Subject: bug#39714: closed (Re: bug#39719: Acknowledgement (FFmpeg library preference for dav1d))

From: [email-masked] (GNU bug Tracking System)
Date: Fri, 20 Mar 2020 22:55:02 +0000

Your bug report

#39719: Real-time AV1 playback in VLC

which was filed against the guix-patches package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
39719: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=39719
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#39719: Acknowledgement (FFmpeg library preference for dav1d)
From: Leo Famulari <[email-masked]>
To: [email-masked]
Date: Fri, 20 Mar 2020 18:54:51 -0400
List-Id: <debbugs-submit.debbugs.gnu.org>

I pushed fixes for FFmpeg and VLC as commit
f08040c5f864df1e85573172aa921e42ceef6859.

Subject: Real-time AV1 playback in VLC
From: Leo Famulari <[email-masked]>
To: [email-masked]
Date: Fri, 21 Feb 2020 11:25:58 -0500
List-Id: <debbugs-submit.debbugs.gnu.org>

On my Thinkpad x230, VLC cannot play back AV1 videos in real-time. They
stutter and drop frames.

This is because our VLC's AV1 playback is being provided by FFmpeg,
which by default chooses libaom, which is too slow.

By building VLC with the dav1d AV1 decoder, VLC chooses to use dav1d for
playback, and everything is fine.

Here are some AV1 samples; I like the 1080 "Summer Nature" clip:

https://www.elecard.com/videos