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• I cant give names to subtitle tracks with ffmpeg

  11 mai 2023, par Keles

  Im using this command to add 2 audio tracks (mixed with original audio) and 2 subtitles tracks to the original video :

  


  


  ffmpeg -i input_video.mp4 -i audio_track_1.wav -i audio_track_2.wav -i
srt_file_es.srt -i srt_file_en.srt -filter_complex
"[0:a][1:a]amerge=inputs=2[a1] ;[0:a][2:a]amerge=inputs=2[a2]" -map 0:v
-map "[a1]" -metadata:s:a:0 language=spa -metadata:s:a:0 title="Spanish" -map "[a2]" -metadata:s:a:1 language=eng
-metadata:s:a:1 title="English" -c:v copy -c:a aac -ac 2 -b:a 96k -c:s mov_text -metadata:s:s:0 language=spa -metadata:s:s:0 title="Spanish"
-metadata:s:s:1 language=eng -metadata:s:s:1 title="English" output_video.mp4

  


  


  Everything works fine but the subtitles names are "Track 1" and "Track 2". The following part is not working :

  


  


  metadata:s:s:0 title=

  


  


• ffmpeg moving text but only within Y limits

  28 décembre 2022, par Yoav Mor

  I need to add text to a video that will scroll from bottom to top ; I managed to do it with something similar to this :

  


  ffmpeg -i vid.mp4 -vf "drawtext=fontfile=tahoma.ttf:fontsize=20:fontcolor=green:x=(w-text_w)/2+20:y=if(lt(t\,2)\,480\,(h-400-(40*t))):textfile=scroll.txt:bordercolor=white:borderw=1" -c:v libx264 -y -preset ultrafast scrolling.mp4

  


  The original video is 960x540, so the text starts at position y=480 and, after 2 seconds, starts moving up.
That bit works fine, and the text "vanishes" at the top of the frame as it scrolls up.
What I need to achieve is for the text to scroll only within certain Y limits, imagine a virtual box around the text, so it scrolls up only from a certain Y position in the bottom (but not the very bottom) and disappears into a line on the top that isn't the top part of the frame.
Can that be achieved with ffmpeg ?

  


  EDIT : Maybe the trick here should be to put the text on top of a transparent video that's smaller in height, and then within the same command somehow merge this new video that has the text with the original video. Not sure how achieve that though.

  


• Make VP9 encoding faster with the best possible quality without picture freezing

  24 décembre 2017, par kostya572

  I am using this code to combine 2 files together (overlay file over original file) :

  ffmpeg -r 60 \
  
          -i originalfile.webm -i overlayfile.mov \
  
          -filter_complex " \
  
              [0:v]setpts=PTS-STARTPTS[base]; \
  
              [1:v]setpts=PTS-STARTPTS+0.5/TB, \
  
                   format=yuva420p,colorchannelmixer=aa=0.7[overlay]; \
  
               [base][overlay]overlay=x=(W-w)/2:y=0[v]" -map "[v]" -map 0:a -c:a copy -c:v libvpx-vp9 -lossless 1 -threads 4 -quality realtime -speed 8 -tile-columns 6 -frame-parallel 1 -vsync 1 -shortest resultfile.webm

  Encoding speed is not bad and quality output also, but after some time video picture could freeze for several seconds, then again it plays ok and then again could freeze.

  How could I optimize this code to make fast speed with the highest possible quality as original file without picture freezing ?

  Thank you