# Error: 'Your platform doesn't suppport hardware accelerated AV1 decoding.' when i use 'cv2.VideoCapture' **URL:** \ **Category:** Python\ **Tags:** ffmpeg, videoio\ **Created:** [July 23, 2022, 6:12am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605 "2022-07-23T06:12:49Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 23, 2022, 6:12am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/1 "2022-07-23T06:12:49Z")
**Version:** opencv-contrib-python 4.6.0.66 opencv-python 4.5.5.64 opencv\_videoio\_ffmpeg460\_64.dll **Video:** [![](https://us1.discourse-cdn.com/flex020/uploads/opencv/original/2X/0/050a5bfbc38e2442e8a0a2d9a0320bef0236fc40.jpeg "The Boys – Official Season 3 REDBAND Teaser Trailer | Prime Video") ](https://www.youtube.com/watch?v=elTgqUW-NYE) **Filename:** The Boys – Official Season 3 REDBAND Teaser Trailer - Prime Video.mkv **Code:** cv2.VideoCapture(path) **Error message:** [av1 @ 0000028a88053c40] Your platform doesn’t suppport hardware accelerated AV1 decoding. [av1 @ 0000028a88053c40] Failed to get pixel format. [av1 @ 0000028a88053c40] Missing Sequence Header. [av1 @ 0000028a88053c40] video\_get\_buffer: image parameters invalid [av1 @ 0000028a88053c40] get\_buffer() failed [av1 @ 0000028a88053c40] thread\_get\_buffer() failed [av1 @ 0000028a88053c40] Failed to allocate space for current frame. [av1 @ 0000028a88053c40] Get current frame error ---
**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\ **Post date:** [July 23, 2022, 1:29pm UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/2 "2022-07-23T13:29:05Z")
the first one is just a warning. it’ll try software decoding. the following lines seem to indicate that AV1 is still experimental, or the implementation that _this version of ffmpeg_ uses is experimental. [get ffmpeg](https://ffmpeg.org/download.html#build-windows), try `ffmpeg -i yourfile.mkv -f null -` (which decodes and discards the result). if that also fails/complains, your file may be the issue. also… you need to remove both python packages, and then install exactly one. both contain the base modules. if you have both/multiple installed, they WILL conflict. ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 24, 2022, 6:27am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/3 "2022-07-24T06:27:11Z")
This file works well in potplayer. I tried to input `ffmpeg -i 55.mkv -f null -` in cmd but display “ ‘ffmpeg’ is not an inner or outer command. ” Can you open this file in VSCode with python? Just download and try. I think opencv module is uncapable to decode YT download video. ---
**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\ **Post date:** [July 24, 2022, 12:34pm UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/4 "2022-07-24T12:34:29Z")
I said to > [@crackwitz](#): > > [get ffmpeg](https://ffmpeg.org/download.html#build-windows), before you can use the `ffmpeg` command on the command line. what is “potplayer”? does your file play with VLC? ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 25, 2022, 7:34am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/5 "2022-07-25T07:34:40Z")
This file can be opened with ffmpeg in cmd, the result returned as follow: ```auto ffmpeg version 5.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers built with gcc 12.1.0 (Rev2, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband libavutil 57. 28.100 / 57. 28.100 libavcodec 59. 37.100 / 59. 37.100 libavformat 59. 27.100 / 59. 27.100 libavdevice 59. 7.100 / 59. 7.100 libavfilter 8. 44.100 / 8. 44.100 libswscale 6. 7.100 / 6. 7.100 libswresample 4. 7.100 / 4. 7.100 libpostproc 56. 6.100 / 56. 6.100 [libaom-av1 @ 000002434cc0f940] 3.4.0-176-g9473c4783 Input #0, matroska,webm, from '55.mkv': Metadata: COMPATIBLE_BRANDS: isomiso2avc1mp41 MAJOR_BRAND : isom MINOR_VERSION : 512 ENCODER : IDMmkvlib0.1 LANGUAGE : und HANDLER_NAME : AudioHandler Duration: 00:01:46.60, start: 0.000000, bitrate: 1222 kb/s Stream #0:0: Video: av1 (Main), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default) Stream #0:1: Audio: opus, 48000 Hz, stereo, fltp (default) [libaom-av1 @ 000002434cc55680] 3.4.0-176-g9473c4783 Stream mapping: Stream #0:0 -> #0:0 (av1 (libaom-av1) -> wrapped_avframe (native)) Stream #0:1 -> #0:1 (opus (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: COMPATIBLE_BRANDS: isomiso2avc1mp41 MAJOR_BRAND : isom MINOR_VERSION : 512 HANDLER_NAME : AudioHandler LANGUAGE : und encoder : Lavf59.27.100 Stream #0:0: Video: wrapped_avframe, yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 23.98 tbn (default) Metadata: encoder : Lavc59.37.100 wrapped_avframe Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: encoder : Lavc59.37.100 pcm_s16le frame= 2555 fps=106 q=-0.0 Lsize=N/A time=00:01:46.58 bitrate=N/A speed=4.42x video:1178kB audio:19983kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown ``` But i still don’t know how to open it with opencv python, the warning is still exist. > [@crackwitz](#): > > what is “potplayer”? does your file play with VLC? Potplayer is a popular video player to play movie. I think it is just like VLC. ---
