error in pip dependencies

[96fps]

There seems to be an error introduced by updates to the dependencies fetched by pip install process

on running pip install wscribe (or pipx) I get the following error message:

Fatal error from pip prevented installation. Full pip output in file:
    /home/96fps/.local/state/pipx/log/cmd_2024-09-23_07.40.14_pip_errors.log

pip seemed to fail to build package:
    av==10.*

Some possibly relevant errors from pip install:
    error: subprocess-exited-with-error

Error installing wscribe.

the cited log file reads:

PIP STDOUT
----------
Collecting wscribe
  Downloading wscribe-0.1.5-py3-none-any.whl.metadata (9.2 kB)
Collecting click<9.0.0,>=8.1.6 (from wscribe)
  Downloading click-8.1.7-py3-none-any.whl.metadata (3.0 kB)
Collecting faster-whisper<0.10.0,>=0.9.0 (from wscribe)
  Downloading faster_whisper-0.9.0-py3-none-any.whl.metadata (11 kB)
Collecting structlog<24.0.0,>=23.1.0 (from wscribe)
  Downloading structlog-23.3.0-py3-none-any.whl.metadata (8.0 kB)
Collecting av==10.* (from faster-whisper<0.10.0,>=0.9.0->wscribe)
  Downloading av-10.0.0.tar.gz (2.4 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 2.4/2.4 MB 4.6 MB/s eta 0:00:00
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'error'

PIP STDERR
----------
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      pkg-config is required for building PyAV
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.