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• Stack two video side and side but play one after another

  2 mai 2022, par user1087474

  I have two videos, that i want to concatenate side by side but second one should play after the first one is finished playing.
If the video is not playing, thumbnail should be shown

  


  Below is the example that i want to achieve using ffmpeg
https://twitter.com/sunmor2901/status/1520024861619658752

  


  I have used below command but both videos are runing simultaneously. Second, I also want to display a small text below the video describing what this video is all about (as seen in sample video link in question)

  


  ffmpeg -i 1.mp4 -i 2.mp4 \
  -filter_complex 
    "[0][1]scale2ref='ohmdar':'if(lt(main_h,ih),ih,main_h)'[0s][1s];\
     [1s][0s]scale2ref='ohmdar':'if(lt(main_h,ih),ih,main_h)'[1s][0s];\
     [0:a][1:a]amerge=inputs=2[a];[0s][1s]hstack,setsar=1" \
  -map "[a]" -ac 2 o.mp4


  


• ffmpeg how to vertically rotate and concat/stack two videos in one command ?

  3 juin 2022, par baziorek

  I have two recordings inside.MOV and outside.MOV recorded with two cameras (the same settings and the same model).

  


  ---

  


  I want to do something like that :

  


  ffmpeg -i inside.MOV -vf "transpose=2,transpose=2" inside_rotated180degree.MOV # rotate 180 degree
ffmpeg -i outside.MOV -i inside_rotated180degree.MOV \
  -filter_complex "[0:v]scale=640:-1[v0];[v0][1:v]vstack=inputs=2" inside_and_outside.MOV # concat them


  


  but in single command.

  


  I've managed to rotate upper video, but I need to rotate lower :

  


  ffmpeg -i outside.MOV -i inside_rotated180degree.MOV \
  -filter_complex "[0:v]scale=1920:-1,rotate=PI[v0];[v0][1:v]vstack=inputs=2" inside_and_outside.MOV


  


  ---

  


  I tried to modify the command various ways to add rotate=PI, but always there is a error in command/screen/input/... does anybody knows how to rotate video lower instead of upper ?

  


• [MPV][FFMPEG] stack two videos to play them synchronously without re-encoding, but with a rotation (from metadata) applied to one of them

  10 juin 2022, par publicIDI

  I have 3 videos with the same resolution (1920x1080), but one of them has the rotation property set in the metadata while the two others are reencoded in the correct orientation.

  


  I would like to stack them horizontally to compare their quality without re-encoding.
I know how to dynamically stack and display them with MPV, but not when one of them has a rotation metadata property :

  


  Two videos in parallel

  


  mpv --lavfi-complex="[vid1][vid2]hstack[vo];[aid1][aid2]amix[ao]" "v1_metadata.mp4" --external-file="v2.mp4"


  


  Three videos in parallel

  


  mpv --lavfi-complex="[vid1][vid2][vid3]hstack=inputs=3[vo];[aid1][aid2][aid3]amix=inputs=3[ao]" "v1_metadata.mp4" --external-files="v2.mp4;v3.mp4"


  


  Precisions

  


  v1_metadata.mp4 : rotation in the metadata

  


  

  


  v2.mp4, v3.mp4 : no metadata rotation

  


  

  


  How can I "apply" the rotation to the first video (v1_metadata.mp4) in order to display it stacked with the others ?

  


  Thanks,