**Author:** ![cudawarped](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@cudawarped](https://forum.opencv.org/u/cudawarped)\ **Post date:** [July 25, 2022, 9:01am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/6 "2022-07-25T09:01:41Z")
If you provide a link to the exact file I can take a look. I can confirm that `cv::VideoCapture` can decode the av1 sample from [here](https://www.elecard.com/videos) using opencv\_videoio\_ffmpeg460\_64.dll. ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 25, 2022, 10:33am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/7 "2022-07-25T10:33:32Z")
> **[YT\_1.mkv](https://drive.google.com/file/d/1m5wI5u282WDqJm2vOPOawL2O9LHvoicO/view?usp=sharing)** > > Google Drive file. I am appreciated for that, just check this out. ---
**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\ **Post date:** [July 25, 2022, 10:58am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/8 "2022-07-25T10:58:31Z")
interesting… this might be worth a _bug report_. standalone ffmpeg does not complain at all. _how_ OpenCV uses ffmpeg is probably at fault. I have a somewhat stale ffmpeg 4.4.1 here. I’ll try with 5.1… nope, also behaves well. must be OpenCV then. ---
**Author:** ![cudawarped](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@cudawarped](https://forum.opencv.org/u/cudawarped)\ **Post date:** [July 25, 2022, 11:28am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/9 "2022-07-25T11:28:34Z")
Ignore my previous comment, I was testing on a build I made against FFmpeg 5.0. I can confirm that the previous test video I mentioned and the one you linked to don’t work with opencv\_videoio\_ffmpeg460\_64.dll. The error comes from [here](https://github.com/FFmpeg/FFmpeg/blob/130d19bf2044ac76372d1b97ab87ab283c8b37f8/libavcodec/av1dec.c#L569) and seems to imply that AV1 cannot be decoded in software. Anyway as @crackwitz says you could launch an issue with OpenCV to see if they can update opencv\_videoio\_ffmpegxxx\_64.dll. ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 26, 2022, 4:02am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/10 "2022-07-26T04:02:26Z")
> [@crackwitz](#): > > this might be worth a _bug report_. > [@cudawarped](#): > > Anyway as @crackwitz says you could launch an issue with OpenCV to see if they can update opencv\_videoio\_ffmpegxxx\_64.dll. OK, i did launch an issue in [GitHub](https://github.com/opencv/opencv/issues/22304)(btw, sorry for my lame English). Thank you for your suggestion. 🙂 ---
**Author:** ![cudawarped](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@cudawarped](https://forum.opencv.org/u/cudawarped)\ **Post date:** [July 26, 2022, 6:18am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/11 "2022-07-26T06:18:37Z")
Yea I saw that, unfortunatley it looks like something they have been discussing for a while so its unlikely to get fixed any time soon. ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 27, 2022, 5:29am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/12 "2022-07-27T05:29:53Z")
Idk why they ignored this problem for a very long time. Even i digged it out again, they seem to be not willing to solve this bug. ---
**Author:** ![cudawarped](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@cudawarped](https://forum.opencv.org/u/cudawarped)\ **Post date:** [July 27, 2022, 8:16am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/13 "2022-07-27T08:16:33Z")
They are not ignoring the problem this [issue](https://github.com/opencv/opencv/issues/11389) is still open. OpenCV is open source so nobody has submitted a PR yet to fix it. Unfortunately this only effects windows users who use the pre-built ffmpeg dll. I will see if I can dig out the instrucitons for building directly against ffmpeg for you, then you should be able to use a build of ffmpeg which supports av1 decoding. ---
