Recherche avancée

Sur d’autres sites (12064)

• How can I generate a hls.m3u8 file using a youtube URL ?

  8 avril 2021, par User0011

  I used ffmpeg in python and I was able to generate a hls file from a local mp4 file that i had on my computer, but now I want to know if there is a way to generate the hls file using a youtube URL and give this url to the input() function of ffmpeg in python ?
Here is the code I used for the first time, I want to replace test.mp4 with a youtube URL, is it possible ?
Thanks for the help

  


  import ffmpeg_streaming
from ffmpeg_streaming import Formats, Bitrate, Representation, Size


video = ffmpeg_streaming.input('/Users/test.mp4')

_480p = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
_720p = Representation(Size(1280, 720), Bitrate(2048 * 1024, 320 * 1024))

hls = video.hls(Formats.h264(), hls_list_size=10, hls_time=5)
hls.representations(_480p, _720p)
hls.fragmented_mp4()
hls.output('/Users//hls.m3u8')


  


• How to calculate the "Range" header for mp4 file to play/download a part of it ? [youtube-dl]

  5 décembre 2016, par supersan

  I’m using youtube-dl to download videos from YouTube. Unfortunately, sometimes I just need to download a part of the video like 10 seconds of a 3 hour video and here is how I see I can do it.

  Step 1 : Get the URL of the mp4 file from youtube-dl.

  youtube-dl -g -f "[ext=mp4]" https://www.youtube.com/watch?v=qOZ1u9VpoMk

  This returns $url : the full URL of mp4 file on server.

  Step 2 : Download part of the video using curl

  curl -r $startBytes-$endBytes $url

  But how to calculate $startBytes and $endBytes. What is the formula for that ?

  P.S I was thinking could be something as simple but this isn’t it..

  $startBytes = (total_size_of_video / total_length_of_video_secs) * start_seconds

  P.P.S. When I play the mp4 video in Chrome and use the scrub bar to jump around in the video, Chrome too send the Range header to the same URL (as I can see in fiddler)

• FFMPEG : Youtube streaming quality and speed issues

  25 février 2020, par Alex Paramonov

  I am trying to make a reliable stream from my Icecast/Shoutcast servers to Youtube live. The command that I use is :

  ffmpeg -v verbose -framerate 30 -loop 1 -i /var/image.jpg -re -i http://127.0.0.1:4700/radio -c:v libx264 -preset ultrafast -b:v 2250k -maxrate 6000k -bufsize 6000k -c:a copy -ab 128k -s 1920x1080 -framerate 30 -g 60 -keyint_min 60 -f flv  rtmp://a.rtmp.youtube.com/live2/xxx

  As you can see I am using recommended bitrate for Youtube, insert keyframes every 2 seconds and streaming at 30 frames per second.
  The stream is working but after running for some time two thing are happening :

  1. FFMPEG speed falls from 1x to something like 0.998x
  2. Youtube starts complaining that video stream speed is slow, markes the quality as bad and sometimes video starts buffering.

  Why is this happening ? CPU load is normal, connectivity is ok (the stream is running on a 1Gg/s dedicated server).

  Since in my example above I am streaming a single image as a logo of the stream I also tried to generate a short 30 seconds video with that image and broadcast that video instead of an image, but that did not help as well.

  The command I used for conversion :

  ffmpeg -framerate 30 -loop 1 -i /var/image.jpg -c:v libx264 -preset ultrafast -tune stillimage  -b:v 2250k -minrate 2250k -maxrate 6000k -bufsize 6000k -framerate 30 -g 60 -keyint_min 60 -t 30 out4.mp4

  And broadcast with

  ffmpeg -stream_loop -1 -i out4.mp4  -re -i http://127.0.0.1:4700/radio -c:v copy -c:a copy  -framerate 30 -g 60 -keyint_min 60 -f flv  rtmp://a.rtmp.youtube.com/live2/xxx

  ffmpeg version is 4.1.1