opencv和ffmpeg查詢視訊資訊(python)
阿新 • • 發佈:2020-09-01
1. 用Opencv獲取
def get_source_info_opencv(source_name): return_value = 0 try: cap = cv2.VideoCapture(source_name) width = cap.get(cv2.CAP_PROP_FRAME_WIDTH ) height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT) fps = cap.get(cv2.CAP_PROP_FPS) num_frames = cap.get(cv2.CAP_PROP_FRAME_COUNT) return_value = {"width" : int(width), "height": int(height), "num_frames": int(num_frames), "fps" : int(fps) if not fps == float('inf') else 15} # print("width:{} \nheight:{} \nfps:{} \nnum_frames:{}".format(width, height, fps, num_frames)) # show_statisrics(source_name, fps, width, height, num_frames) except (OSError, TypeError, ValueError, KeyError, SyntaxError) as e: print("init_source:{} error. {}\n".format(source_name, str(e))) return_value = -1 return return_value
2. 用ffmpeg獲取
注意python執行如下程式碼有兩個條件:
- pip install ffmpeg-opencv
- 在系統安裝或者編譯ffmpeg(windows、linux、macos)
def get_source_info_ffmpeg(source_name): return_value = 0 assert os.path.exists(source_name) try: info = ffmpeg.probe(source_name) # print(info) # print("---------------------------------") vs = next(c for c in info['streams'] if c['codec_type'] == 'video') format_name = info['format']['format_name'] codec_name = vs['codec_name'] duration_ts = float(vs['duration_ts']) fps = int(vs['r_frame_rate'][:-2]) width = vs['width'] height = vs['height'] duration = int(float(vs['duration'])) # 如果只用ffmpeg,這裡不應該使用Opencv cap = cv2.VideoCapture(source_name) num_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT)) if cap.get(cv2.CAP_PROP_FRAME_COUNT) else \ duration * fps return_value = {"width": width, "height": height, "num_frames": duration * fps , "fps": int(fps)} show_statisrics(source_name, fps, width, height, num_frames) # print("format_name:{} \ncodec_name:{} \nduration_ts:{} \nwidth:{} \nheight:{} \nfps:{}".format(format_name, codec_name, duration_ts, width, height, fps)) except (OSError, TypeError, ValueError, KeyError, SyntaxError) as e: print("init_source:{} error. {}\n".format(source_name, str(e))) return_value = 0 return return_value
3. 資訊列印
def show_statisrics(source_name, fps, width, height, num_frames): print("Video statistics:") print(" ----------------------------------------") print(" Items | Info ") print(" ----------------------------------------") print(" Path | {:>20s} ".format(source_name) ) print(" width | {:20d} ".format(width) ) print(" height | {:20d} ".format(height) ) print(" num_frames | {:20d} ".format(num_frames) ) print(" fps | {:>20d} ".format(fps) ) print(" ----------------------------------------")
效果如下: