[FFmpeg-trac] #2370(avdevice:new): v4l2 should not need ENUMSTD
FFmpeg
trac at avcodec.org
Sun Mar 17 05:26:20 CET 2013
#2370: v4l2 should not need ENUMSTD
-------------------------------------+-------------------------------------
Reporter: ubitux | Owner:
Type: defect | Status: new
Priority: important | Component: avdevice
Version: git- | Keywords: v4l2
master | regression
Blocked By: | Blocking:
Reproduced by developer: 1 | Analyzed by developer: 0
-------------------------------------+-------------------------------------
Problem: lavd/v4l2.c now requires the device to support VIDIOC_ENUMSTD.
This seems to be a regression according to
https://github.com/umlaeute/v4l2loopback/issues/38
Steps to reproduce:
- install v4l2loopback and load the module
{{{
git clone git://github.com/umlaeute/v4l2loopback.git
cd v4l2loopback
make && sudo make install
modprobe v4l2loopback
}}}
- push some video to the device with for instance:
{{{
gst-launch-0.10 videotestsrc ! v4l2sink device=/dev/video0
}}}
- try to play the device with FFmpeg
{{{
% ./ffplay -v verbose -f v4l2 /dev/video0
ffplay version N-51026-g3313b9c Copyright (c) 2003-2013 the FFmpeg
developers
built on Mar 17 2013 04:38:52 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --enable-fontconfig
--enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-
libxvid --enable-libx264 --enable-libvpx --enable-libtheora --enable-
x11grab --enable-libopenjpeg --enable-libass --enable-libmodplug --enable-
libv4l2 --cc=colorgcc --samples=/home/ubitux/fate-samples
--prefix=/tmp/ffinstall --disable-runtime-cpudetect --enable-libcelt
--enable-libopencv --enable-frei0r --enable-libcaca --enable-libiec61883
--enable-libopencore-amrwb --enable-libopencore-amrnb --enable-libopus
--enable-libpulse --enable-libspeex --enable-openal --enable-libopencv
libavutil 52. 19.101 / 52. 19.101
libavcodec 55. 0.100 / 55. 0.100
libavformat 55. 0.100 / 55. 0.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 47.102 / 3. 47.102
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[video4linux2,v4l2 @ 0x7f457c000940] fd:7 capabilities:50000030/0
[video4linux2,v4l2 @ 0x7f457c000940] Querying the device for the current
frame size
[video4linux2,v4l2 @ 0x7f457c000940] Setting frame size to 320x240
[video4linux2,v4l2 @ 0x7f457c000940] ioctl(VIDIOC_ENUMSTD): Invalid
argument
/dev/video0: Invalid argument
}}}
The device plays fine with for example mplayer, and with older ffplay
(1.1.3 is working).
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2370>
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