nsfw_detect: Use PyAV instead of ffmpegthumbnailer

This commit is contained in:
Mia Herkt 2022-11-29 21:46:33 +01:00
parent 14cfe3da58
commit eb0b1d2f69
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GPG Key ID: 72E154B8622EC191
2 changed files with 20 additions and 9 deletions

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@ -56,7 +56,7 @@ neural network model. This works for images and video files and requires
the following:
* Caffe Python module (built for Python 3)
* ``ffmpegthumbnailer`` executable in ``$PATH``
* `PyAV <https://github.com/PyAV-Org/PyAV>`_
Network Security Considerations

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@ -22,11 +22,12 @@ import numpy as np
import os
import sys
from io import BytesIO
from subprocess import run, PIPE, DEVNULL
from pathlib import Path
os.environ["GLOG_minloglevel"] = "2" # seriously :|
import caffe
import av
av.logging.set_level(av.logging.PANIC)
class NSFWDetector:
def __init__(self):
@ -49,7 +50,7 @@ class NSFWDetector:
self.caffe_transformer.set_channel_swap('data', (2, 1, 0))
def _compute(self, img):
image = caffe.io.load_image(BytesIO(img))
image = caffe.io.load_image(img)
H, W, _ = image.shape
_, _, h, w = self.nsfw_net.blobs["data"].data.shape
@ -71,13 +72,23 @@ class NSFWDetector:
def detect(self, fpath):
try:
ff = run([
"ffmpegthumbnailer", "-m", "-o-", "-s256", "-t50%", "-a",
"-cpng", "-i", fpath
], stdout=PIPE, stderr=DEVNULL, check=True)
image_data = ff.stdout
with av.open(fpath) as container:
try: container.seek(int(container.duration / 2))
except: container.seek(0)
scores = self._compute(image_data)
frame = next(container.decode(video=0))
if frame.width >= frame.height:
w = 256
h = int(frame.height * (256 / frame.width))
else:
w = int(frame.width * (256 / frame.height))
h = 256
frame = frame.reformat(width=w, height=h, format="rgb24")
img = BytesIO()
frame.to_image().save(img, format="ppm")
scores = self._compute(img)
except:
return -1.0