Re: Video capture on EOS 650d only with 4 to 8 fps?

I'm not a Canon person but where are you putting your video?  The
transfer off is likely to be a bottleneck.  There are adapters that
replace memory cards but send by wifi, one of those may help.

On 12/20/20, Thomas Orgis <[email protected]> wrote:
> Hi,
>
> I am trying to use an EOS 650d for video streaming. Ideally, I'd like
> to use it as high-quality webcam vor conferencing. Before going into
> details: Is that even feasible? I've read about a 2 second delay that
> you don't get rid of. If that is a hardware property, this ends much of
> the fun right away and I'm better off buying a normal UVC cam. But I
> was curious if I could use the superior optics of the DSLR.
>
> Test platform is a Core i7 laptop with Ubuntu 20.04. I switch on the
> camera for video, then run
>
> 	gphoto2 --capture-movie=10s
> .
> This does record video and creates a file movie.mjpg. But it records
> way to few frames. It tells me it recorded 44 frames for 10 seconds of
> video. MPlayer plays with 25 fps for some accelerated motion …
>
> Likewise, if I stream to v4l2loopback the live view on the laptop is
> jerky, with the low framerate.
>
> gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt
> yuv420p -threads 2 -f v4l2 /dev/video0
> Nehme Vorschaubilder als Film in 'stdout' auf. Drücke Ctrl-C zum abbrechen.
> ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg
> developers
>   built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
>   configuration: --prefix=/usr --extra-version=1ubuntu0.1
> --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
> --disable-stripping --enable-avresample --disable-filter=resample
> --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libcodec2 --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-librsvg
> --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr
> --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame
> --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack
> --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
> --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal
> --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394
> --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint
> --enable-frei0r --enable-libx264 --enable-shared
>   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
> [mjpeg @ 0x5647c56f7780] 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), 960x640, 25 tbr, 1200k tbn, 25 tbc
> Stream mapping:
>   Stream #0:0 -> #0:0 (mjpeg (native) -> rawvideo (native))
> [swscaler @ 0x5647c5754740] deprecated pixel format used, make sure you did
> set range correctly
> Output #0, video4linux2,v4l2, to '/dev/video0':
>   Metadata:
>     encoder         : Lavf58.29.100
>     Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 960x640,
> q=2-31, 184320 kb/s, 25 fps, 25 tbn, 25 tbc
>     Metadata:
>       encoder         : Lavc58.54.100 rawvideo
> frame=   27 fps=5.2 q=-0.0 size=N/A time=00:00:01.08 bitrate=N/A
> speed=0.208x
>
> Now the fps settles around 4.something, I had 8 fps before. But never
> smooth.
>
> Is 8 fps all that I can get from the camera? The live view on the TFT of
> the camera looks smooth during capture.
>
>
> Alrighty then,
>
> Thomas
>
>
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>


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