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• Imprint an Image above a video's canvas [duplicate]

  25 août 2021, par ichthyocentaurs

  I want to add an image strip above/below a video using ffmpeg, but currently it overlaps the video content.

  


  The command I was using

  


  ffmpeg -i ./image_path.png -filter_complex \"[1:v][0:v]scale2ref=(3000/200)*ih/8/sar:ih/8[wm][base];[base][wm]overlay=0:0\" -pix_fmt yuv420p -c:a copy output.mp4

[wm]overlay=0:-200 Does not imprint anything

"pad=height=ih+40:color=#71cbf4,overlay=(main_w-overlay_w)/2:main_h-overlay_h" places at the bottom of the video canvas


  


  I want to place my image strip either above or below the video canvas.

  


• ffmpeg render file with transparent background

  16 novembre 2022, par Валентин Никин

  I have the next scheme of tracks. I need to render that tracks to one track with ffmpeg.

  


  

  


  After rendering it's should looks like

  


  

  


  I want to use the next scheme :

  


  

  1. Rendering Track 001 to file.

  


  2. Rendering Track 002 to file.

  


  3. Overlay Track 002 on Track 001.

  


  


  For the "Track 001" I can "concat" clips to one track without any problem.

  


  But the question is how I should concat clips for the "Track 002" ? The "Empty" places must be transparent for the overlaying on the 3 step.

  


  I already tried to use for the Empty places input with transparent color. But on the overlaying step transparent doesn't work.

  


  ffmpeg -f lavfi -i color=c=red@0.0:s=1920x1080:r=25:d=1 \
    -i Clip004.mp4 \
    -i Rendered_track_001.mp4 \
    -filter_complex "[0:v] [1:v] xfade=transition=fade:duration=2:offset=0.5[trak]; \
                    [2:v][trak]overlay[out]" \
     -map "[out]" -c:v vp9 -c:a copy test.webm


  


  I also tried to use alphaextract and alphamerge like this

  


  ffmpeg -f lavfi -i color=c=red@0.0:s=1920x1080:r=25:d=1 \
    -i Clip004.mp4 \
    -i Rendered_track_001.mp4 \
    -filter_complex "[0:v] [1:v] xfade=transition=fade:duration=2:offset=0.5[out]; \
                    [out]alphaextract[alpha];[2:v][alpha]alphamerge[out1]" \
     -map "[out1]" -c:v vp9 -c:a copy test.webm


  


  But it's fail with error

  


  [AVFilterGraph @ 0x556557d3ce00] The following filters could not choose their formats: 
Parsed_alphaextract_1
Consider inserting the (a)format filter near their input or output.
Error reinitializing filters!
Failed to inject frame into filter network: Input/output error
Error while processing the decoded data for stream #2:0


  


  Any help would be appreciated.

  


• insert audio into another audio file (eg a censor bleep)

  3 avril 2019, par Redzarf

  I need to insert a short beep into another audio file (similar to a censorship bleep) using linux and/or php.

  I’m thinking there should be some way to do it with ffmpeg (with some combination of -t, concat, map, async, adelay, itsoffset ?) or avconv or mkvmerge - but haven’t found anyone doing this. Maybe I need to do it in 2 stages somehow ?

  For example if I have a 60 second mp3 and want to beep out 2 seconds at 2 places the desired result would be :

  0:00-0:15  from original
  
  0:15-0:17  beep (overwrites the 2 secs of original)
  
  0:17-0:40  from original
  
  0:40-0:42  beep
  
  0:42-0:60  from original

  I have a 2 second beep.mp3, but can use something else instead like -i "sine=frequency=1000:duration=2"