Problem converting combined motion jpeg and mp4 audio file into other forma

[Anonymous3]

Hi there, I have an IP Camera which I have configured to record video.
The files it produces are 1min in length and .mp4 extension.

I am trying to join the files together and then after that hopefully use some software to output a file that only contains only every 20th frame.

The problem I am having is that every single piece of software that I have found online that has the functionality to join mp4 files throws an error with these particular files. I have tried around 10 different programs after extensive google searches.

According to the codec info from VLC media player, the file has 2 streams, Stream 0 is mp4a audio 16000hz, Stream 1 is Motion JPEG video (jpeg) at 1600 x 1200 resolution and frame rate of 0.999209 (this matches up with how the camera is configured)

I would greatly appreciate any assistance in dealing with these files.

[Baldrick]

Can you post a sample?

[Anonymous3]

sure can. Please see attached.

[Baldrick]

Hmm. You are right. Nothing works.


Or maybe VLC, it can convert.

[Selur]

MP4box -cat "Path to first file" -cat "Path to next file" "Path to output file"

seems to work fine here to join such files.
made a second copy of the first to test:

mp4box -cat  "c:\Users\Selur\Desktop\1.mp4" -cat  "c:\Users\Selur\Desktop\2.mp4" "c:\Users\Selur\Desktop\compine.mp4"

[Anonymous3]

Thanks for that Selur. Did the combined file display correctly?

If it did, I guess my next question is does mp4box have the ability to output a file from another file that only contains every x frames? i.e to create a speeded up version of the first.

[Selur]

seems to play fine,... uploaded to: http://www.megaupload.com/?d=AHJSJA5X
(also just made a fix to the command line call, needs to be '-cat' not '-add' )
mp4box can't do any video editing so it can't change the frame count, only think you could do with mp4box would be to change the frame rate of the video,..

[Anonymous3]

joining the files worked correctly. Now if only I could find a convertor to put them in a format that HandyAVI can understand.

[Selur]

Never used HandyAVI (to be frank it's the first time I even heard of it), if you have some infos what format HandyAVI support, it's probably not really hard to use i.e. mencoder or ffmpeg to convert the file.

[Cornucopia]

You know, a framerate of "0.999209..." is awfully close to 0.999000999 which is 1FPS * 1000/1001. This is just like the B/W -> Color dropped frame adjustment. Maybe, if you set the camera's FPS to = 1 (exactly), then more apps would be able to handle it, and you could make corrective changes down the road if you truly needed to.
However, I would bet that QTPro should handle this (the MJPEG+AAC in MP4), although it wouldn't be able to do the bit about keeping only the 20th frame.

An alternative might be to convert in QTPro from MJPEG @ 1fps (aka 60 Frames/minute) to a BMP picture sequence. Then create a script which deletes all but the 20th frame (aka 20th second) in the temp folder. Then you re-constitute a movie file using the now-corrected 1/20th fps setting. I've done this before in QTPro, so I know it can be done.

I can see you having trouble though with the partial end frames (the part where the sound lasts 18 frames at the end and it doesn't match where the video now lasts 20 frames - that shouldn't matter if the clip TRULY is exactly 1 minute long)...

Scott

[Webtasarim]

Hello

My problem Videora Ipod Video Converter error code: 100301



Please help me ?

[poisondeathray]

I don't think he's worried about audio ? If you're selecting every 20th frame ?


Oner option is to use avisynth and ffms2, it will work on your files that have been re-wrapped with mp4box, but not the original files. You can join them with avisynth too

If you want every 20th frame:

ffvideosource("video.mp4")
selectevery(20)
assumefps(1)

[Webtasarim]

Thank you for your reply.I examine the links

[poisondeathray]

Thank you for your reply.I examine the links

SOrry, my reply was for the original topic

Are you trying to convert to a format suitable for ipod?

Try a different converter like handbrake , xmedia recode, or mediacoder - I think they have ipod presets

[Webtasarim]

yes ipod for.

Thank you poisondeathray

[redwudz]

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[Anonymous3]

Thank you for all your suggestions. I tried mencoder, ffmpeg, mp4box, qt pro, plus about 10 other programs, nothing can handle the files. Oh well.
At least I know how to do the second part now thanks to poisondeathray!

