LuckyLuke8
Lurker
In smartphone, pixel 3a XL with Android 8.0, I discover /dev/video* does not exist. Why doesn’t it exist? Is there another device file that is able to interact with camera hardware?
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Android device file
- Thread starter LuckyLuke8
- Start date
That's an interesting error, that I've never seen before. All I can think of is, are you using a custom ROM? If so, which?
LuckyLuke8
Lurker
Nope… I’m using pixel 3a emulator by means Android studio
So it's an app development problem? Could be because an emulator doesn't actually have any "camera hardware"? Just a guess, but I don't know so much about that, I'm not a dev.
Last edited:
Jason Edwardes
Newbie
I would use physical device, trying to use the emulator(camera)does not make any sense imo,
What's the emulator going to view/recored, how do you check it's using the right camera?
What's the emulator going to view/recored, how do you check it's using the right camera?
Jason Edwardes
Newbie
Just did a quick goggle search and I found this https://www.viralpatel.net/enable-camera-in-android-emulator/
Hope it helps.
Hope it helps.
LuckyLuke8
Lurker
So, when i run some application that uses camera (without regarding to what kind of camera uses..Front camera or Back Camera), it works. In Android Studio, i can use the PC camera and even in this case when i run the application using the PC camera it works . The strange thing is that i does not find out /dev/video* file. So at this point, what is the method to interact at low level with camera? I know that Android is a distribution of Linux. In linux, to interact to hardware, i need to use a special file (character file or block file)...
Jason Edwardes
Newbie
The phone could be recording in a format/size not compatible with android studio, this would be the first thing I would check.
The permissions may not be the same on the emulator as they are on your phone.
https://developer.android.com/guide/topics/media/media-formats
The permissions may not be the same on the emulator as they are on your phone.
https://developer.android.com/guide/topics/media/media-formats
LuckyLuke8
Lurker
In this case, the application shouldn’t be able to record video( video file). In my case, the application records video. In addition i can play the video recorded by my application…
Jason Edwardes
Newbie
I will have a go myself tonight but my app will play small video files but I can't get it to play a 30min 2.1gb video file(mp3, 1080p)
Also found some image/video types don't seem to play, guess there away around it.
I will try this tutorial tonight as a starting point and see how I get on.
https://www.geeksforgeeks.org/android-how-to-open-camera-through-intent-and-display-captured-image/
LuckyLuke8
Lurker
You can use directly the application of Android system to record video. My attention is not focused to develop application but to discover what kind of process are involved and in particular trying to discover why there isn't /dev/video* file and why video4linux is not installed in Pixel 3a. In addition knowing, video4linux is not installed how is possible that the Pixel 3a is able to record video? I think an other driver is used... What is the driver installed? And in case, what is device file used?