Atlas 200I DK A2开发者套件内置案例第一个目标检测，视频保存下来只能用VLC打开，电脑自带的播放器打不开，应该是ffmpeg生成格式问题（参考：解决ffmpeg生成mp4文件不能正常预览的问题_mp4reader__无相_的博客-CSDN博客），修改为cv2保存可用自带播放器正常在本地展示。
原代码部分
def infer_video(video_path, model, labels_dict, cfg, output_path='output.mp4'):
"""视频推理"""
image_widget = widgets.Image(format='jpeg', width=800, height=600)
display(image_widget)
# 读入视频
cap = vreader(video_path)
video_writer = None
for img_frame in cap:
# 对视频帧进行推理
image_pred = infer_frame_with_vis(img_frame, model, labels_dict, cfg, bgr2rgb=False)
image_widget.value = img2bytes(image_pred[:, :, ::-1])
if video_writer is None:
# 初始化视频写入对象
video_writer = FFmpegWriter(output_path)
# 将每一帧的预测结果写入视频对象
video_writer.writeFrame(image_pred)
video_writer.close()视频打不开
VLC能打开
修改后（参考：Pyhon cv2.VideoWriter 保存视频_cv2保存视频_南洲.的博客-CSDN博客）
def infer_video(video_path, model, labels_dict, cfg, output_path='output.mp4'):
"""视频推理"""
# 读入视频
cap = cv2.VideoCapture(video_path)
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
fps = cap.get(cv2.CAP_PROP_FPS)
fourcc = cv2.VideoWriter_fourcc('M', 'P', '4', 'V')
outVideo = cv2.VideoWriter('save_test_video.avi', fourcc, fps, (width,height))
image_widget = widgets.Image(format='jpeg', width=800, height=600)
display(image_widget)
while True:
# 对视频帧进行推理
ret, frame = cap.read()
if not ret:
print("... end of video file reached")
break
image_pred = infer_frame_with_vis(frame, model, labels_dict, cfg, bgr2rgb=False)
image_widget.value = img2bytes(image_pred)
outVideo.write(image_pred)保存为avi格式，也能在jupyter中正常展示：文章来源：https://www.toymoban.com/news/detail-553702.html
文章来源地址https://www.toymoban.com/news/detail-553702.html
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