[poisondeathray]

cezary - avisynth and ffms2 can handle the files if the original files have been re-wrapped with mp4box

So I would batch re-wrap with mp4box (make a batch script, a dos .bat file)

You can do the joining in avisynth and select every 20th frame

e.g

a=ffvideosource("video1.mp4")
b=ffvideosource("video2.mp4")
c=ffvideosource("video3.mp4")
.
.
.
a+b+c+....

SelectEvery(20)
AssumeFPS(1)


You feed that .avs file into any encoder that accepts avs scripts (there are many, it depends what you file format goal is)

[Selur]

Thank you for all your suggestions. I tried mencoder, ffmpeg, mp4box, qt pro, plus about 10 other programs, nothing can handle the files.

Strange I can join the files with mp4box and reencode with ffmpeg without a problem,...
Personally I would join them with mp4box and open the output with ffmpeg, drop the audio (it's not really worth to do a speedup there) and reencode the video with a output framerate of 20fps,..

Cu Selur

Ps.:
1. if you extract the raw video track with mp4box:

MP4Box.exe -add combine.mp4#video -raw 1 -new d:\test.jpg

and mux the raw stream with:

MP4Box.exe -add test.jpg#video:fps=20 -raw 1 -new d:\speedUpRemux.mp4

the output plays at 20fps.
2. if you take a hex editor and change the 'mp4v' ot 'mpjg' mplayer can playback the files, without changing the fourcc ffplay is the only crossplatform tool that can play these files.

[Anonymous3]

I think the problem may lie with me being lazy and using the gui versions rather than going for command line. Selur, I assume you were using command line of mp4box and ffmpeg?

[Anonymous3]

Also, thank you so much for posting those instructions, I'll be trying them out on Monday morning.

[Selur]

yup, I normally use the command line (or write a tool that does it for me )
btw. mplayer just got patched to handle these file for playback, withput the need of the hex editor changes, see: http://forum.doom9.org/showthread.php?t=162274

Cu Selur

[Anonymous3]

ok so I used those 2 commands in mp4box and created a file called speedUpRemux.mp4. It's not sped up in any way though. Selur did it work for you?

[Anonymous3]

oh now I see why, it's doing what it is meant to. I actually want the video to be sped up (i.e for example only using the every 20th frame of the original), which is different to 20fps.

[Anonymous3]

I'm going to try re-wrapping them first in mp4box and then using AviSynth as suggested by poisondeathray.

[Anonymous3]

Well good news, finally got it to work. I'll post the steps that I used for future reference in case anyone has the same issue.

1. wrapped the files in mp4box using the following commands;

MP4Box.exe -add combine.mp4#video -raw 1 -new d:\test.jpg
MP4Box.exe -add test.jpg#video:fps=20 -raw 1 -new d:\output.mp4

2. Used a hexeditor to change 'mp4v' to 'mpjg'. (I'm not sure if this is necessary, but I haven't tested the procedure without it)
3. Using AviSynth I wrote a script with 'ffvideosource("output.mp4")' and then used WinFF to convert the file to AVI.

4. Used another script with 'AviSource("output.avi").AssumeFPS(60, true)' and again ran it with WinFF.

[Selur]

Why the reencode?
if you:
1. join all files that need to be joined with

MP4box -cat "Path to first file" -cat "Path to next file" combine.mp4

(add additional -cat "Path to Xst file" before "Path to output file" to join more files)
2. extract the videostream

MP4Box.exe -add combine.mp4#video -raw 1 -new d:\test.jpg

3. create a newMp4 files form the videostream

MP4Box.exe -add test.jpg#video:fps=20 -raw 1 -new d:\output.mp4

4. use a hexeditor to change 'mp4v' to 'mpjg'.

This should result in a file with the videostream @60fps. (works here, no need to reencode at all)

Cu Selur

[Anonymous3]

I was converting it so that I could use the command

"AviSource("output.avi").AssumeFPS(60, true)"

which didn't work for .mp4 files.

However I just tried

ffvideosource("test.mp4").Selectevery(100)

, which worked great. Actually better because the file size produced is much smaller.

[Selur]

.AssumeFPS(60, true) -> changes frame rate
.Selectevery(100) -> drop frames (only takes each 100th frame)

[Anonymous3]

When I use the command

MP4box -cat "Path to first file" -cat "Path to next file" combine.mp4

On two files, both of which are exactly 1 min in length, the resulting file comes out to be 3 minutes. I'm not sure what's happening.


It seems the first file is repeated twice followed by the second file.