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• My Raspberry pi doesnt capture frames even though pi cam is detected in index 0

  1er mars 2024, par Yassine Benkhalouk

  I'm using Raspberry Pi 4 Model B with Pi camera module v3, I'm trying to launch an RTSP stream server that streams camera feed, I've been using this RTSP library, when I run the server script :

  


  import cv2
from zephyr import Stream

if __name__ == "__main__":
  stream = Stream(
    url="rtsp://localhost:8554/test",
    resolution=(1280, 720),
    fps=30,
    bitrate="2M"
  )

  cap = cv2.VideoCapture(0)
  while True:
    ret, frame = cap.read()
    stream.send(frame)


  


  I get :

  


  Traceback (most recent call last):&#xA;  File "/home/pi/testserver1.py", line 15, in <module>&#xA;    stream.send(frame)&#xA;  File "/home/pi/innov/venv/lib/python3.11/site-packages/zephyr/stream/stream.py", line 174, in send&#xA;    frame = cv2.resize(frame, self.resolution)&#xA;            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^&#xA;cv2.error: OpenCV(4.8.1) /io/opencv/modules/imgproc/src/resize.cpp:4062: error: (-215:Assertion failed) !ssize.empty() in function &#x27;resize&#x27;&#xA;</module>

  


  even though my camera is detected :

  


  (venv) pi@YassinePi:~ $ libcamera-still --list-cameras
Available cameras
-----------------
0 : imx708 [4608x2592 10-bit RGGB] (/base/soc/i2c0mux/i2c@1/imx708@1a)
    Modes: 'SRGGB10_CSI2P' : 1536x864 [120.13 fps - (768, 432)/3072x1728 crop]
                             2304x1296 [56.03 fps - (0, 0)/4608x2592 crop]
                             4608x2592 [14.35 fps - (0, 0)/4608x2592 crop]


  


  I've tried changing the index from 1,-1,2 didn't work

  


  I think it may be because this code is designed for desktop computers, or I didn't install the required packages correctly

  


  For the second reason since I don't have experience with Raspbian OS, I reinstalled the OS and installed the packages all over again, still doesn't work.

  


  Any idea how to solve this issue ? Or there is an alternative way to do this ?

  


• Audio effect ( a 20ms delay between right and the left channel) using Web Audio API or any Javascript Audio Library like howler.js, tone.js ?

  15 juillet 2020, par questionare_101

  I was wondering if there any option in howler.js, tone.js or any other javascript audio library which I can use to add a 20ms delay between the right and the left channel which makes the audio listening experience more immersive.

  


  Can it be achieved using Audio sprites with howler.js ? (but I guess it can't separate the right and the left channels)
https://medium.com/game-development-stuff/how-to-create-audiosprites-to-use-with-howler-js-beed5d006ac1

  


  Is there any ?

  


  Have also asked the same quest here : https://github.com/goldfire/howler.js/issues/1374

  


  I usually enable this option under ffdshow audio processor while playing audio using MPC-HC (Mega Version) on my pc. I was wondering how can I do it using Web Audio API or howler.js ?

  


  

  


  Somewhat like this kind of effect : Just delay the either channel by 20ms
Like we do in Adobe Audition


  


• avformat/mp3dec : Subtract known padding from duration

  22 août 2023, par Ulrik Mikaelsson

  avformat/mp3dec : Subtract known padding from duration
  When an Info-tag is present, marking initial and trailing samples as
  
  padding, those samples should not be included in the calculation of track
  
  duration.
  This solves a surprising user experience where converting a WAV->MP3->WAV,
  
  ffprobe will show the duration of the mp3 as slightly longer than both the
  
  input and the output.
  As a result, the estimated duration and imprecise seek-results of some
  
  FATE-tests have been updated.
  

  • [DH] libavformat/mp3dec.c
  • [DH] tests/ref/fate/gapless-mp3-side-data
  • [DH] tests/ref/seek/extra-mp3