#149 Canon EOS 1100D Capture-movie Lag
Hi Team,
I'm stuck with an issue and I can't find information about how to solve them.
I connect properly the cam but when is sending video as a webcam have a lag of .5s , and I don't know if I'm missing a configuration, can you help me?, I'm using this command:
$ gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video2
ffmpeg version 4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10 (GCC)
configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsrt --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-version3 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-libzvbi --enable-avfilter --enable-avresample --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libavresample 4. 0. 0 / 4. 0. 0
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Capturing preview frames as movie to 'stdout'. Press Ctrl-C to abort.
[mjpeg @ 0x555f0d15d300] Format mjpeg detected only with low score of 25, misdetection possible!
Input #0, mjpeg, from 'pipe:':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1056x704, 25 tbr, 1200k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> rawvideo (native))
[swscaler @ 0x555f0d1ab700] deprecated pixel format used, make sure you did set range correctly
Output #0, video4linux2,v4l2, to '/dev/video2':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1056x704, q=2-31, 223027 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.54.100 rawvideo
Movie capture finished (151185 frames)
frame=151185 fps= 17 q=-0.0 Lsize=N/A time=01:40:47.40 bitrate=N/A speed=0.685x
The properties of the camara are this:
$ gphoto2 --auto-detect
Model Port
Canon EOS 1100D usb:001,012
$ gphoto2 --summary
Camera summary:
Manufacturer: Canon Inc.
Model: Canon EOS REBEL T3
Version: 3-1.0.5
Serial Number: 9995c28f144a4377a5fbde82c8642951
Vendor Extension ID: 0xb (2.0)
Capture Formats: JPEG
Display Formats: Association/Directory, Script, DPOF, MS AVI, MS Wave, JPEG, CRW, Unknown(b103), Unknown(bf02), Defined Type, Unknown(b104), Unknown(b105)
Device Capabilities:
File Download, File Deletion, File Upload
No Image Capture, No Open Capture, Canon EOS Capture, Canon EOS Capture 2
Storage Devices Summary:
store_00020001:
StorageDescription: SD
VolumeLabel: None
Storage Type: Removable RAM (memory card)
Filesystemtype: Digital Camera Layout (DCIM)
Access Capability: Read-Write
Maximum Capability: 125271277568 (119468 MB)
Free Space (Bytes): 125260005376 (119457 MB)
Free Space (Images): -1
Device Property Summary:
Property 0xd402:(read only) (type=0xffff) 'Canon EOS REBEL T3'
Property 0xd407:(read only) (type=0x6) 1
Property 0xd406:(readwrite) (type=0xffff) 'Unknown Initiator'
Property 0xd303:(read only) (type=0x2) 1
Battery Level(0x5001):(read only) (type=0x2) Enumeration [100,0,75,0,50] value: 100% (100)
$v4l2-ctl -d /dev/video2 --all
Driver Info:
Driver name : v4l2 loopback
Card type : Dummy video device (0x0000)
Bus info : platform:v4l2loopback-000
Driver version : 5.7.6
Capabilities : 0x85208003
Video Capture
Video Output
Video Memory-to-Memory
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x05208003
Video Capture
Video Output
Video Memory-to-Memory
Read/Write
Streaming
Extended Pix Format
Priority: 0
Video input : 0 (loopback: ok)
Video output: 0 (loopback in)
Format Video Capture:
Width/Height : 1056/704
Pixel Format : 'YU12' (Planar YUV 4:2:0)
Field : None
Bytes per Line : 1056
Size Image : 1115136
Colorspace : sRGB
Transfer Function : Default (maps to sRGB)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Format Video Output:
Width/Height : 1056/704
Pixel Format : 'YU12' (Planar YUV 4:2:0)
Field : None
Bytes per Line : 1056
Size Image : 1115136
Colorspace : sRGB
Transfer Function : Default (maps to sRGB)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Limited Range)
Flags :
Streaming Parameters Video Capture:
Frames per second: 30.000 (30/1)
Read buffers : 2
Streaming Parameters Video Output:
Frames per second: 30.000 (30/1)
Write buffers : 2
User Controls
keep_format 0x0098f900 (bool) : default=0 value=0 sustain_framerate 0x0098f901 (bool) : default=0 value=0 timeout 0x0098f902 (int) : min=0 max=100000 step=1 default=0 value=0 timeout_image_io 0x0098f903 (bool) : default=0 value=0