ffmpeg combine videos, stretch the lower quality

[kucing]

hi, sorry for my bad English,
I like to combine 2 or more videos,
but sometimes a video has a larger dimension,
for example a 1080p video combine with 720p video,
I like to make the 720p is stretch to 1080p (the height and the weight),
but because I like to make it automatic,
is there any code to do this?
(you do not need to type the height and the weight every time)


thank you, have a nice day

[october262]

hi, sorry for my bad English,
I like to combine 2 or more videos,
but sometimes a video has a larger dimension,
for example a 1080p video combine with 720p video,
I like to make the 720p is stretch to 1080p (the height and the weight),
but because I like to make it automatic,
is there any code to do this?
(you do not need to type the height and the weight every time)


thank you, have a nice day

to combine videos, see here - https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
to Resize/Scale/Change Resolution of a Video, see here - https://ottverse.com/change-resolution-resize-scale-video-using-ffmpeg/

[kucing]

@ october262 thank you for the reply,
can you explain what this code does?

-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] \
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]"

my biggest problem is what I must to do to stretch lowest dimension video

[october262]

@ october262 thank you for the reply,
can you explain what this code does?

-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] \
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]"

my biggest problem is what I must to do to stretch lowest dimension video

use the scale filter to stretch the video - https://trac.ffmpeg.org/wiki/Scaling

[kucing]

thank you again october262,
-I can scaling
-I can concatenating
my problem is to do both tasks simultaneously,
can you provide a working command?

and another task is wise to do 2 step separaty?:
1. scaling lower resolution video to large video
2. concatenating large resolution video with the scaled video

[october262]

thank you again october262,
-I can scaling
-I can concatenating
my problem is to do both tasks simultaneously,
can you provide a working command?

and another task is wise to do 2 step separaty?:
1. scaling lower resolution video to large video
2. concatenating large resolution video with the scaled video

try the -filter_complex https://programmierfrage.com/items/how-to-run-multiple-ffmpeg-tasks-in-php-shell-exec

[kucing]

i tried multiple times for hours
-input error,
-filter error,
-no error, output file unplayable,
-no error, output file playable, double video size, only the first video appear