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  • How to trim multiple videos and position them to specific position using -filter_complex ?

    16 décembre 2023, par Pavlo Holotiuk

    How do I mix several videos and have them not overlap each other ?
I need to use -filter_complex as I cram many more commands there and seems weird how when I trim video its frames remain and overlap with the other video. I also use tpad to paint the video black where it supposed to be cut but it just makes black images to overlap with other videos instead.

    


    How do I trim and position videos with mix and make sure their frames do not overlap in result ?
Here's the version vithout tpad

    


    ./ffmpeg.exe -i input1.mp4 -i input2.mp4 -filter_complex "[0]trim=start=0:end=5[t0];[1]trim=start=5:end=10[t1];[t0][t1]mix=inputs=2" ./output.mp4

    


    It produces such overlapping frames
enter image description here

    


    When adding tpad overlapping changes to mix of frame and black image

    


    ./ffmpeg.exe -i input1.mp4 -i input2.mp4 -filter_complex "[0]trim=start=0:end=5[t0];[1]trim=start=5:end=10,setpts=PTS-5/TB,tpad=start_duration=5:start_mode=add:color=black@0x00[t1];[t0][t1]mix=inputs=2" ./output.mp4

    


    enter image description here

    


    The alpha in tpad doesn't seem to do anything either.

    


  • FFMPEG no audio in final output [migrated]

    16 juin 2015, par Maverick

    I have the following FFMPEG command working.

    ffmpeg -y -i slide.mp4 -f lavfi -i "color=c=black:s=1920x1080:r=25:d=1" -filter_complex "[0:v] setpts=PTS-STARTPTS [main]; \
    
 [1:v] trim=end=3,setpts=PTS-STARTPTS [pre]; \
    
 [1:v] trim=end=3,setpts=PTS-STARTPTS [post]; \
    
 [pre][main][post] concat=n=3:v=1:a=0 [out]" -map "[out]" output.mp4

    It appends black frames at the start and end of the video. However, the output file does not contain the audio from the input file.

    Any pointers to the problem will be highly appreciated.

  • ffmpeg combine existing filter_complex with upscaleto e.g. 720p

    24 novembre 2019, par Tom Meyer

    Currently I am combining two videos using this filter :

    -filter_complex "[1:v][0:v]scale2ref=main_w:ih[sec][pri]; [sec]setsar=1,drawbox=c=black:t=fill[sec];[pri][sec]hstack[canvas]; [canvas][1:v]overlay=main_w-overlay_w"

    The output is the following : test.png (Green is the first video input, orange the second one) The whole video (red) has a format of 1600x540 (That might change depending on the input sizes.)

    My question is whether there is a way to upscale this video to maybe 1920x1080 or 1280x720 in the same command. By upscaling I mean to change its size and to fittingly insert black bars on the side/top.

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