I've got an mp4 video and i would like to add a 5 seconds .png image i got as an intro (with a fadeout transition if possible) and also i got another two images i would like to add to the end of the video, one about 2 seconds and the other one 3 seconds (fades on this ones are optional).

I also need to scale down the images to 1280x720 to match the video resolution.

This is what i got so far for the intro image:

Code:
ffmpeg -itsoffset 5 -i video.mp4 -r 60 -loop 1 -i intro.png -filter_complex "scale=1280x720; [1:v] fade=out:125:25:alpha=1 [intro]; [0:v][intro] overlay [v]" -map "[v]" -map 0:a -acodec copy final.mp4
In case it is needed, the mp4 video format is the next:

Code:
Format                      : MPEG-4
Format profile              : Base Media / Version 2
Codec ID                    : mp42 (mp42/isom)
File size                   : 453 MiB
Duration                    : 10 min
Overall bit rate mode       : Variable
Overall bit rate            : 6 180 kb/s

Video
ID                          : 1
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L4.1
Format settings, CABAC      : Yes
Format settings, ReFrames   : 4 frames
Codec ID                    : avc1
Codec ID/Info               : Advanced Video Coding
Duration                    : 10 min
Bit rate                    : 6 001 kb/s
Width                       : 1 280 pixels
Height                      : 720 pixels
Display aspect ratio        : 16:9
Frame rate mode             : Variable
Frame rate                  : 60.000 FPS
Minimum frame rate          : 59.960 FPS
Maximum frame rate          : 60.040 FPS
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : Progressive
Bits/(Pixel*Frame)          : 0.109
Stream size                 : 440 MiB (97%)

Audio
ID                          : 2
Format                      : AAC
Format/Info                 : Advanced Audio Codec
Format profile              : LC
Codec ID                    : 40
Duration                    : 10 min
Duration_FirstFrame         : -17 ms
Bit rate mode               : Variable
Bit rate                    : 170 kb/s
Channel(s)                  : 2 channels
Channel positions           : Front: L R
Sampling rate               : 48.0 kHz
Frame rate                  : 46.875 FPS (1024 spf)
Compression mode            : Lossy
Stream size                 : 12.4 MiB (3%)
Title                       : Stereo
I'm asking with FFMpeg but if there is something easier like a graphical (free) software i can use, i don't mind switching to it.

Thanks!