how can you distinguish mjpeg from mpeg4?

[si_kungs 0]

how can you distinguish mjpeg format from mpeg4 format?

[thewireguys 3]

Are you asking if you can can tell the difference between MJEG and MPEG-4 by looking at the video?

[si_kungs 0]

yes sir. so we can check if the supplier has the correct specification.

[jhonovich 0]

I am not sure if there is a definitive way to tell by looking at the video.

 

One indicator would be the level of 'crispness' of the video. MJPEG is almost always more crisp and 'photo-like' than MPEG-4, because of the more aggressive compression in MPEG-4.

 

Also, if you could examine the source files of the video on the system, the extension might provide an indicator.

 

Finally, if you have a box open it up and check the model and manufacturer of the encoder card.

 

Best,

 

John

[si_kungs 0]

thank you sir. so i need to record the image and check the source file. from there i can see if it is mpeg4 or mjpeg?

[chanyickwai 0]

how can you distinguish mjpeg format from mpeg4 format?

 

Previously, a gentleman suggest this handy tool.

 

http://www.videolan.org/vlc/

 

or you can record the files and view the header.

[chad_cooper 0]

If you are looking at the source files. The MJPEG files can be individually opened with a straight media player or paint program as a still frame. Since the mpeg4 file is a conditional refresh type of file the MPEG4 file will be in a .RAW format and must be opened in a streaming player it might not be in a mpeg4 file type.

[jasonkkn 0]

might i add - usually MJPEG will require more bandwidth to transmit the same amount of video (same FPS, same resolution) as compared to MPEG4.

 

the ration can range from 1:2 to 1:4 (MPEG4: MJPEG).

 

 

 

Another (not so strong) indicator could be the processing power used when viewing the video streams. MPEG4 will require slightly more PC processing power as compared to MJPEG.