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• vulkan_h264 : send scaling lists in zig-zag order

  21 août 2023, par Benjamin Cheng

  vulkan_h264 : send scaling lists in zig-zag order
  h264_ps turns the scaling lists into matrices with a raster scan order,
  
  but Vulkan wants the scaling lists as originally defined.
  

  • [DH] libavcodec/vulkan_h264.c

• 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)

• Python code to download hls stream to mp4

  2 décembre 2024, par Maad A.Galil

  I wrote the following code to download a video from a website. Chrome extensions can detect the video and download it. However, my code gets the following errors. Any help ?

  


  from bs4 import BeautifulSoup
import requests
from subprocess import check_output

video_url = 'https://www.dimakids.com/ab6al-aldigetal-s3-1415387355-21011.html#sets'
headers = {'User-Agent': 'Mozilla/5.0'}

url = requests.get(video_url, headers=headers)
page = url.content
soup = BeautifulSoup(page, "html.parser")

result = str(soup.find_all('video')[0])
result = result.split('src="')[1].split('" type=')[0] 
print(result)

# seg = requests.get(result)
# """
# Error: requests.exceptions.SSLError: HTTPSConnectionPool(host='stream.foupix.com', port=443): Max retries exceeded with url: /animeios/1415387355/ab6al_aldigetal_s3_01.mp4/index.m3u8?tkn=jja4Czj-AzbJx1JmvDvQeA&tms=1733079050 (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')))
# """
# print(seg)


print(check_output(f'ffmpeg -i "{result}" -codec copy file.mp4', shell=True))
"""
Error: https://stream.foupix.com/animeios/1415387355/ab6al_aldigetal_s3_01.mp4/index.m3u8?tkn=SWf7n3qH8MwFLlq18wngIQ&tms=1733079103: Server returned 403 Forbidden (access denied)
"""


  


  The link works as any hls downloader can capture the video and download it as seen here (of course token and timestamp values change everytime it captures the video) :

  


  Page URL https://www.dimakids.com/ab6al-aldigetal-s3-1415387355-21011.html#sets

  


  Thumbnail https://www.dimakids.com/images/anime/cat_1415387355.jpg

  


  main url https://stream.foupix.com/animeios/1415387355/ab6al_aldigetal_s3_01.mp4/index.m3u8?tkn=6nyEskSbHBI713sG0uhZJQ&tms=1733171604

  


  video component https://stream.foupix.com/animeios/1415387355/ab6al_aldigetal_s3_01.mp4/index.m3u8?tkn=6nyEskSbHBI713sG0uhZJQ&tms=1733171604