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• How to add zoom transition effects using FFmpeg to a variable number of images ?

  13 mai 2019, par Mathematics

  How can I add add zoom transition effects using FFmpeg to a variable number of images ?

  I am able to create video from a variable number of images but I am not sure how to add zoom in and out transition effects between images :

   ffmpeg -framerate 1/5 -i img%03d.jpeg -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

  I found this,

  https://superuser.com/questions/1189246/ffmpeg-image-slideshow-with-zoompan-and-fade-in-out/1190199

  But problem is that images are hard coded in that example and I am not sure how to make it work for a variable number of images ?

• How to record playable video files in gstreamer even if recording is interrupted unexpectedly (e.g. power disconnects) ?

  16 septembre 2021, par Otter_warrior

  I have been recording video streams on my Jetson Xavier NX using a simple gstreamer pipeline such as this

  


  gst-launch-1.0 -v \
nvarguscamerasrc sensor-id=0 ! \
'video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1' ! \
nvv4l2h265enc ! 'video/x-h265, stream-format=(string)byte-stream' ! \
h265parse ! qtmux ! filesink location=video.mp4 -e


  


  All is working if the recording is interrupted by keyboard interrupt Ctrl + C, but if the recording is interrupted unexpectedly (e.g. power gets disconnected) the resulting file has no playable stream, even if the file size is correct.

  


  I know that mp4 recording needs to be stopped properly otherwise it won't have the necessary information at the end of the file, but I was wondering if there was any other gstreamer pipelines or final file formats that would allow for an H265 encoded video file to be playable even if the recording is ended unexpectedly.

  


  It would be good even if the recorded file needed to be converted before being playable (e.g. with ffmpeg), as long as the information can be recovered without having to go through non-free mp4 recovery tools.

  


• i can not set video duration in Zoom & Pan with Fade In/Out Transition

  4 octobre 2018, par Prashant Godhani

  I am new to ffmpeg. i am doing Zoom & Pan with Fade In/Out Transition on image to make video i used this script, but this is for 4 image and i want to only for single image so i have tried this command :

  ffmpeg -y -loop 1 -i 1.jpg -filter_complex "\
  
  [0:v]setpts=PTS-STARTPTS,scale=w='if(gte(iw/ih,1280/720),-1,1280)':h='if(gte(iw/ih,1280/720),720,-1)',crop=1280:720,setsar=sar=1/1,format=rgba,split=2[stream1out1][stream1out2];\
  
  [stream1out1]trim=duration=1,select=lte(n\,30),split=2[stream1in][stream1out];\
  
  [stream1out2]trim=duration=2,select=lte(n\,60)[stream1];\
  
  [stream1in]fade=t=in:s=0:n=30[stream1fadein];\
  
  [stream1out]fade=t=out:s=0:n=30[stream1fadeout];\
  
  [stream1fadein][stream1][stream1fadeout]concat=n=3:v=1:a=0,scale=1280*5:-1,zoompan=z='min(pzoom+0.002,2)':d=1:x='iw/2-(iw/zoom/2)':s=1280x720 ,format=yuv420p[video]" -map [video] -vsync 2 -async 1 -rc-lookahead 0 -g 0 -profile:v main -level 42 -c:v libx264 -r 30 df.mp4   

  It works fine but it generate 4 second video. So i’m confused about how to set video duration in this command.