pyav15.0 reuses input stream as template, time base is not copied to output stream

[ncheng89]

Reusing the input stream as a template for the output stream does not seem to copy the time base of the input stream to the output stream as a base

import av

INPUT_URL = "rtsp://abc:[email protected]:554/Streaming/Channels/101"

in_container = av.open(INPUT_URL, options={"rtsp_transport": "tcp", "timeout": "5000000"})
video_stream = in_container.streams.video[0]

print("Input stream time_base:", video_stream.time_base)

out_container = av.open("test_output.mp4", mode="w")

out_stream = out_container.add_stream_from_template(video_stream)

print("Output stream time_base (default):", out_stream.time_base)

out_stream.time_base = video_stream.time_base
print("Output stream time_base (after fix):", out_stream.time_base)

out_container.close()
in_container.close()

Output log

Input stream time_base: 1/90000
Output stream time_base (default): None
Output stream time_base (after fix): 1/90000