[FFmpeg-trac] #10252(ffmpeg:new): v4l2 fails on AMD Geode
FFmpeg
trac at avcodec.org
Sat Mar 11 10:50:56 EET 2023
#10252: v4l2 fails on AMD Geode
-------------------------------------+-------------------------------------
Reporter: | Type: defect
cherniaev.andrei |
Status: new | Priority: normal
Component: ffmpeg | Version: git-
| master
Keywords: avcodec | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I try get photo from my webcam. But ffmpeg process was killed by Linux
because of two reasons.
How to reproduce:
{{{
ffmpeg -v 9 -loglevel 99 -f video4linux2 -i /dev/video0 -vframes 1
-video_size 640x480 test.jpeg
}}}
I use Ubuntu 22 with kernel 5.19.0-35-generic on my x86-64 PC. My webcam
works good.
I use Buildroot with kernel 5.4.228 on my AMD Geode. (I also try 4.19.269
and 6.2.2) My webcam (ffmpeg) fails becasue of:
Reason 1) Look at libavdevice/v4l2.c Why 256 buffers in
static const int desired_video_buffers = 256;
?
My Geode can't work with 256 buffers. I don't know why. But i try to set
static const int desired_video_buffers = 2;
And no more fails because of reason 1)
Reason 2) Looks at libavcodec/raw.c
What happend in avcodec_pix_fmt_to_codec_tag() ?
{{{
while (tags->pix_fmt >= 0) {
...
tags++;
}
}}}
Looks like this functions should use while like in find_pix_fmt()
{{{
while (tags->pix_fmt != AV_PIX_FMT_NONE) {
...
tags++;
}
}}}
Isn't it?
In my case ffmpeg fails in avcodec_pix_fmt_to_codec_tag().
This is information about ffmpeg on my PC
a at PC:~$ ffmpeg --version
ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg
developers
built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --enable-gnutls --enable-ladspa --enable-libaom
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
--enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-
libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-
libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus
--enable-libpulse --enable-librabbitmq --enable-librubberband --enable-
libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-
libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-
libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-
libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq
--enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl
--enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg
--enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883
--enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100
This is information about ffmpeg on my AMD Geode. ffmpeg 6.0 has the same
code.
--Buildroot with Linux Kernel is 5.4.228--
# ffmpeg -v 9 -loglevel 99 -f video4linux2 -i /dev/video0 -vframes 1
-video_size 640x480 test.jpeg
ffmpeg version 5.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12.2.0 (Buildroot -gaff43177-dirty)
configuration: --enable-cross-compile --cross-
prefix=/home/a/LINUX_TARGET/Buildroot_repo/buildroot/output/host/bin/i586
-buildroot-linux-gnu-
--sysroot=/home/a/LINUX_TARGET/Buildroot_repo/buildroot/output/host/i586
-buildroot-linux-gnu/sysroot --host-cc=/usr/bin/gcc --arch=i586 --target-
os=linux --disable-stripping --pkg-
config=/home/a/LINUX_TARGET/Buildroot_repo/buildroot/output/host/bin/pkg-
config --disable-static --enable-shared --prefix=/usr --enable-avfilter
--disable-version3 --enable-logging --disable-optimizations --disable-
extra-warnings --enable-avdevice --enable-avcodec --enable-avformat
--disable-network --disable-gray --enable-swscale-alpha --disable-small
--enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd
--disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables
--disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels
--disable-cuda --disable-cuvid --disable-nvenc --disable-avisynth
--disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb
--disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libvo-
amrwbenc --disable-symver --disable-doc --enable-gpl --enable-nonfree
--enable-ffmpeg --disable-ffplay --enable-libv4l2 --disable-ffprobe
--disable-libxcb --enable-postproc --enable-swscale --enable-indevs
--disable-alsa --disable-outdevs --enable-pthreads --enable-zlib --enable-
bzlib --disable-libfdk-aac --disable-libcdio --enable-gnutls --disable-
openssl --disable-libdrm --disable-libopenh264 --disable-vaapi --disable-
vdpau --disable-mmal --disable-omx --disable-omx-rpi --disable-libopencv
--disable-libopus --disable-libvpx --disable-libass --disable-libbluray
--disable-libmfx --disable-librtmp --disable-libmp3lame --disable-
libmodplug --disable-libspeex --disable-libtheora --disable-iconv
--disable-libfreetype --disable-fontconfig --disable-libopenjpeg
--disable-libx264 --disable-libx265 --disable-libdav1d --disable-x86asm
--enable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3
--disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --disable-
armv6 --disable-armv6t2 --disable-vfp --disable-neon --disable-altivec
--extra-libs=-latomic --enable-pic --cpu=geode
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
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with
argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument '99'.
Reading option '-f' ... matched as option 'f' (force format) with argument
'video4linux2'.
Reading option '-i' ... matched as input url with argument '/dev/video0'.
Reading option '-vframes' ... matched as option 'vframes' (set the number
of video frames to output) with argument '1'.
Reading option '-video_size' ... matched as AVOption 'video_size' with
argument '640x480'.
Reading option 'test.jpeg' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input url /dev/video0.
Applying option f (force format) with argument video4linux2.
Successfully parsed a group of options.
Opening an input file: /dev/video0.
[video4linux2,v4l2 @ 0x197b2c0] fd:3 capabilities:84a00001
[video4linux2,v4l2 @ 0x197b2c0] Current input_channel: 0, input_name:
Camera 1, input_std: 0
[video4linux2,v4l2 @ 0x197b2c0] Querying the device for the current frame
size
[video4linux2,v4l2 @ 0x197b2c0] Setting frame size to 3840x2160
[video4linux2,v4l2 @ 0x197b2c0] The V4L2 driver changed the pixel format
from 0x32315559 to 0x47504A4D
[video4linux2,v4l2 @ 0x197b2c0] Trying to set codec:rawvideo
pix_fmt:yuv420p
[video4linux2,v4l2 @ 0x197b2c0] The V4L2 driver changed the pixel format
from 0x32315559 to 0x47504A4D
[video4linux2,v4l2 @ 0x197b2c0] Trying to set codec:rawvideo
pix_fmt:yuv420p
[video4linux2,v4l2 @ 0x197b2c0] The V4L2 driver changed the pixel format
from 0x32315659 to 0x47504A4D
[video4linux2,v4l2 @ 0x197b2c0] Trying to set codec:rawvideo
pix_fmt:yuv422p
[video4linux2,v4l2 @ 0x197b2c0] The V4L2 driver changed the pixel format
from 0x50323234 to 0x47504A4D
[video4linux2,v4l2 @ 0x197b2c0] Trying to set codec:rawvideo
pix_fmt:yuyv422
Killed
Webcam is ELP-USB4K02AF-KL100W http://www.elpcctv.com/elp-128-sony-imx415
-sensor-night-vision-4k-usb-camera-with-white-led-p-169.html
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10252>
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