Recherche avancée

Sur d’autres sites (4649)

• vdpau : do not use buggy HEVC support by default

  1er juillet 2017, par wm4

  vdpau : do not use buggy HEVC support by default
  NVIDIA broke its own API when using VDPAU decoding. If you retrieve the
  
  decoded YUV data, or if you map the surfaces with GL interop, the result
  
  are interlacing artifacts. The only way to get non-broken data is by
  
  using the vdpau video mixer to convert it to RGB. There is no way to
  
  block the non-working operations in a reasonable way (a VdpVideoSurface
  
  has to support all operations).
  NVIDIA refuses to fix this issue (they "fixed" it by making it work with
  
  the video mixer, but the rest is still broken). There is no sign of that
  
  changing.
  Do not use HEVC by default with the generic hwaccle API. Detect whether
  
  it's the NVIDIA native implementation, and exit with an error. (The same
  
  thing work with the MESA implementation.)
  As an escape hatch and to allow applications to use the decoder if they
  
  really want to (perhaps because they make sure to explicitly use the
  
  video mixer), reuse AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH to disable
  
  this check.
  Once NVIDIA fixes the bug, working driver versions could be detected,
  
  and it could be allowed again.
  

  • [DH] libavcodec/vdpau.c

• Extract frames from a video (errors from using grabVideoStills and ffmpeg)

  6 juin 2023, par PBJB

  I'm attempting to extract frame-by-frame images from a set of videos. I've tried to do this using grabVideoStills and ffmpeg but I can't get either to work.

  


  Here is my grabVideoStills command :

  


    grabVideoStills(
    01_H35_combined_small.mp4,
  imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli",
  overWriteDir = FALSE,
  sampleWindow = 1
)


  


  And I get the following error :

  


      imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli",
Error: unexpected ',' in "imageDir = "C:/Users/pb/OneDrive/PD/MAG/split_stimuli","
>   overWriteDir = FALSE,
Error: unexpected ',' in "  overWriteDir = FALSE,"
>   sampleWindow = 1
> )
Error: unexpected ')' in ")"


  


  Here is my ffmpeg command :

  


  ffmpeg - i 01_H35_combined_small.mp4 %04d.png


  


  And I get the following error message :

  


  Error: unexpected numeric constant in "ffmpeg - i 01"


  


  One thought I had about this error is that it doesn't like the number at the start of the filename, I've tried using quotation marks but it yields a similar error :

  


  Error: unexpected string constant in "ffmpeg - i "01_H35_combined_small.mp4"" 


  


  Any help would be greatly appreciated !

  


• Automatically appending ffmpeg directory to path whenever exe is opened ?

  29 juin 2021, par jeb2

  I wrote a program compiled as an exe, which live on a network drive for other users to use. An issue I'm running into is that for other users (whose machines dont have python installed, not sure if this matters), it states that it can't find ffmpeg :

  


  

  


  I've placed the bin folder of ffmpeg to the same location as the exe, but its not really viable for me to manually go to each users computers to add \drive\VoiceGen\bin to their user Path. Is there a way to have the program automatically add the bin location to the userpath ?