> I'm looking at some videos in vlc and trying to figure out if they're letterboxed in the video itself or if vlc is adding the black bars above and below.

22:36 <puff> And possibly edit the video to take the black bars out.

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23:24 <}8]> looks like there may be an easy way.. how would i make this filter only apply to video where the width and/or height is greater than 600? -> scale=600:600:force_original_aspect_ratio=decrease

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