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• Decoding h.264 in node.js without ffmpeg and send it to front or save it in fs

  5 mars 2019, par JT.v26

  I’m doing the final project of a bootcamp.

  The project consists of controlling a drone (Tello) with a mobile phone. So for this project I’m using react native. In which I insert a node.js inside the application (Node.js for Mobile Apps React Native) since the drone creates a wifi and I lose internet access to connect to a remote server.

  All right so far, the drone has three udp ports enabled on the sdk to receive instructions, send status and send video.
  The video gives it to me in raw.

  I did a test on the computer, downloading ffmpeg and converting that data and I could effectively have the video retransmission.

  My questions are :

  Is there any way I can use the same technique on the mobile without needing ffmpeg ?

  Is there any way to import ffmpeg into android and communicate with nodejs ?

  Is there any other solution where I can use another node that doesn’t have to be on the phone ?

  Or you may even find some other solution to address this problem.

  Thank you very much in advance

• arm : vp9itxfm : Avoid .irp when it doesn’t save any lines

  4 février 2017, par Martin Storsjö

  arm : vp9itxfm : Avoid .irp when it doesn’t save any lines
  This makes it more readable.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavcodec/arm/vp9itxfm_neon.S

• Record screen and save to .mp4 video

  10 avril 2023, par Freddy J

  I have created an animation in Pyglet and I want to save this animation as a video retaining the same quality as the Pyglet window. I attempt to use imageio and FFMPEG with Pyglet. See relevant snippets below.

  


  import numpy as np
import pyglet
import imageio.v2 as iio

writer = iio.get_writer("out.mp4")

@window.event
def on_draw():
    # Draw
    # ...

    # Capture frame
    color_buffer = pyglet.image.get_buffer_manager().get_color_buffer()
    image_data = buffer.get_image_data()
    buffer = image_data.get_data("RGBA", image_data.pitch)

    # 4 channels: RGBA
    frame = np.frombuffer(buffer).reshape((image_data.height, image_data.width, 4))
    writer.append_data(frame)


  


  Problem :

  


  buffer has expected size of window width * window height * 4.
  
However, np.frombuffer(buffer) has size buffer size / 8. I do not know why. I expect the size to be equal. Hence, the program fails at the reshape step.