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Demo video-capture width and height must be divisible by 2 #472

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6e7c683
Update video-capture.py
sjoerdsmink Feb 6, 2026
eafa018
Update video-capture-simple.py
sjoerdsmink Feb 6, 2026
d064dc9
More common syntax
sjoerdsmink Feb 6, 2026
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6 changes: 4 additions & 2 deletions demos/video-capture-simple.py
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Expand Up @@ -76,8 +76,10 @@ def main() -> None:
# the video, as well as possibly audio and more. These are each called "streams". We only create one
# stream here, since we're just recording video.
video_stream = avmux.add_stream(CODEC, rate=FPS, options=CODEC_OPTIONS)
video_stream.width = monitor["width"]
video_stream.height = monitor["height"]
# Width and height must be divisible by 2, otherwise the encoder will fail.
# Round down to the nearest even number.
video_stream.width = monitor["width"] // 2 * 2
video_stream.height = monitor["height"] // 2 * 2
# There are more options you can set on the video stream; the full demo uses some of those.

# Count how many frames we're capturing, so we can log the FPS later.
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6 changes: 4 additions & 2 deletions demos/video-capture.py
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Expand Up @@ -476,8 +476,10 @@ def main() -> None:
# so some video encoders will tag it as AVCOL_TRC_BT709 (1) instead.
video_stream.color_trc = 13

video_stream.width = monitor["width"]
video_stream.height = monitor["height"]
# Width and height must be divisible by 2, otherwise the encoder will fail.
# Round down to the nearest even number.
video_stream.width = monitor["width"] // 2 * 2
video_stream.height = monitor["height"] // 2 * 2
# There are multiple time bases in play (stream, codec context, per-frame). Depending on the container
# and codec, some of these might be ignored or overridden. We set the desired time base consistently
# everywhere, so that the saved timestamps are correct regardless of what format we're saving to.
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