Hello,

I'm doing a capture of an image from the docker using my web cam, but the
docker is doing it at a resolution of 176x144 and outside of the docker in
my localhost it takes it to 640x360, in both it's the same installation, I
do not know it's happening:

Docker
-----------------------------------------------------------------------------------
# ffmpeg -r 1 -f v4l2 -s 720x480 -i /dev/video0 -vframes 1 menu%d.jpg

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Debian 7.3.0-3)
  configuration: --disable-debug --disable-doc --disable-ffplay
--enable-shared --enable-avresample --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-gpl --enable-libass
--enable-libfreetype --enable-libvidstab --enable-libmp3lame
--enable-libopenjpeg --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx265 --enable-libxvid --enable-libx264
--enable-nonfree --enable-openssl --enable-libfdk_aac --enable-libkvazaar
--enable-postproc --enable-small --enable-version3
--extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
--extra-libs=-ldl --prefix=/opt/ffmpeg
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[video4linux2,v4l2 @ 0x55cbd71f70a0] The V4L2 driver changed the video from
720x480 to 176x144
[video4linux2,v4l2 @ 0x55cbd71f70a0] The driver changed the time per frame
from 1/1 to 1/5
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 59614.860847, bitrate: 2027 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 176x144,
2027 kb/s, 5 fps, 5 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x55cbd7209280] deprecated pixel format used, make sure you did
set range correctly
Output #0, image2, to 'menu%d.jpg':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: mjpeg, yuvj422p(pc), 176x144, q=2-31, 200 kb/s, 1
fps, 1 tbn, 1 tbc
    Metadata:
      encoder         : Lavc57.107.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=    1 fps=0.0 q=2.7 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=
424x
video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
---------------------------------------------------------------------------------------------


local
--------------------------------------------------------------------------------------
# ffmpeg -r 1 -f v4l2 -s 720x480 -i /dev/video0 -vframes 1 menu%d.jpg

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --enable-avisynth --enable-avresample
--enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl
--enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype
--enable-libfribidi --enable-libgsm --enable-libiec61883
--enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
--enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus
--enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxcb --enable-libxml2 --enable-libxvid --enable-shared
--enable-version3 --enable-omx
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[video4linux2,v4l2 @ 0x55c87b781a40] The V4L2 driver changed the video from
720x480 to 640x480
[video4linux2,v4l2 @ 0x55c87b781a40] The driver changed the time per frame
from 1/1 to 1/15
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 59593.137905, bitrate: 73728 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480,
73728 kb/s, 15 fps, 15 tbr, 1000k tbn, 1000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0x55c87b7935e0] deprecated pixel format used, make sure you did
set range correctly
Output #0, image2, to 'menu%d.jpg':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: mjpeg, yuvj422p(pc), 640x480, q=2-31, 200 kb/s, 1
fps, 1 tbn, 1 tbc
    Metadata:
      encoder         : Lavc57.107.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=    1 fps=0.0 q=4.9 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=
178x
video:21kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
---------------------------------------------------------------------------------------------

I checked how the camera was detected and I saw a difference, but I do not
know why

Docker
-----------------------------------------------------------------------------------
# ffmpeg -f v4l2 -list_formats all -i /dev/video0

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Debian 7.3.0-3)
  configuration: --disable-debug --disable-doc --disable-ffplay
--enable-shared --enable-avresample --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-gpl --enable-libass
--enable-libfreetype --enable-libvidstab --enable-libmp3lame
--enable-libopenjpeg --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx265 --enable-libxvid --enable-libx264
--enable-nonfree --enable-openssl --enable-libfdk_aac --enable-libkvazaar
--enable-postproc --enable-small --enable-version3
--extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
--extra-libs=-ldl --prefix=/opt/ffmpeg
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[video4linux2,v4l2 @ 0x55e122701f60] Raw       :     yuyv422 :
 YUYV 4:2:2 : 160x90 160x120 176x144
[video4linux2,v4l2 @ 0x55e122701f60] Compressed:        h264 :
  H.264 : 640x480 160x90 160x120 176x144 320x180 320x240 352x288 432x240
640x360 800x448 800x600 864x480 960x720 1024x576 1280x720
[video4linux2,v4l2 @ 0x55e122701f60] Compressed:       mjpeg :
Motion-JPEG : 640x480 160x90 160x120 176x144 320x180 320x240 352x288
432x240 640x360
---------------------------------------------------------------------------------------------

local
--------------------------------------------------------------------------------------
# ffmpeg -f v4l2 -list_formats all -i /dev/video0

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7.3.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static
--disable-stripping --enable-avisynth --enable-avresample
--enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl
--enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype
--enable-libfribidi --enable-libgsm --enable-libiec61883
--enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
--enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus
--enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh
--enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxcb --enable-libxml2 --enable-libxvid --enable-shared
--enable-version3 --enable-omx
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
[video4linux2,v4l2 @ 0x55b84fec19c0] Raw       :     yuyv422 :
 YUYV 4:2:2 : 640x480 320x180 320x240 352x288 424x240 640x360 848x480
960x540 1280x720
[video4linux2,v4l2 @ 0x55b84fec19c0] Compressed:       mjpeg :
Motion-JPEG : 640x480 320x180 320x240 352x288 424x240 640x360 848x480
960x540 1280x720

---------------------------------------------------------------------------------------------

-- 
  *Diego Alonso Uribe Gamez*
------------------------------

*Desarrollador web*

Twitter: @DiegoUG <http://www.twitter.com/DiegoUG>

Google+: +DiegoAlonsoUribeGamez
<https://plus.google.com/+DiegoAlonsoUribeGamez>
------------------------------
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