Often one wants to share audio online, but it seems like video as a format has many more options: mastodon, twitter, facebook, youtube, all allow to upload video, but not only audio. Here are some ffmpeg tricks, how to add interesting video to your audio file, often autogenerated visuals. All the code is supposed to be used as one line without line-breaks.
Audio Vector Scope
|
1 2 3 4 5 6 |
ffmpeg -i INPUT_AUDIO.wav -filter_complex "[0:a]avectorscope=s=480x480:zoom=1.5:rc=0:gc=200:bc=0:rf=0:gf=40:bf=0,format=yuv420p[v]; [v]pad=854:480:187:0[out]" -map "[out]" -map 0:a -b:v 700k -b:a 360k OUTPUT_VIDEO.mp4 |
The code above creates a mp4 video file with a vectorscope nicely centered inside a 854×480 (480p) video. If you need a 1:1 video, just exclude the pad part:
|
1 2 3 4 5 |
ffmpeg -i INPUT_AUDIO.wav -filter_complex "[0:a]avectorscope=s=480x480:zoom=1.5:rc=0:gc=200:bc=0:rf=0:gf=40:bf=0,format=yuv420p[v]" -map "[v]" -map 0:a -b:v 700k -b:a 360k OUTPUT_VIDEO.mp4 |
Documentation on ‘avectorscope’ filter is here: https://ffmpeg.org/ffmpeg-filters.html#avectorscope. One can play with zoom and other options to produce desired form.
Show waves
|
1 2 3 4 |
ffmpeg -i INPUT.wav -filter_complex "[0:a]showwaves=mode=line:s=hd480:colors=White[v]" -map "[v]" -map 0:a -pix_fmt yuv420p -b:a 360k -r:a 44100 OUTPUT.mp4 |
more options: http://www.ffmpeg.org/ffmpeg-filters.html#showwaves
Showspectrum
|
1 2 3 4 |
ffmpeg -i INPUT.wav -filter_complex "[0:a]showspectrum=s=854x480:mode=combined:slide=scroll:saturation=0.2:scale=log,format=yuv420p[v]" -map "[v]" -map 0:a -b:v 700k -b:a 360k OUTPUT.mp4 |
Above code will create almost completely desaturated spectrum of the audio sliding from right to left. Again, there are various options to tweak, see here: https://ffmpeg.org/ffmpeg-filters.html#showspectrum-1
Histogram
|
1 2 3 4 |
ffmpeg -i INPUT.wav -filter_complex "[0:a]ahistogram=s=hd480:slide=scroll:scale=log,format=yuv420p[v]" -map "[v]" -map 0:a -b:a 360k OUTPUT.mp4 |
Documentation: https://ffmpeg.org/ffmpeg-filters.html#ahistogram
Static spectrogram
Sometimes you want to just create a static image.
|
1 2 3 4 5 6 7 8 9 |
# create a spectrogram as a single frame ffmpeg -i INPUT.wav -lavfi showspectrumpic=s=hd480:legend=0,format=yuv420p SPECTROGRAM.png # add png to audio - you need to know the length of audio ffmpeg -loop 1 -i SPECTROGRAM.png -i INPUT.wav -s hd480 -t 00:01:00 -pix_fmt yuv420p -b:a 360k -r:a 44100 OUTPUT.mp4 |
Above one is in two steps. More info here: http://www.ffmpeg.org/ffmpeg-filters.html#showspectrumpic
Drawtext
|
1 2 3 4 5 6 |
ffmpeg -i INPUT.wav -filter_complex "[0:a]showwaves=mode=line:s=hd480:colors=Yellow@0.5|Blue@0.5:scale=sqrt[v]; [v]drawtext=text='Rudi Rudi - Still Standing':fontcolor=White@0.5: fontsize=30:font=Arvo:x=(w-text_w)/5:y=(h-text_h)/5[out]" -map "[out]" -map 0:a -pix_fmt yuv420p -b:a 360k -r:a 44100 OUTPUT.mp4 |
Add text to any of the above with a “drawtext” filter. More options here: http://www.ffmpeg.org/ffmpeg-filters.html#drawtext-1
