[v4l2-sink] Broken since last update

[ManuLinares]

• I have read the FAQ.
• I have searched in existing issues.

Environment

• OS: Linux Arch
• scrcpy version: 2.0
• installation method: pacman -S scrcpy
• device model: Device: Google Pixel 6a (Android 13)
• Android version: 13

Describe the bug

Trying v4l2loopback device, it doesn't fail but I can't see the output on the new device.

user@pc ~ $ sudo modprobe v4l2loopback devices=1 video_nr=10 card_label="Virtual_Webcam"

user@pc ~ $ scrcpy --v4l2-sink=/dev/video10  --max-size=1024 --lock-video-orientation=3
scrcpy 2.0 <https://github.com/Genymobile/scrcpy>
/usr/share/scrcpy/scrcpy-server: 1 file pushed, 0 skipped. 483.5 MB/s (52867 bytes in 0.000s)
[server] INFO: Device: Google Pixel 6a (Android 13)
INFO: Renderer: opengl
INFO: OpenGL version: 4.6.0 NVIDIA 530.41.03
INFO: Trilinear filtering enabled
INFO: Initial texture: 1024x464
INFO: v4l2 sink started to device: /dev/video10

This hangs: ffplay /dev/video10
After a while ffprobe outputs: Failed to reallocate parser buffer to -2146536384

[rom1v]

Thank you for your report.

On which commit? #3795 fixed it after 2.0.

git pull on master.

[ManuLinares]

Thank you for your report.

On which commit? #3795 fixed it after 2.0.

git pull on master.

yeah, I'm using latest git: scrcpy-git 2.0.r18.g21df2c24-1

edit: v4l2loopback-dkms 0.12.7-2

[rom1v]

yeah, I'm using latest git: scrcpy-git

installation method: pacman -S scrcpy

🤔

You must compile the latest master version: https://github.com/Genymobile/scrcpy/blob/master/doc/linux.md#latest-version

[ManuLinares]

yeah, I'm using latest git: scrcpy-git

installation method: pacman -S scrcpy

thinking

You must compile the latest master version: https://github.com/Genymobile/scrcpy/blob/master/doc/linux.md#latest-version

I did (just didn't edited my original post)

I built latest master from git according to your comment, and retested. Still not working.

upmost entry in the git log where I'm building.

commit 21df2c240e544b1c1eba7775e1474c1c772be04b (HEAD -> master, origin/tmp, origin/master, origin/HEAD)
Author: Romain Vimont <rom@rom1v.com>
Date:   Thu Mar 23 19:02:14 2023 +0100

    Mention necessary reboot
    
    After setting "USB debugging (security settings)", a reboot is
    necessary.

Clarification: First tried https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=scrcpy-git which builds from master, then I just compiled myself from master.

[rom1v]

OK, weird. I could not reproduce.

[rom1v]

scrcpy 2.0 https://github.com/Genymobile/scrcpy
/usr/share/scrcpy/scrcpy-server

It still uses the version installed by the package manager, if you build manually it is installed in /usr/local/…

Uninstall your package.

[ManuLinares]

I'm building manually, and executing the binary from the built binary in 'build/app'

sha256sum /usr/share/scrcpy/scrcpy-server
9e241615f578cd690bb43311000debdecf6a9c50a7082b001952f18f6f21ddc2  /usr/share/scrcpy/scrcpy-server

the "install_release.sh" just downloads the prebuilt server, its the same sha256.

[ManuLinares]

I also executed with SCRCPY_SERVER_PATH=~/scripts/scrcpy-git/src/scrcpy/build/server/scrcpy-server ./app/scrcpy --v4l2-sink=/dev/video10 but the scrcpy-server sha256 is the same as installed so I don't think this changes anything

(maybe it helps) ffplay sometimes outputs nothing and sometimes some errors:

ffplay version n6.0 Copyright (c) 2003-2023 the FFmpeg developers
  built with gcc 12.2.1 (GCC) 20230201
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
[h264 @ 0x7f2c08001a80] non-existing PPS 5 referenced    0B f=0/0   
[h264 @ 0x7f2c08001a80] non-existing PPS 0 referenced
[h264 @ 0x7f2c08001a80] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c08001a80] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c08001a80] non-existing PPS 5 referenced
[h264 @ 0x7f2c08001a80] decode_slice_header error
[h264 @ 0x7f2c08001a80] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c08001a80] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c08001a80] no frame!
[video4linux2,v4l2 @ 0x7f2c08000c80] Could not find codec parameters for stream 0 (Video: h264, none, 720x400): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, video4linux2,v4l2, from '/dev/video10':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264, none, 720x400, 30 fps, 30 tbr, 1000k tbn
[h264 @ 0x7f2c080d1680] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080d1680] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080d1680] non-existing PPS 5 referenced
[h264 @ 0x7f2c080d1680] decode_slice_header error
[h264 @ 0x7f2c080d1680] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080d1680] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080d1680] no frame!
[h264 @ 0x7f2c080cf9c0] A non-intra slice in an IDR NAL unit.
[h264 @ 0x7f2c080cf9c0] decode_slice_header error
[h264 @ 0x7f2c080cf9c0] no frame!
[NULL @ 0x7f2c08001a80] non-existing PPS 95 referenced   0B f=0/0   
[NULL @ 0x7f2c08001a80] non-existing PPS 27 referenced   0B f=0/0   
[h264 @ 0x7f2c080c8900] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080c8900] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080c8900] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080c8900] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080c8900] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080c8900] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080c8900] non-existing PPS 95 referenced
[h264 @ 0x7f2c080c8900] decode_slice_header error
[h264 @ 0x7f2c080c8900] data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[h264 @ 0x7f2c080c8900] If you want to help, upload a sample of this file to https://streams.videolan.org/upload/ and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
[h264 @ 0x7f2c080c8900] no frame!
[h264 @ 0x7f2c081c06c0] A non-intra slice in an IDR NAL unit.
[h264 @ 0x7f2c081c06c0] decode_slice_header error
[h264 @ 0x7f2c081c06c0] no frame!

ffmpeg version 2:6.0-4.1

[rom1v]

Could you please build v1.25 (you could use the prebuilt server from release 1.25) and dev branch (you need to build the server manually, or I can provide one)?

[ManuLinares]

You'd want me to test this
https://github.com/Genymobile/scrcpy/releases/tag/v1.25

and this
https://github.com/Genymobile/scrcpy/tree/dev
and for the "dev" build I'll need to compile the server or you provide one.

am I understanding correctly?

The answer is yes, I can test them.

[ManuLinares]

My compilation rundown to see if I commit any mistake:

mkdir temp
git clone -b dev --single-branch https://github.com/Genymobile/scrcpy.git
cd scrcpy/
export ANDROID_SDK_ROOT=~/Android/Sdk
meson setup x --buildtype=release --strip -Db_lto=true
ninja -Cx

SCRCPY_SERVER_PATH=~/temp/scrcpy/x/server/scrcpy-server x/app/scrcpy --v4l2-sink=/dev/video10 --lock-video-orientation=1

ffplay /dev/video10

The 1.25 ver I downloaded from https://github.com/Genymobile/scrcpy/archive/refs/tags/v1.25.tar.gz

edit: I have to make some more tests, did something, it worked, sorry need time to debug

edit2: both the dev build and the 1.25 build worked. I also tried building from master and it also worked. So it is just the arch prebuilt community/scrcpy 2.0-1 that doesn't.

[rom1v]

OK, thank you for your tests 👍

So it's fixed by cbca79b on master (#3795).