The drawback is that it will also finish the seeking at some keyframe, not necessarily located at specified time (00:00:18.123), so the seeking may not be as accurate as expected. The input will be parsed using keyframes, which is very fast. If the -ss comes before -i, it will also produce one image frame (yosemite.png) somewhere around the 18 seconds from the beginning of the movie. The command will seek to the position of 0h:0m:18sec:123msec into the movie and extract one frame (-vframes 1) from that position into a yosemite.png file:

When we extract just one frame, we can opt out '-f image2' from the command above:įfmpeg -i yosemiteA.mp4 -ss 00:00:18.123 -frames:v 1 yosemite.png image2: to extract the frames in separate png files, we need to force the image2 muxer.vframes: set the number of video frames to record.In the user code I then can convert it to a numpy array, similarly to the examples you have.If we want to extract just a single frame (-vframes 1) from the video ( Yosemite) into an image file, we do:įfmpeg -i yosemiteA.mp4 -ss 00:00:18.123 -f image2 -vframes 1 yosemite.png I calculate the framesize based on the output node if given video_size and pix_fmt or if not given, using the fprobe and returning as width * highth * number of channels. Popen( args, stdin = stdin_stream, stdout = stdout_stream, stderr = stderr_stream) PIPE if capture_stderr or quiet else None p = subprocess. PIPE if input else None stdout_stream = subprocess. # calculate framezie framesize = _get_frame_size( stream_spec)

''' args = compile( stream_spec, cmd, overwrite_output = overwrite_output) ''' Invoke ffmpeg for the supplied node graph, streaming frame by frame. Output_operator( name = 'stream') def stream( stream_spec, cmd = 'ffmpeg', capture_stderr = False, input = None, quiet = False, overwrite_output = False):

Ffmpeg extract frames python