**Author:** ![cudawarped](https://avatars.discourse-cdn.com/v4/letter/c/9dc877/32.png) [@cudawarped](https://forum.opencv.org/u/cudawarped)\ **Post date:** [July 27, 2022, 2:17pm UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/14 "2022-07-27T14:17:42Z")
To build against FFmpeg and get AV1 decoding you need to: 1. Build or download and extract a build of FFMpeg to _\_. I would suggest simply downloading from [here](https://github.com/BtbN/FFmpeg-Builds/releases) and depending on your license requirements you will want to download either [ffmpeg-n5.0.1-7-g7389a49fd3-win64-gpl-shared-5.0.zip](https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2022-06-30-12-32/ffmpeg-n5.0.1-7-g7389a49fd3-win64-gpl-shared-5.0.zip) or [ffmpeg-n5.0.1-7-g7389a49fd3-win64-lgpl-shared-5.0.zip](https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2022-06-30-12-32/ffmpeg-n5.0.1-7-g7389a49fd3-win64-lgpl-shared-5.0.zip) **Note:** I have personally tested these builds and not had an issue but any pre-built shared library build from there should work. 2. Create a cmake directory _\/cmake_. 3. Save the modified cmake script (_[`ffmpeg-config.cmake`](https://gist.github.com/cudawarped/8abdae042d969969e41a9905cb85cc30)_) adapted from the one mentioned in [Enabling system FFMPEG on windows · Issue #22273 · opencv/opencv · GitHub](https://github.com/opencv/opencv/issues/22273#issuecomment-1189598641) 4. Pass `CMAKE_PREFIX_PATH` or `FFMPEG_DIR` set to the directory containing the _ffmpeg-config.cmake_ script. i.e. _-DFFMPEG\_DIR=\/cmake_ 5. Include the flag `OPENCV_FFMPEG_USE_FIND_PACKAGE=ON` when calling cmake. Then check your cmake output to confirm you have something similar to the below > – Found FFMPEG: D:/3rd\_party/deps/ffmpeg-n5.0-latest-win64-gpl-shared-5.0/include (found version “5.0.1-5-g240d82f26e-20220611”) found components: avutil swresample swscale avcodec avformat avfilter avdevice and not > – FFMPEG: Downloading opencv\_videoio\_ffmpeg.dll from [https://raw.githubusercontent.com/opencv/opencv\_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/opencv\_videoio\_ffmpeg.dll](https://raw.githubusercontent.com/opencv/opencv_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/opencv_videoio_ffmpeg.dll) > – FFMPEG: Downloading opencv\_videoio\_ffmpeg\_64.dll from [https://raw.githubusercontent.com/opencv/opencv\_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/opencv\_videoio\_ffmpeg\_64.dll](https://raw.githubusercontent.com/opencv/opencv_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/opencv_videoio_ffmpeg_64.dll) > – FFMPEG: Downloading ffmpeg\_version.cmake from [https://raw.githubusercontent.com/opencv/opencv\_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/ffmpeg\_version.cmake](https://raw.githubusercontent.com/opencv/opencv_3rdparty/65ec04d4573dcdfa4531f0b9e67f35d8ffff873e/ffmpeg/ffmpeg_version.cmake) ---
**Author:** ![Buobuo](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/buobuo/32/5706_2.png) [@Buobuo](https://forum.opencv.org/u/Buobuo)\ **Post date:** [July 29, 2022, 5:47am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/15 "2022-07-29T05:47:25Z")
WOW, that looks like too complicated for me. I never used cmake before. Maybe i will try it in the future. Anyway, your continuous help is much appreciated and I benefited a lot. ---
**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\ **Post date:** [July 29, 2022, 6:23am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/16 "2022-07-29T06:23:06Z")
run cmake-gui. it’ll make all that less daunting. ![image](https://us1.discourse-cdn.com/flex020/uploads/opencv/original/2X/c/ce12dcdd2769434a0bec10278b4bef5af6aa6cad.png) ---
**Author:** ![crackwitz](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/crackwitz/32/14_2.png) [@crackwitz](https://forum.opencv.org/u/crackwitz)\ **Post date:** [May 2, 2024, 10:17am UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/17 "2024-05-02T10:17:32Z")
3 posts were split to a new topic: [Get opencv to recognize ffmpeg other than the default binaries](https://forum.opencv.org/t/get-opencv-to-recognize-ffmpeg-other-than-the-default-binaries/17504) ---
**Author:** ![Markus\_Kaukonen](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/markus_kaukonen/32/12025_2.png) [@Markus\_Kaukonen](https://forum.opencv.org/u/Markus_Kaukonen)\ **Post date:** [February 12, 2025, 2:59pm UTC](https://forum.opencv.org/t/error-your-platform-doesnt-suppport-hardware-accelerated-av1-decoding-when-i-use-cv2-videocapture/9605/18 "2025-02-12T14:59:12Z")
chatgpt gave me this to convert format to mp4: ffmpeg -i input.mkv -c:v libx264 -crf 23 -preset fast -c:a aac output.mp4 It worked for me (ubuntu 24.04)