Help with 3DS video format

[Mopeto]

Greetings! This is my first post.

Yesterday Nintendo put an update for the 3DS allowing to capture 3d Video with the console.
Checking the file we see that it uses 2 MJpg streams and a audio stream.



I was testing around and I can get 2 video stream at the resolution and the framerate, but I searched without any luck how to mux them in a single avi file.

Anyone know how to do it?

[Baldrick]

Have you tried avimuxgui? Add both videos, click on generate data source from files, select the video and audio tracks, start.

Or maybe they are using some special muxer. Can you play the avi with vlc and choose video tracks?

[Mopeto]

Tried that but I think it didnt work

General
Complete name                    : \test1.avi
Format                           : AVI
Format/Info                      : Audio Video Interleave
Format profile                   : OpenDML
File size                        : 13.2 MiB
Duration                         : 54s 250ms
Overall bit rate                 : 2 043 Kbps
Writing application              : AVI-Mux GUI 1.17.8.3, Feb 16 201019:42:50

Video
ID                               : 0
Format                           : M-JPEG
Codec ID                         : MJPG
Duration                         : 54s 250ms
Bit rate                         : 1 967 Kbps
Width                            : 480 pixels
Height                           : 240 pixels
Display aspect ratio             : 2.000
Frame rate                       : 20.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bits/(Pixel*Frame)               : 0.854
Stream size                      : 12.7 MiB (96%)

Audio
ID                               : 1
Format                           : ADPCM
Codec ID                         : 11
Codec ID/Hint                    : Intel
Duration                         : 52s 434ms
Bit rate mode                    : Constant
Bit rate                         : 64.0 Kbps
Channel(s)                       : 1 channel
Sampling rate                    : 16.0 KHz
Bit depth                        : 4 bits
Stream size                      : 418 KiB (3%)
Interleave, duration             : 227 ms (4.54 video frames)
Interleave, preload duration     : 256 ms
Title                            : sound

Info from MPC-HC



VLC Screencap

I tried several muxers but without any luck.

I saw there is this ffmpeg command line muxer but i dont know how to use it. Im in windows, could that work?

Thanks for your answer.

[Cornucopia]

Until I finish my coding (or someone steps in to help), you'll have to make due with either the old AVIMux.exe (tricking it by adding the 2nd video as if it was audio) -although this only works for short files-, or by using GraphEdit to build your own muxing process.

Scott

[Mopeto]

Thanks a lot Cornucopia1! That worked.
Using the video as WAV worked to mux the video but the file isnt recognized by the 3DS.

This is the video I created:

General
Complete name                    : D:\output.avi
Format                           : AVI
Format/Info                      : Audio Video Interleave
File size                        : 26.1 MiB
Duration                         : 54s 250ms
Overall bit rate                 : 4 033 Kbps

Video #1
ID                               : 0
Format                           : M-JPEG
Codec ID                         : MJPG
Duration                         : 54s 250ms
Bit rate                         : 1 967 Kbps
Width                            : 480 pixels
Height                           : 240 pixels
Display aspect ratio             : 2.000
Frame rate                       : 20.000 fps / 20.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bits/(Pixel*Frame)               : 0.854
Stream size                      : 12.7 MiB (49%)

Video #2
ID                               : 2
Format                           : M-JPEG
Codec ID                         : MJPG
Duration                         : 54s 250ms
Bit rate                         : 1 967 Kbps
Width                            : 480 pixels
Height                           : 240 pixels
Display aspect ratio             : 2.000
Color space                      : YUV
Chroma subsampling               : 4:2:0
Stream size                      : 12.7 MiB (49%)

Audio
ID                               : 1
Format                           : ADPCM
Codec ID                         : 11
Codec ID/Hint                    : Intel
Duration                         : 53s 504ms
Bit rate mode                    : Constant
Bit rate                         : 64.0 Kbps
Channel(s)                       : 1 channel
Sampling rate                    : 16.0 KHz
Bit depth                        : 4 bits
Stream size                      : 418 KiB (2%)
Interleave, duration             : 753 ms (15.07 video frames)

This is the output of a video recorded with the inside camera.

General
Complete name                    : K:\DCIM\101NIN03\HNI_0057_.AVI
Format                           : AVI
Format/Info                      : Audio Video Interleave
File size                        : 6.45 MiB
Duration                         : 10s 624ms
Overall bit rate                 : 5 090 Kbps

Video #1
ID                               : 0
Format                           : M-JPEG
Codec ID                         : MJPG
Duration                         : 10s 450ms
Bit rate                         : 2 511 Kbps
Width                            : 480 pixels
Height                           : 240 pixels
Display aspect ratio             : 2.000
Frame rate                       : 20.000 fps / 20.000 fps
Color space                      : YUV
Chroma subsampling               : 4:2:0
Bits/(Pixel*Frame)               : 1.090
Stream size                      : 3.13 MiB (49%)

Video #2
ID                               : 2
Format                           : M-JPEG
Codec ID                         : MJPG
Width                            : 480 pixels
Height                           : 240 pixels
Display aspect ratio             : 2.000
Color space                      : YUV
Chroma subsampling               : 4:2:0
Stream size                      : 3.22 MiB (50%)

Audio
ID                               : 1
Format                           : ADPCM
Codec ID                         : 11
Codec ID/Hint                    : Intel
Duration                         : 10s 624ms
Bit rate mode                    : Constant
Bit rate                         : 64.0 Kbps
Channel(s)                       : 1 channel
Sampling rate                    : 16.0 KHz
Bit depth                        : 4 bits
Stream size                      : 83.0 KiB (1%)
Interleave, duration             : 50 ms (1.00 video frame)
Interleave, preload duration     : 94 ms

I only see the Audio with "preload duration", that could be causing the video to not load... or a signature somewhere, I will hex-edit to look around.

[Cornucopia]

One thing you ought to try is take a copy of something that originally CAME from the 3DS (that you know works with it), and demux it to the raw streams. Then REMUX it using the hack I suggested. Then see what is different between the files. That will be more telling of what might not be set right...

Scott

[Mopeto]

Great idea, but im leaving work now, will try later at home.
Thanks a lot!

[Mopeto]

Oh, someone beat me to it, it was with ffmpeg.

http://www.elotrolado.net/hilo_tutorial-convierte-cualquier-video-3d-en-el-formato-de-la-3ds_1707979

Thanks for your replies