How can i read mjpeg video?

Hello, I'm struggling with reading mp4 files.

I firstly had an error using VideoReader to read my video file(.mp4). After i downloaded Windows Media Codec, I don't get the error message. But the Numframe is empty.

Filename = 'world.mp4';

vid = VideoReader(Filename)

vid =

VideoReader - 속성 있음:

일반 속성(general):

Name: 'world.mp4'

Path: 'C:\Users\Lee\Desktop\Content\VD\code'

Duration: 180.3010

CurrentTime: 180.3010

NumFrames: <계산 중(calculating)...> 자세히 알아보기

비디오 속성(video):

Width: 1280

Height: 720

FrameRate: 59.9402

BitsPerPixel: 24

VideoFormat: 'RGB24'

So I used

info = mmfileinfo('world.mp4')

and it says that the video format is 'mp4v' and i haven't heared of this.(I guess that this video is Motion JPEG, but i am not sure)

Which code should i use to decode mjpeg video? ( or if i have to use ffmpeg, can you please tell me what should i do?)

Answer 1

[Chidvi Modala]

'updateTimestamp' is not triggered in Linux which is why isNumFramesAvailable is 0. And that is the reason why NumFrames is always showing 'calculating'

On Linux, computation of timestamps results in frame decoding which might lead to performance regression in few cases. Computation is deferred until timestamps are needed. On Windows and Mac, timestamp generation does not affect performance as no frame decoding is done. Based on platform, appropriate value is passed to VideoReader.

[Siwoo Lee]

thanks for replying. I solved this problem using python :D thank you