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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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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
35/100
Tipo di issue
Bug
Chiarezza
Specificata chiaramente
Stato di attività
Attiva
Stack tecnologico
python
Ambito
release

Direzione di ricerca

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.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

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.x and present on 5.x as 314eb3d2
Lingua principale
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