Missing timestamp information for DVR frames

Overview

Missing timestamp informations when decoding a DVR. The DVR is OK. I extracted the timestamp info with other tools but not with this library.

Expected behavior

I would expect dts, pts or time to be other than None since the DVR encode timestamp info.

Actual behavior

dts, pts and time values for the frame object are none

Reproduction

  container = av.open(dvr_path)

  for frame in container.decode(video=0):
      print(frame.time)

Versions

Tried on Linux and MacOS:

• OS: Ubuntu 20.04 (pipenv) / Ventura 13.2.1 (conda)
• PyAV runtime:

PyAV v9.1.0 (Mac)
v10.0.0 (Ubuntu)

• FFmpeg:

ffmpeg version 4.3.2 (Mac) 
ffmpeg version 4.2.7 (Ubuntu)