Question about NVMS and MP4 (DVR video files)

theodirk · 12th May 2015, 16:20

I have a file that was taken from a customer DVR they installed and it claims to be a .MP4 file, yet will not work with any player that I have tested. However, the file does play in the included "MP4" player from Zmodo.

I have uploaded an example "MP4" and the Zmodo player software (210 MB) to:

http://www.megafileupload.com/12u4/MP4_Player.zip

http://www.filedropper.com/mp4player

Link to Zmodo Page with software under SAN4, SAN8, SBN4,SBN8, SBN6: http://kb.zmodo.com/index.php?action...=29&artlang=en

Could anyone help me figure out why it doesn't play in VLC or other real player and how to convert it to a real MP4? These types of files are common throughout the cheap chinese dvrs available on the market. It would be nice to have a way to view these files without having to download the individual "player" from each vendor.

Thank you.

foxyshadis · 13th May 2015, 10:38

Whatever it is, it's not an mp4. It has "MPG4" in the header, though, which led me to this blog post that exactly describes the file... unfortunately, a dead end for conversion. Eyeballing the hex view, it looks like a very thin wrapper around raw h.264, but you'd want a tool to extract that and I don't know of one.

feisty2 · 13th May 2015, 10:49

dump the h264 stream out from RAM directly when you are playing the file with whatever the heck player, maybe?

theodirk · 18th May 2015, 15:40

So, if it can be done as a raw h.264, how can I convert that into a real MP4?

Would the methods in this thread: http://forum.doom9.org/showthread.php?t=129096 work?

12th May 2015, 16:20	#1 \| Link
theodirk Registered User Join Date: May 2015 Posts: 2	Question about NVMS and MP4 (DVR video files) I have a file that was taken from a customer DVR they installed and it claims to be a .MP4 file, yet will not work with any player that I have tested. However, the file does play in the included "MP4" player from Zmodo. I have uploaded an example "MP4" and the Zmodo player software (210 MB) to: http://www.megafileupload.com/12u4/MP4_Player.zip http://www.filedropper.com/mp4player Link to Zmodo Page with software under SAN4, SAN8, SBN4,SBN8, SBN6: http://kb.zmodo.com/index.php?action...=29&artlang=en Could anyone help me figure out why it doesn't play in VLC or other real player and how to convert it to a real MP4? These types of files are common throughout the cheap chinese dvrs available on the market. It would be nice to have a way to view these files without having to download the individual "player" from each vendor. Thank you.

18th May 2015, 15:40	#4 \| Link
theodirk Registered User Join Date: May 2015 Posts: 2	If, then So, if it can be done as a raw h.264, how can I convert that into a real MP4? Would the methods in this thread: http://forum.doom9.org/showthread.php?t=129096 work? Last edited by theodirk; 18th May 2015 at 15:52. Reason: show link to other thread

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13th May 2015, 10:38	#2 \| Link
foxyshadis Angel of Night Join Date: Nov 2004 Location: Tangled in the silks Posts: 9,567	Whatever it is, it's not an mp4. It has "MPG4" in the header, though, which led me to this blog post that exactly describes the file... unfortunately, a dead end for conversion. Eyeballing the hex view, it looks like a very thin wrapper around raw h.264, but you'd want a tool to extract that and I don't know of one.

13th May 2015, 10:49	#3 \| Link
feisty2 I'm Siri Join Date: Oct 2012 Location: void Posts: 2,633	dump the h264 stream out from RAM directly when you are playing the file with whatever the heck player, maybe?