Hacktoberfest 2026 : les issues que les mainteneurs ont marquées pour octobre, ouvertes et accessibles aux débutants. Parcourir les issues Hacktoberfest

5.x Linux wheels still cannot decode AV1: 5.0.0.93 predates the dav1d fix (#1209), please release a 5.x build

Ouverte
  • Quelque chose ne va pas ?
#1,276 0 commentaires 0 réactions 0 personnes assignées Voir sur GitHub

Personne n'a encore pris cette issue.

Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
35/100
Type d'issue
Bug
Clarté
Clairement spécifiée
Activité
Active
Stack technique
python
Domaine
release

Piste de recherche

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.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

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
Langage dominant
Python
Étoiles
5.4k
Forks
1k
Aucune PR mergée en 30 j

Préparer son environnement

Par où commencer

  1. Lisez l'issue en entier, puis le guide de contribution du projet.
  2. Signalez en commentaire que vous la prenez — cela évite que deux personnes fassent le même travail.
  3. Forkez le dépôt et travaillez sur une branche.
  4. Ouvrez une pull request qui référence le numéro de l'issue.

Autres issues de opencv/opencv-python

Toutes les issues de opencv/opencv-python

Issues similaires

Plus d'issues Python

Recevez les nouvelles issues par e-mail

Un résumé court des issues GitHub adaptées aux débutants.