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• FFmpeg how generate a sequence of videos with bash

  27 janvier 2018, par Massimo Vantaggio

  i try to write an .sh that read a folder create a playlist of mp4 files and then generate an only big video with a sequence of all videos find in the folder, and encode it for dash :

  printf "file '%s'\n" ./*.mp4 > playlist.sh
  
  ffmpeg -f concat -safe 0 -i playlist.sh -c copy concat.mp4

  Till now i follow the demux concat official guido to ffmpeg website.
  Without result, also the following give me "more than 1000 frames duplicated between videos of the sequence"

  ffmpeg -f concat -i playlist.sh -c:a aac -b:a 384k -ar 48000 -ac 2 -c:v libx264 -x264opts 'keyint=50:min-keyint=50:no-scenecut' -r 25 -b:v 2400k -maxrate 2400k -bufsize 1200k -vf "scale=-1:432 " out.mp4

  Thanks a lot

• ffmpeg create 2 videos from images with a consistent (exact same) duration

  3 septembre 2021, par danday74

  I have exactly 1500 jpg's named rgb_00000.jpg rgb_00001.jpg etc. Each image has dimensions 1920 x 1440 (aspect ratio 4:3). These images are sequential and represent someone filming a car.

  


  I have exactly 1500 png's named depth_00000.png depth_00001.png etc
Each image has dimensions 256 x 192 (aspect ratio 4:3). These images are sequential and represent a depth visual for the first set of images.

  


  From these 2 sets of images I want to create 2 videos with the exact same length. The user will then be able to flip between videos.

  


  So I ran this command to generate the first video

  


  cat depth_*.png | ffmpeg -y -f image2pipe -framerate 30 -i - -pix_fmt yuv420p -c:v libx264 depth.mp4


  


  Video created with success. Then I ran this command to output duration information

  


  ffprobe -v quiet -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 depth.mp4


  


  The duration was 51.534

  


  I then repeated these exact same commands on the jpg set of images. Again video was created with success. But this time the duration is 51.905

  


  Why is the duration different given an identical frame rate and image count ? How can I make it so that the duration is identical for both videos (to support jumping between them) ?

  


  Note : I don't want to just truncate the videos to the same length since then they would not be parallel and flipping / jumping between the videos would not be smooth

  


  Many thanks

  


• Need someone to write a batch shell script to watermark videos via ffmpeg [closed]

  21 janvier 2021, par Shiv Nandan

  I am using a batch shell script on windows server to watermark videos

  


  for %%a in ("X:\input older\*.mp4") do ffmpeg -i "%%a" -vf "movie=watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" "X:\output folder\%%~na.mp4"
pause


  


  It converts all videos from input folder to output folder. I want to...

  


  

  1. Change watermark location after every 10 seconds in video for all videos.

  


  2. Water mark size is perfect when video resolution is 19201080 but its different for low resolution video for example : 1280720 its large, and for 640*360 extra large. So I want to keep the water mark size fixed.