使用 PyAV 的视频中的帧数

Question

I use the library PyAV because it's one of the fatest available with Python.

Here is a simple example of code I would like to use:

import av

video = av.open("My_Super_Video.mp4")

total_frames = # ????

for i, frame in enumerate(video.decode(video=0)):
    img = frame.to_image()  # PIL image

    print("Frame: %d/%d ..." % (i, total_frames))

I could obviously use other libraries to load the library, however I would prefer using PyAV if possible due to its processing speed.

Question 1: Is it possible to obtain the number of frames with PyAV ? If yes, how ?

Question 2: In the case, I would consider using another library to load and process the video frame by frame. Which library would allow me to do the above with the highest speed as possible. I know the followings, but don't know how they compare:

1. PIMS On top of PyAV, could add some interesting feature ?
2. MoviePy (limited to videos which fit in RAM), but what about perf ?
3. Imageio (probably same limitation as above), but what about perf ?
4. OpenCV (probably same limitation as above), but what about perf ?
5. Others ?

Answer 1

To get the frames of the first video stream do:

container = av.open("My_Super_Video.mp4")
total_frames = container.streams.video[0].frames

Answer 2

You can get the number of frames in stream with Stream.frames attribute.

Source: http://docs.mikeboers.com/pyav/develop/api/stream.html#av.stream.Stream