[PATCH 0/1] fix libgav1 on GNU/Hurd Debian

[Yuqian Yang <crupest@crupest.life>]

Hello!

I have fixed libgav1[1] building on GNU/Hurd Debian.
It depends on abseil, which has been fixed in the
previous patch[2] of me. So to build libgav1, you need
to first build abseil and apt install it.

I have also pushed this patch to upstream at
<https://chromium-review.googlesource.com/c/codecs/libgav1/+/6239812>.
(The CI there seems to fail with some unknown problem. It needs
maintainers of it to check.)

After building and installing libgav1, you can test
it with its builtin `gav1_decode` tool by following steps.

1. Install ffmpeg.

2. Find one of your favorite video file. Let's say it is
   `love.mp4`. Other formats supported by ffmpeg are OK.
    Clip it and convert it to av1 with

     ffmpeg  -i love.mp4 -t 5s -s 960x540 -fpsmax 24 -c:v av1 -c:a none love.vif

   You may adjust options for the quality and size of the
   output video as you like. Don't use a too long video.
   Because it will be decoded into yuv format, which is just
   a image of every frame. The output file will be super big.

3. Transfer `love.vif` to your GNU/Hurd Debian machine.
   Decode it with,

     gav1_decode -v --y4m love.ivf -o love.yuv

4. Transfer `love.yuv` back for testing. Convert it to
   a another video format you like,

     ffmpeg -i love.yuv -ss 0 -t 5s love1.mp4

   NOTE: You have to manually specify the video time.
         Otherwise, the video will be a static image,

5. Play the video file and check the content.

Thanks for people who helped me.

Yuqian Yang (1):
  Disable gettid for GNU/Hurd.

 src/utils/threadpool.cc | 2 ++
 1 file changed, 2 insertions(+)

[1] https://salsa.debian.org/multimedia-team/libgav1
[2] https://lists.debian.org/debian-hurd/2025/02/msg00011.html
-- 
Yuqian Yang <crupest@crupest.life>