opencv / opencv/opencv-python

can write video but the video can not be play

Open
#951 1 comment 1 reaction 0 assignees View on GitHub

Nobody has claimed this yet.

incomplete
Dominant language
Python
Stars
5.4k
Forks
1k
Avg merge
22h 17m
Merged PRs (30d)
3

Description

Expected behaviour

can write and play video with sound using opencv

Actual behaviour

can write video using opencv
but the video can not be play
using IPython.display.video()

Steps to reproduce
!wget -c http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4
pip install -U opencv-python
import numpy as np
import cv2 as cv
import IPython

cap = cv.VideoCapture('BigBuckBunny.mp4')

# Define the codec and create VideoWriter object
fourcc = cv.VideoWriter_fourcc(*'XVID')
out = cv.VideoWriter('output.avi', fourcc, 20.0, (640,  480))

while cap.isOpened():
    ret, frame = cap.read()

    if not ret:
        print("Can't receive frame (stream end?). Exiting ...")
        break

    out.write(frame)

    if cv.waitKey(1) == ord('q'):
        break

# Release everything if job is finished
cap.release()
out.release()
cv.destroyAllWindows()

IPython.display.Video('output.avi', embed = True)
  • operating system
    ubuntu jammy

  • architecture (e.g. x86)
    x86_64

  • opencv-python version
    4.9.0.80

  • screenshot
    image

Issue submission checklist
  • This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
  • I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
  • The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
  • I'm using the latest version of opencv-python

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the provided code in Google Colab with opencv-python 4.9.0.80 and IPython.display.Video, using BigBuckBunny.mp4 and the listed codecs. Determine whether the failure is specific to the pre-built package or to the Colab playback environment; done means documenting a reproducible build-toolchain issue with evidence.

Written by the indexing model from the issue text.

Assessment

Tech stack
jupyter, python
Domain
computer-vision
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
15/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.