Read .mjpeg (and stop?)

[aolbrechts]

Hello,

I'm writing a small page/app that is used via the web to control the basic functions of a camera (change settings + take picture and download).

It rather works as I want for the moment (haven't implemented the timelapse functions I'm planning on) but I have issues with the liveview capture.

I'm using this code to start the capture : exec("gphoto2 --capture-movie --stdout | ffmpeg -i pipe:0 /var/www/html/fifo.mjpg");

I get a fifo.mjpg file but I can't open it anywhere (even VLC ... ?). I can't display it in a webpage either, I only get the first frame.

What could I do to verify that the live capture works?

(additional question : elsewhere in my script I have to end the live capture but I can't find what code to use? I have the code to bring the mirror down but it doesn't work because the live capture process is still in action).

Any help on this? Thanks for your help!

[pReya]

@aolbrechts Did you find a solution for this, yet?

[aolbrechts]

Unfortunately, no :(

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Le 18 oct. 2019 à 13:44, Moritz Stückler notifications@github.com<mailto:notifications@github.com> a écrit :

@aolbrechtshttps://github.com/aolbrechts Did you find a solution for this, yet?

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[msmeissn]

to verify it works, you can run gphoto2 --capture-movie=10s on the commandline and see if that is playable in e.g. mplayer?

Parallel instances of gphoto2 accessing the same device will be tricky, as the cameras only support 1 session, so if you want to do configuration, capture and preview capture in parallel, it needs to be in one process.

Someone has likely written something like it already, i dont know it from the top of my head though.

[pReya]

To look at the live preview in VLC, you don't need ffmpeg or a FIFO, just the right CLI parameter for VLC. You need to specifiy a framerate at which the MJPEG should be played. You can test the framerate of your cam if you just run gphoto2 --capture-movie=10s. After 10s you will see how many frames were captured. Just divide this by 10 and you have a good value to put into this VLC parameter: gphoto2 --capture-movie --stdout | vlc - --mjpeg-fps 30