joining mp4 videos

[juodas]

Hi,

I have 3 mp4 videos (with audio) that I want to join together.

I use MyMP4Box. However, the video turns out black.

Obviously there is some mismatch between the files that I'm, unfortunately, aren't aware of.

Here's some info:

1st file:

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 6 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1mn 41s
Bit rate                                 : 1 000 Kbps
Maximum bit rate                         : 2 963 Kbps
Width                                    : 848 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.102
Stream size                              : 12.2 MiB (89%)
Writing library                          : x264 core 130 r2273 b3065e6
Encoding settings                        : cabac=1 / ref=6 / deblock=1:1:1 /

2nd file:

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 8 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 20mn 44s
Bit rate                                 : 500 Kbps
Maximum bit rate                         : 1 871 Kbps
Width                                    : 848 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.051
Stream size                              : 74.2 MiB (82%)
Writing library                          : x264 core 65 r1074M b6bb3d4
Encoding settings                        : cabac=1 / ref=8 / deblock=1:1:1 /

3rd file:

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 6 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1mn 49s
Bit rate                                 : 1 000 Kbps
Maximum bit rate                         : 3 011 Kbps
Width                                    : 848 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.102
Stream size                              : 13.1 MiB (94%)
Writing library                          : x264 core 125 r2200 999b753
Encoding settings                        : cabac=1 / ref=6 / deblock=1:1:1 /

What do I need to look out for?

[aedipuss]

unless all the videos were part of a single encode to begin with joining is not likely to work. those 3 have different reference frames and are not close in bitrate.

re-encode them together - don't join.

[juodas]

Thanks for your reply!

The idea behind these three files: intro, main, outro.

I encoded the intro and outro to have the same reference frame value as 'main' as well as a bitrate.

Still, the video is blank.

Reencoding the 'main' is not an option since it takes time.

Dammit