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• ffmpeg video download shows errors in log

  15 juin 2022, par PeterM

  i'm trying to download media (video) files from sharepoint (i have view access), but during the process i get several "Connection to tcp ://xxx.xxxxx.ms:443 failed : Error number -138 occurred" or "HTTP error 503 Service Unavailable" errors (see following screenshots : tcp error HTTP error 503 )

  


  i get more errors with the following parameters :

  


  ffmpeg -i "https://theURLtoTheManifestYouCopiedHere" -codec copy downloadedVideo.mp4


  


  less errors with :

  


  ffmpeg -re -vsync 1 -i "https://theURLtoTheManifestYouCopiedHere" -codec copy downloadedVideo.mp4


  


  the options suggested in this article didn't help : https://medium.com/intrasonics/robust-continuous-audio-recording-c1948895bb49

  


  the output video is ok, but sound seems to be missing occasionally (a few seconds worth)

  


  ffmpeg version used is 2022-06-12-git-4d45f5acbd-essentials_build-www.gyan.dev (executable for windows)

  


  any advice ?

  


• how to download subtitles from a m3u8 file which is protected by cloudflare ?

  25 juin 2023, par ZombZ

  I am trying to use ffmpeg to download a vtt file from an m3u8 link but it isn't working

  


  i tried to run ffmpeg -i https://manifest-gcp-us-east1-vop1.cfcdn.mux.com/nCuL1I6vazd2gTqez6v8cW96dY6kB02KK2i008fUX5L8EjUpCcCJagIoZ2Uu01cAZFC0102nF5SzBm8M/subtitles.m3u8?cdn=cloudflare&expires=1687752000&signature=NjQ5OTBkNDBfYTExYTNkOTRlZTg1ZWU0NjUwZWUzNGFiMzFkZDgyNDFkMzU2OGU0YmExZGQzZGIyNWE5MjJkMGE3ZTdmOTM3YQ== output.vtt but it didn't work and gave me :

  


  Error when loading first segment 'https://chunk-gcp-us-east1-vop1.cfcdn.mux.com/v1/subtitle/nCuL1I6vazd2gTqez6v8cW96dY6kB02KK2i008fUX5L8EjUpCcCJagIoZ2Uu01cAZFC0102nF5SzBm8M/0.vtt?skid=default&signature=MF9lY2EwNmQxODg5OGQ5MTQxY2E1NjU2MDNiOTdkNDBhMGJjNzU1N2EwOGQ2N2E1MmE2NTI0Y2Y5MTQxNDZlYjc2'  ;https://manifest-gcp-us-east1-vop1.cfcdn.mux.com/nCuL1I6vazd2gTqez6v8cW96dY6kB02KK2i008fUX5L8EjUpCcCJagIoZ2Uu01cAZFC0102nF5SzBm8M/subtitles.m3u8?cdn=cloudflare : Invalid data found when processing input

  


• hwcontext_vulkan : rewrite upload/download

  18 juillet 2024, par Lynne

  hwcontext_vulkan : rewrite upload/download
  This commit was long overdue. The old transfer dubiously tried to
  
  merge as much code as possible, and had very little in the way
  
  of optimizations, apart from basic host-mapping.
  The new code uses buffer pools for any temporary bufflers, and
  
  handles falling back to buffer-based uploads if host-mapping fails.
  Roundtrip performance difference :
  
  ffmpeg -init_hw_device "vulkan=vk:0,debug=0,disable_multiplane=1" -f lavfi \
  
   i color=red:s=3840x2160 -vf hwupload,hwdownload,format=yuv420p -f null -
  7900XTX :
  
  Before : 224fps
  
  After : 502fps
  Ada, with proprietary drivers :
  
  Before : 29fps
  
  After : 54fps
  Alder Lake :
  
  Before : 85fps
  
  After : 108fps
  With the host-mapping codepath disabled :
  
  Before : 32fps
  
  After : 51fps
  

  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/vulkan.c