IMM4 Codec and MEncoder

This has been on the ‘to do’ list for a little while. It’s time to grab a coffee and get to grips with MEncoder in order to deal with footage encoded using the IMM4 Codec.

There appear to be a number of DVR’s that utilise the Infinity encoding chip. As such it is difficult to specify manufacturer or DVR Model. It is highly likely though that each manufacturer, or should I say system builder (most don’t actually make anything themselves), utilise the same SDK’s, so the playback functionality should be pretty common to those dealing regularly with CCTV Footage.

The folder structure, either on disk or USB Device, is pretty simple.


We have a player, the video footage inside an avi container,  a text file detailing the export process and one detailing the Motion Detection activations. We also have a set-up file to install a codec.

Looking at the player first, when it runs, I notice a small uncompressing dialogue box appear. By looking at this, it reveals that this is just a self executing file to uncompress the player into my C:\Temp folder. Looking in here reveals the actual player. By looking at its properties, I find a few issues that cause a little concern.


With little information, I am not going to be installing any codec into my working machine that has the likelihood of screwing it up! I will leave the codec install until later – and within a Virtual machine.

Now we know where the player is, I can copy all these files out and save them into a new folder for permanent usage without having to extract every time. Opening the player and loading the video hits another problem.


The player’s video overlay functionality doesn’t like Windows 7. I can see the information such as resolution, date and time etc. but no video. Time to hit the Virtual Machine.

Running the player in a WinXP SP2 VM produced a similar problem, although this time the video screen was black. I have seen this before when using Virtual PC’s and always suggests a graphics issue with the playback program. Whilst in the VM though I can take a look at the codec install.

I have started to log what is being done when I install certain types of software. This helps in identifying what is going where and what is being changed.  Check out Whatchanged.exe

By installing the codec, I could review the footage easily in Virtualdub, identifying the mpeg4 structure and the inclusion of duplicate frames. By analyzing the results from whatchanged.exe I could see that the codec installed was VCMIMM4.dll and this was in the Windows/System32 folder. The registry was also updated and the codec was registered with the windows media handler. It’s this registering that often screws up a system when installing proprietary codecs.

At this point I needed to attempt two things. Firstly to get the footage playing within its player in Win7 and then to figure out how to deal with the video.

I copied the .dll codec file out of the virtual machine and did a bit of research.

It turned out that this codec is supported within Mplayer!

Mplayer is able to play files independently due to having its own Codecs folder. By placing the VCMIMM4.dll file into this folder and then opening the avi file within Mplayer, it played in Win7 without the need to install the Codec. I actually used the standalone SMplayer GUI found in my software pack but it will work in any flavour of the software.


Next it was onto the proprietary player in order to visualise the date/time overlay along with the video.

Back to the Virtual machine again, I installed the latest Network client for the DVR where this export originated from. Part of the install included an archive player that was an updated version. It is not available by itself but comes built into the client. By removing this part only from within the Virtual Machine, it could be used for standalone playback within Win7.

new player


So, we are getting somewhere now….. we can play it within its player, we can see it within Vdub and deal with its information within a Virtual PC and we can play it using Mplayer within Win7 by using its .dll codec.

From running a few tests I was concerned with the fact that the video was being presented in all software as 704×576 however the overlay information revealed 352 x 288. When using the Backup Player, it produces still images at 640×480! It turns out, after extensive research, that the video is recorded by the DVR at 352 x 288 but it is exported at 704 x 576. THERE IS NO WAY TO GET AROUND THIS. It happens automatically during export from within the DVR! You need to be aware of this horrendous issue. Again, who comes up with these ideas?

Lastly, as we can now deal with the video, is it possible to get this into some understandable format for investigative use without the need for a VM?

MEncoder can also read the .dll files that are acceptable to Mplayer. As a result it is possible to deal with the video from the command line using MEncoder.

16/05/13 MEncoder Update – I was informed today that things are now slightly different with the Windows builds. Upon checking there is a new method to compile Windows .dll codecs. I will get around to doing a new MEncoder guide but in the meantime I have placed an older version with the Codecs.conf file in my shared box. It’s on the right side in the widget!!

I used the latest MEncoder build and then worked out the following command:

mencoder input.avi -endpos 200 -ovc raw -ffourcc RGB -nosound -of avi -noskip -vf decimate=-0:99999,scale=352:-2,flip -o output.avi

Breaking this down:

mencoder > use mencoder

input.avi > the file to be transcoded

-endpos 200 > this was a test file so wanted to end the transcode after 200 seconds

-ovc raw > Output Video Codec as Raw Uncompressed Video

-ffourcc RGB > add fourCC code RGB

-nosound > Don’t include audio

-of avi > Output Format AVI

-noskip > Do not skip frames

-vf decimate=-0:99999,scale=352:-2,flip > This is a list of three filters. It starts with a decimate filter detailing that if the frame is the same as the previous one, it can be removed. Then it is scaled back to its original size. Finally it is flipped. This was found to be necessary as the transcoding process reversed the image.

-o output.avi > your file to be created.

After successful testing, I identified the period of interest with Mplayer and then changed my command to:

mencoder input.avi -ss 38:00 -endpos 60 -ovc raw -ffourcc RGB -nosound -of avi -noskip -vf decimate=-0:99999,scale=352:-2,flip -o output.avi

The -ss means start seek, so I have stated that the encode starts at 38mins and lasts for 60 seconds (-endpos 60). Remember that this is 60 seconds of video time and not realtime. The player indicates that it should be 12FPS. I could add in to the command -f 12, but I prefer to do this during any presentation transcode and not for frame / image analysis.

