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• avcodec/vvc/vvc_ps : Check before access

  18 février 2024, par Andreas Rheinhardt

  avcodec/vvc/vvc_ps : Check before access
  max_bin_idx can be at most LMCS_MAX_BIN_SIZE - 1 here,
  
  so pivot[LCMS_MAX_BIN_SIZE + 1] may be accessed,
  
  but pivot has only LCMS_MAX_BIN_SIZE + 1 elements
  
  (unless the values of pivot were so that it is always
  
  assured that pivot[LCMS_MAX_BIN_SIZE] is always < sample
  
  (which it is iff it is always < 2^bit_depth - 1)).
  
  So reorder the checks.
  Reviewed-by : Nuo Mi <nuomi2021@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/vvc/vvc_ps.c

• Access two different webcams with same name ffmpeg dshow

  14 juin 2016, par Luke E

  I’m using ffmpeg to stream video from two webcams of the same type, and thus the same device name when selecting a dshow device with
  ’video="device name"’
  I would like to access both of them at the same time, but they seem to be indistinguishable using this approach. On https://www.ffmpeg.org/ffmpeg-devices.html#dshow I managed to find the following example code, which appears to be using some hardware id to reassign it a pin number, but for the life of me I can’t figure out how I would identify the hardware id of my webcams such as to use this example.

  ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"

  Any help is very much appreciated.

• How to access an image file using FFmpeg in a React Native (Android) / Expo project ?

  14 septembre 2021, par Asp1re

  I made an app where I want to create a video from a png using FFmpeg in React Native but I'm stuck at my image file path part. FFmpeg uses the file system of the android so I can't really use paths like ./assets/img.png. I need an absolute path - can't use require('img.png')

  


  Here is my FFmpeg code :

  


  ffmpeg -loop 1 -i img.png -t 10 -r 1 -c:v libx264 output.mp4


  


  How can I reach the res or assets folder on an android ? Is there a way to bundle it into my app so on my android I can access it through an absolute path somehow ?

  


  I searched a lot of questions similar to this and most of the answers are the use of require('img.png') but this doesn't work for me because the way FFmpeg works. Is there a way to access my image file with FFmpeg in a React Native Android project ?