Raspistill: Some pictures are black











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I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command 



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library






python camera raspberry-pi raspistill







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  • Is the only purpose of the thread to copy the pictures to other place?,
    – Cheche
    Nov 15 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
    – Umar Dastgir
    Nov 15 at 2:01










  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
    – Cheche
    Nov 15 at 2:03










  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
    – Umar Dastgir
    Nov 15 at 2:09










  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
    – Cheche
    Nov 15 at 2:15















up vote
1
down vote

favorite












I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command 



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library






python camera raspberry-pi raspistill







share|improve this question






















  • Is the only purpose of the thread to copy the pictures to other place?,
    – Cheche
    Nov 15 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
    – Umar Dastgir
    Nov 15 at 2:01










  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
    – Cheche
    Nov 15 at 2:03










  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
    – Umar Dastgir
    Nov 15 at 2:09










  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
    – Cheche
    Nov 15 at 2:15













up vote
1
down vote

favorite









up vote
1
down vote

favorite











I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command 



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library






python camera raspberry-pi raspistill







share|improve this question













I have a raspberry pi on which I am executing a python script. This script has a while loop with the following statement in it



os.system('sudo raspistill -o img' + str(counter) +'.jpg')


This loop executes a 100 times and is supposed to take a hundred pictures (the counter number is incremented each time a picture is taken). I have verified that this code is working perfectly and the folder contains 100 pictures.



I added a background thread to execute in parallel. As soon as the main program snaps a picture and puts it in a folder, this thread copies this picture into another directory using the following command 



os.system('sudo cp ' + sourceFilePath + ' ' + destinationFilepath)


However, with this copying thread on, some of the pictures seem to be completely black (and the size is really small, around 150kb). Does anyone know what is going on?



NOTE: Due to some reason, I have to use the os.system('sudo raspistill -o ') command. I can not use the picamera library






python camera raspberry-pi raspistill




python camera raspberry-pi raspistill






share|improve this question













share|improve this question











share|improve this question




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asked Nov 15 at 1:48









Umar Dastgir

9810




9810












  • Is the only purpose of the thread to copy the pictures to other place?,
    – Cheche
    Nov 15 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
    – Umar Dastgir
    Nov 15 at 2:01










  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
    – Cheche
    Nov 15 at 2:03










  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
    – Umar Dastgir
    Nov 15 at 2:09










  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
    – Cheche
    Nov 15 at 2:15


















  • Is the only purpose of the thread to copy the pictures to other place?,
    – Cheche
    Nov 15 at 2:00












  • @Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
    – Umar Dastgir
    Nov 15 at 2:01










  • Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
    – Cheche
    Nov 15 at 2:03










  • Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
    – Umar Dastgir
    Nov 15 at 2:09










  • Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
    – Cheche
    Nov 15 at 2:15
















Is the only purpose of the thread to copy the pictures to other place?,
– Cheche
Nov 15 at 2:00






Is the only purpose of the thread to copy the pictures to other place?,
– Cheche
Nov 15 at 2:00














@Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
– Umar Dastgir
Nov 15 at 2:01




@Cheche Yes. For some reason, I have to copy the pics to the other place as soon as they get taken by the Camera
– Umar Dastgir
Nov 15 at 2:01












Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
– Cheche
Nov 15 at 2:03




Can't you just store them in the other folder os.system('sudo raspistill -o img' + 'homepics' + str(counter) + '.jpg')?,... seems you're patching some issue with you raspberry making something that won't be efficient at all...
– Cheche
Nov 15 at 2:03












Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
– Umar Dastgir
Nov 15 at 2:09




Unfortunately, I can not. Storing at this other location takes a lot more time and I have a time constraint (max time between two pictures should be less than a particular value).
– Umar Dastgir
Nov 15 at 2:09












Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
– Cheche
Nov 15 at 2:15




Ok, understand. What about a queue? The point is that thread is not convenient on certain kind of processes because python will still be single-threaded.
– Cheche
Nov 15 at 2:15

















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