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| import atexit | |
| import time | |
| import subprocess | |
| from io import BytesIO | |
| import PIL.Image | |
| import numpy as np | |
| from matplotlib import pyplot as plt | |
| # S'assurer que le processus enfant se fait bien tuer, mais pas trop méchamment | |
| def cleanup(): | |
| timeout_sec = 5 | |
| if "process" in globals(): | |
| process.terminate() | |
| for s in range(10*timeout_sec): | |
| if process.poll() == None: | |
| time.sleep(0.1) | |
| else: | |
| break | |
| else: | |
| process.kill() | |
| atexit.register(cleanup) | |
| # Appeler FFMPEG | |
| # Sortie #1: fichier `output.mkv` avec 25fps | |
| # Sortie #2: ce script Python à 1fps | |
| cmd = ('ffmpeg -loglevel panic -y -f v4l2 -framerate 25 -video_size 640x480 -i /dev/video0 ' | |
| '-c:v libx265 -crf 28 -c:a aac -b:a 128k output.mkv ' | |
| '-vf "fps=1" -f rawvideo -pix_fmt rgb24 - ') | |
| process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, | |
| bufsize=10**8, shell=True) | |
| while True: | |
| # Lire l'image du pipe | |
| raw = process.stdout.read(640*480*3) | |
| if raw is not None: | |
| # Interpréter les octets | |
| im = np.fromstring(raw, dtype='uint8').reshape((480,640,3)) | |
| # Afficher juste pour le plaisir | |
| plt.clf() | |
| plt.imshow(im) | |
| plt.show(block=False) | |
| plt.pause(0.01) | |
| # Convertir en JPG pour envoi au serveur | |
| buf = BytesIO() | |
| PIL.Image.fromarray(im).save(buf, 'jpeg', quality=80) | |
| data = buf.getvalue() | |
| # Afficher la taille de l'image JPG en octets | |
| print(len(data)) | |
| else: | |
| # Relancer le processus? | |
| break |
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