I now have an uncompressed, frame only video clip that can be reviewed in Vdub frame by frame and exported to image sequence if necessary.


As this was transcoding at 150+ FPS, this is a very fast way to get the video you require from a large IMM4 based AVI.

To help, I have packaged up the two players, original and new, along with the .dll file and the codec install. It is in my BOX shared files.

Update: This zip file now includes another version of the player that supports the IMM5 and IMM6 Codecs. Also included are the dll files for those Codecs and the Codec installs.

IMM Pack

IMM Pack

I have found Mencoder to be another really handy tool and learning some of the commands will surely come in handy in the future. It’s ability to read VFW dll’s makes it very versatile.

See Portable SMplayer with Codecs preconfigured for further help.

If you have audio or only require a basic Video DVD copy then this may help. IMM Update

By Spreadys Posted in EEPIP

16 comments on “IMM4 Codec and MEncoder

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    • I dont think so. Most surveillance video is Windows based so you will need to deal with them in windows first before moving over into the Mac environment. You could use a virtual environment using Virtualbox if you have a copy of windows at hand. Then use the codecs to enable decoding. Transcode to uncompressed mov and then drag over into MAc OSX.
      Good luck

  5. I was having a heck of a time finding a codec to run some surveillance footage and I found your IMM4-5-6 codec download. The files I had included a copy of backupplayer.exe but the file would not play the video. Went through three software packages before I found your simple player and codec box… worked perfectly.

    Thank you for posting it!


    • No problems Michael, glad it helped. I just wish CCTV manufacturers realised that after recording something important, people actually have to play it, interpret it and perhaps share that footage with others.. Perhaps one day eh?

  6. Thank you for this tutorial.
    After applying the same steps (appropriate for my file) the video plays back much faster than the original. Is there a way to correct this?
    Thank you!

    • Hi there T.

      There are a number of issues that can cause a frame rate change or inconsistencies. The first one, is that the original use Video Motion Detection (VMD) and when the native player is used, this is accounted for. Obviously, if this is ignored, It all gets rendered at a constant rate – usually faster!

      The mencoder command removes duplicates. As a result it changes the playback speed. You could try removing the decimate filter from the command.

      Mencoder is using its default frame rate. you may need to add in a frame rate as mentioned in the tutorial, “The player indicates that it should be 12FPS. I could add in to the command -f 12, but I prefer to do this during any presentation transcode and not for frame / image analysis”.

      Hope that gives you some direction, if not – email me using the link on my business site

  7. Thanks for this post. I have Lorex imm4 avi videos and they play in their proprietary players and wmp with subtitles (date and timestamp) after installing the codec in Windows 7. It also plays on Smplayer but I can’t get the subtitles to work. I need to review hundreds of large files that I do not want to have to reencode and I need to view them in a player with playback features that smplayer and vlc player have. It won’t play in vlc at all. It plays in smplayer but I don’t see the timestamp subtitles. I absolutely need the timestamp subtitles.

    Is there a way to either play on vlc with subtitles and no reencoding(most ideal) or a way to get smplayer to show the subtitles (close to ideal)?

    I don’t know how AVI containers work. Do they have a hidden subtitles file within them that I can extract and manually point SMPlayer to?

    • Hi there
      As you have installed the codec, things should be a little easier for you.
      I presume you want features such as frame FW, BW etc and perhaps speed of playback.

      VLC and SMplayer use their own libraries. You need a player that will utilise your directshow framework as you have installed the codec.

      My recommendations would be (apart from Amped FIVE)..

      1. Virtualdub with the directshow Input driver (you can download my Vdub pack from my shared files – PW = validate)
      2. Forevid. When you open a video, there is a selection box for file type – select directshow.
      3. Most Non Linear Editors will be capeable of reading the files.

      The subtitles in IMM4,5 and 6 AVI’s are not in a standard format. You are correct that it is possible to extract subtitle streams – but only when the CCTV manufacturer has used common sense and kept with standards…. but that’s rare!

      Hope this helps a little

      • Thanks for your reply. To be clear:
        1. There is no way I can get the subtitles/timestamp to work on SMplayer
        2. There is no way I can get the file to even play on VLC player

        The playback features that I absolutely need are the ability to change playback speeds from less than 1x to up to ~10x using a keyboard shortcut/hotkey (not a GUI slider), the ability to play and pause using a hotkey, & showing timestamp/subtitles. The additional features of VLC and SMplayer that I like and could use are the ability for multiple instances playing different files, the ability to flip and reflect, the ability to create playback loops, the ability to step frame by frame, the ability to change image quality features without reencoding, and their great set of hotkeys.

        Why is it that windows media player has no trouble with this and the subtitles?

        It is unclear from descriptions and videos of the players you suggested if hotkeys exist for playback speed, play/pause, etc. Forevid seems to be no longer developed as their website is practically blank.


    • If you have installed the IMM5 codec , then the easiest way is using then any player that can also convert. Virtualdub can do it, as along as you have the directshow input driver installed, allowing access to directshow codecs.
      By following the instructions above though you can avoid this and simply convert it.

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