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• Play video using HTML5 video tag

  21 janvier 2014, par user3217695

  Hi i need to display video in all the browsers using html5.

  I am uploading the file and creating html structure and it plays only mp4 format video, but not other uploaded formats, and i use command line to convert files but the converted files doesn't play in video tag.

  For conversion I use ffmpeg video conversion from one to webm format. Conversion works, but viedos don't play.

  Please find me ffmpeg code, which converts all videos to webm, so i can play the converted video using html5.

• How to play video file with audio with DearPyGUI (Python) ?

  1er mars 2023, par Vi Tiet

  I'm using DearPyGUI to make a simple media player that can play video file (mp4, etc.) together with it's audio. The pre-requisite is that DearPyGUI is a must, however video feature will not exist until v2.0, which is still far in the future.

  


  Currently, I can only render the frames using OpenCV library for Python, however, the problem is how can I play the audio as well as play it in sync with the output video frames ?

  


  For context, I'm quite new to Python, and I don't know much about video and audio streaming, but I've thought of some approaches to this problem by looking through help posts online (However, I still have no idea how I can implement any of these seamlessly) :

  


  


  1. OpenCV for video frames, and audio ??? some libraries like ffmpeg-python or miniaudio to play sound... (How...?)

     


  


  2. Extract video frames and audio here and then use the raw data to play it (How...?)

     


  


  3. This example here is pretty close to what I want excluding the playing video and audio part, but I have no idea where to go from there. The video stream and the audio stream are instances of ffmpeg.nodes.FilterableStream, and they appear to hold addresses to somewhere. (No idea...)

     


  


  4. Another very close idea is using ffpyplayer I was able to get the video frame. However, the below code yields a blueish purple color tint to the video, and the frame rate is very slow compared to original (So close...)

     


  


  


  import time
import numpy as np
import cv2 as cv
from ffpyplayer.player import MediaPlayer


# https://github.com/Kazuhito00/Image-Processing-Node-Editor/blob/main/node_editor/util.py 
def cv2dpg(frame): 

    data = cv.resize(frame, (VIDEO_WIDTH, VIDEO_HEIGHT))
    data = np.flip(frame, 2)
    data = data.ravel()
    data = np.asfarray(data, dtype=np.float32)

    return np.true_divide(data, 255.0)


# https://stackoverflow.com/questions/59611075/how-would-i-go-about-playing-a-video-stream-with-ffpyplayer
# https://matham.github.io/ffpyplayer/examples.html#examples
def play_video(loaded_file_path):

    global player, is_playing
    player = MediaPlayer(loaded_file_path)

    while is_playing:

        frame, val = player.get_frame()

        if val == 'eof':
            is_playing = False
            break

        elif not frame:
            time.sleep(0.01)

        elif val != 'eof' and frame is not None:
            img, t = frame
            w = img.get_size()[0]
            h = img.get_size()[1]
            cv_mat = np.uint8(np.asarray(list(img.to_bytearray()[0])).reshape((h, w, 3)))
            texture_data = cv2dpg(cv_mat)
            dpg.set_value(VIDEO_CANVAS_TAG, texture_data)

    dpg.set_value(VIDEO_CANVAS_TAG, DEFAULT_VIDEO_TEXTURE)


  


  I still need to do more research, but any pointer to somewhere good to start off (either handling raw data or using different libraries) would be greatly appreciated !

  


  EDIT :
For more context, I'm using raw texture like this example of DearPyGUI official documentation to render the video frames that were extracted in the while loop.

  


• FFMPEG libx264 mp4 file does not play in firefox Windows

  2 mai 2020, par Behel

  Some of my ffmpeg converted videos in mp4 format, using libx264 encoder, aren't playable with Firefox browser on Windows.

  



  Here is my ffmpeg command : 
ffmpeg -i file_tmp.mp4 -c:v libx264 -profile:v baseline -level 3.0 -crf 15 -preset slow -pix_fmt yuv420p -c:a aac -movflags faststart -strict -2 -vf scale=1024:576 file.mp4

  



  The video can be played with every browsers on Mac, and works well with Webkit based browers on Windows.

  



  The problem not occur with every video converted, only a few, like this one for instance : https://attentionphilippelepara.pet/testcard/m6-29_04_2020-mire.mp4

  



  Here is what I see when i try to play this media, on Firefow Windows then on Chrome Windows.

  



  

  



  I really don't see where is the problem. Can someone could help me ?