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• Live streaming from FFMPEG : output a window m3u8 and also an all-segments m3u8

  1er décembre 2022, par coder_uk

  I've been experimenting with using FFMPEG to take an incoming RTMP stream, transcode into a selection of bitrates, and output it as HLS. It works.

  


  I wanted to store the live stream as a VOD. And found by adding the -hls_list_size 0 flag, sure enough, all segment are in the .m3u8. Making it super easy to turn into a VOD afterwards. So far, so good.

  


  But the obvious consequence of using -hls_list_size 0 is that now the m3u8 is huge during the live stream. That's fine for a VOD where it is only requested once, but less good during a live stream where it is requested over and over.

  


  So ... my question : without re-transcoding, can FFMPEG output both an all-segments all.m3u8 (to keep internally for making a VOD afterwards, ie using -hls_list_size 0) and also output a sliding-window style latest.m3u8 (of only the last X segments, ie using -hls_list_size 3) ?

  


  That way, viewers of the live stream could be served that little latest.m3u8, as a tiny file, with only the last few segments in. And after the event ends, I'd ditch that little latest.m3u8 and only keep the all.m3u8 to make a VOD version of the stream ?

  


  Thanks !

  


• MoviePy does not save anything anywhere. But also no error

  27 mai 2023, par Paul Spieker

  I tried running simple moviepy code. It does not save anything. Exit code 0. No error message. No sucessfully saved print. I have the newest version of moviepy and ffmpeg. Doesnt work with or without specifying an output directory. I am on windows 10, working in PyCharm with Python 3.9 . I am super new to coding if it isnt obvious, thankful for any help !! Here is the code I used :

  


  from moviepy.editor import VideoClip
from moviepy.video.io.ffmpeg_writer import FFMPEG_VideoWriter




    w, h = 640, 480
    red = int(255 * t)
    green = int(255 * (1 - t))
    blue = 0
    frame = np.zeros((h, w, 3), dtype=np.uint8)
    frame[:, :, 0] = red
    frame[:, :, 1] = green
    frame[:, :, 2] = blue
    return frame


duration = 5  # in seconds
fps = 30
width, height = 640, 480
video_clip = VideoClip(make_frame, duration=duration)


output_path = "output.mp4"


video_clip.write_videofile(output_path, fps=fps, codec='libx264')

print("File saved successfully!")


  


  I was expecting to get any file saved at all. Nothing shows up in my folder. I have double checked MoviePy and ffmpeg as stated.

  


• FFMPEG re-broadcast/proxy MJPEG stream

  10 septembre 2022, par Ollie Pugh

  I have an MJPEG stream coming from an RPI on my home network and have an NGINX acting as a proxy on an EC2.

  


  For the camera access the flow of stream to the user is the following

  


  RPi -> mjpeg-proxy (running on EC2) -> NGINX (running on same EC2) -> user

  


  the point of mjpeg-proxy is to reduce the load on the RPi and only have one stream to the Pi and allow the EC2 to distribute that one stream.

  


  Now this work fine-ish from my PC (on same network as Pi) the streams work perfectly. But when it comes to my phone on roaming data, the stream is super choppy and the latency grows massively (this project needs minimal latency, like sub 300ms).

  


  I can't understand why this would happen ? Because even when running of my local PC its going through the Proxy hosted in the cloud, so its not as if its an advantage to it being local ?

  


  the stream is fine on another device, e.g. my laptop, but thats on the same network as the RPi. But like I said, it shouldn't makea difference as its going through a proxy !

  


  I was wondering if using FFMPEG to re-stream the mjpeg stream would be beneficial as node is notoriously slow. But I don't really want to be writing my own mjpeg-proxy in C++ to speed this all up.

  


  I have looked online for answers to FFMPEG MJPEG proxy and have been very unsuccesful