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• Give a video rounded transparent edges so that it can be overlayed on another video using FFMPEG

  30 septembre 2015, par Kevin Jasti

  Im trying to overlay a smaller video (200x200)on top of a bigger video (800x800).

  I’ve used the FFMPEG overlay filter to achieve this

      ffmpeg -i big.mp4 -vf "movie=small.mkv[clip2]; [in][clip2] overlay=1:5 [out]"  final.mp4

  Challenge is that the smaller video needs its edges to be rounded.
  I have tried working with alphaextract and alphamerge. The documentation on FFMPEG is sparse and im not sure how to go about it.

• FFMPEG Adding intro video and scaling it to the original video

  10 octobre 2019, par Questions

  I have one intro video of fixed resolution, 1920x1080, and main videos with different resolutions. I could merge the videos using the following command

  ffmpeg -i intro.mp4 -i main.mp4 -i intro.mp4 -filter_complex " \
  
  [0:v]scale=640x352,setsar=sar=16/9[intro]; \
  
  [1:v]scale=640x352,setsar=sar=16/9[video]; \
  
  [2:v]scale=640x352,setsar=sar=16/9[outro]; \
  
  [intro][video][outro]concat=n=3[output]; \
  
  [0:a][1:a] acrossfade=d=1 [audio]" \
  
  -vcodec libx264 -map "[output]" -map "[audio]" "main__.mp4"

  This works perfectly if I specify the scales manually. But this doesn’t work for portrait videos which has resolution of 640x352 with rotation of -90 degrees, when I check them with ffprobe.

  Is there a way to scale the intro video dynamically to match the dimensions of the main video ? It’s fine if the intro video’s aspect ratio is distorted, and just retain the main video’s size.

• How to add srt embedded subtitles from source video, to ouput hls playlist video ?

  2 mars 2023, par iarwain8a

  I have a source video "video.mkv" that has srt embedded subtitles, and I want to encode that file into an HLS playlist that is compatible with html5 video player.

  


  So far I got this :
ffmpeg -i <path> -map 0:s:1 -c:s:1 srt -f webvtt <hlsdir>/1subs.vtt -c:a aac_mf -b:a 128k -c:v copy -hls_time 7 -hls_list_size 0 -hls_segment_filename <hlsdir>/segment%d.ts <hlsdir>/playlist.m3u8 -loglevel debug</hlsdir></hlsdir></hlsdir></path>
What this line does, is extract and encode the subtitles at the same time, leaving them in the output folder, also it encodes the audio of the video to aac, and leaves the codec of the video as is.

  


  I tried a bunch of different commands with ffmpeg to no avail, a bunch of different errors came up.
I want to, in the same line, instead of just extracting the subtitles, to also be able to add them to the hls playlist, which I couldn't do.