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• FFMPEG : Overylaying multiple videos with offset

  4 novembre 2014, par user1064504

  I am trying to overlay multiple videos in a split screen, with different offset (Audio, video both offset), initially I tried offsetting & overlaying like following

  avconv -i 1.webm -itsoffset 2 -s 640x480 -vf "movie=1.webm, scale=320:480 [vid2]; [vid2] overlay=0:0 [basis1]; [basis1][1] overlay=320:0" splitScreenOut.mp4 

  & overlayed videos being offset by

  movie=overlay.avi:seek_point=1.4

  But this approach didn’t worked on my end, the -itsoffset offsets entire video output & seek_point wasn’t recognized by my ffmpeg build.

  Then I tried offsetting each video individually.

  avconv -itsoffset 4 -i 1.webm -c copy tmp1.webm

  & simply overlaying

  avconv -i tmp1.webm -s 640x480 -vf "[in] scale=640/3:480, pad=3.01*iw:ih [video0]; movie=tmp2.webm, scale=640/3:480 [video1];[video0][video1] overlay=(640)/3:0 [VidO1]; movie=tmp3.webm, scale=640/3:480 [video2];[VidO1][video2] overlay=(640/3)*2:0 [out]" -b:v 768k Output.webm

  The problem is all video start in split screen, from offset of first video as if individually offsetting didn’t worked.

• Use ffmpeg to concatenate a video and a timelapse

  26 décembre 2022, par tudors

  Input 1 : I used my phone to record a 25 fps movie with 1920x1080 resolution. There is sound.

  


  Input 2 : I used ffmpeg to create a timelapse movie i.e. 25 fps made out of 1920x1080 JPEGs. There is no sound.

  


  When I tried to concatenate them however, the result was a mess : It seems some fine detail is not matching between the two inputs, because the resulting video squishes the time lapse down to just 1 frame at the end.

  


  I have also tried this by first removing sound from video 1, so that both videos are soundless, and this does not give a different result.

  


  How can I tell ffmpeg that the two inputs are not incongruent, so as to achieve a correct 25 fps 1920x1080 video using all the frames from both inputs ?.

  


• Gphoto2 live view with nikon dslr5100 pipes to ffplay for 3 seconds then dies

  30 avril 2020, par Will Simpson

  I am trying to use my DSLR camera with OBS.
I have installed Gphoto2 on mac and have managed to get a connection to the camera.
Now I am trying to get some kind of live view window that I can then capture in OBS.

  



  The problem is when I use the following command, the camera makes like it is about to go into movie mode, the window opens and then the image begins streaming for usually about 4 seconds before it freezes.

  



  gphoto2 --port usb:250,006 --capture-movie --stdout | ffplay -i pipe:0 -vcodec mjpeg


  



  I specify the port because I also have my iphone camera in another window in OBS

  



  Does anyone have any suggestions ?