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• 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.

  


• How to bookmark a video, to skip the video to a cetain duration ?

  17 août 2016, par Prasanth Kumar Arisetti

  I am encoding the incoming camera data, using x264 encoder and mpegtsmux to a filesink .ts files.

  I am pushing the buffers to the pipeline, using, g_signal_emi_by_name.

  Pipeline is something like this :

  gst-launch-1.0 v4l2src ! videoconvert ! video/x-raw,width=720,height=576,framerate=25/1 ! x264enc ! mpegtsmux ! filesink  location=test.ts

  Now, for that video, i would like to add bookmarks for certain duration to directly skip the video to that duration, when click on that duration.

  How can i add bookmarks to that video ?