5.x Linux wheels still cannot decode AV1: 5.0.0.93 predates the dav1d fix (#1209), please release a 5.x build
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评估
调研方向
Start by comparing the 5.x release state with the merged fix in #1209, especially commit 314eb3d2 and the wheel build configuration. Check how the 4.x wheels were published with dav1d. Done means a 5.x wheel includes the fix and passes the supplied AV1 and H.264 reproduction.
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描述
Summary
The Linux AV1 decoding fix from #1209 (which closed #908) is merged into both 4.x and 5.x, but it has only been released on the 4.x line. The newest 5.x wheel on PyPI, 5.0.0.93 (uploaded 2026-07-02), predates the merge (2026-07-27, 314eb3d2), so 5.x users on Linux still cannot read any AV1 video.
Could a 5.x wheel be published that includes the dav1d build from #1209?
Reproduction
Linux x86_64, Python 3.12, wheels from PyPI. Test files made with FFmpeg 8.1:
ffmpeg -f lavfi -i testsrc2=s=640x360:r=25:d=2 -c:v libsvtav1 -pix_fmt yuv420p av1-8bit.mp4
ffmpeg -f lavfi -i testsrc2=s=640x360:r=25:d=2 -c:v libsvtav1 -pix_fmt yuv420p10le av1-10bit.mp4
ffmpeg -f lavfi -i testsrc2=s=640x360:r=25:d=2 -c:v libx264 -pix_fmt yuv420p h264.mp4
import cv2
for f in ["av1-8bit.mp4", "av1-10bit.mp4", "h264.mp4"]:
cap = cv2.VideoCapture(f, cv2.CAP_FFMPEG)
print(f, "opened:", cap.isOpened(), "read:", cap.read()[0])
| Wheel | av1-8bit.mp4 |
av1-10bit.mp4 |
h264.mp4 |
|---|---|---|---|
opencv-python-headless==4.14.0.94 |
read: True | read: True | read: True |
opencv-python-headless==5.0.0.93 |
read: False | read: False | read: True |
(opencv-python==5.0.0.93 behaves the same as the headless wheel.)
With 5.0.0.93, isOpened() returns True, so the failure is silent apart from the FFmpeg log:
[av1 @ 0x...] Your platform doesn't support hardware accelerated AV1 decoding.
[av1 @ 0x...] Failed to get pixel format.
[av1 @ 0x...] Get current frame error
Diagnosis
Querying the libavcodec bundled in the 5.0.0.93 wheel (opencv_python.libs/libavcodec-*.so.62.28.101) with avcodec_find_decoder_by_name:
| Decoder | Present |
|---|---|
av1 (FFmpeg's native decoder, which needs a hwaccel) |
yes |
libdav1d |
no |
libaom-av1 |
no |
So there is no software AV1 decoder, which is what #1209 adds. (The wheel does ship a libaom shared object, but libavcodec does not register a decoder for it.)
Workaround
Pin opencv-python(-headless)==4.14.0.94, or transcode to H.264 before reading.
Related
- #908: original report, closed by #1209
- #1209: the fix (dav1d in the manylinux and musllinux images), merged into
4.xand present on5.xas314eb3d2
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