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• fallback input when blackscreen ffmpeg

  23 novembre 2022, par renadr

  I would like to have a "fallback" video when using the ffmpeg command. The goal is that I broadcast a video and once this one displays an almost black screen, there should be a switch to the fallback, and re-switch when the black screen is over. I know that we can detect the "blackframe" but I'm lost then.. If anyone have an idea ?

  


  I'm at this point for the moment (I'm using streamlink for getting the input) :

  


  streamlink <> best -O | ffmpeg -re -i pipe:0 -c:v libx264 -vf "blackframe=amount=40:thresh=5" -c:a aac -strict -2 -f flv <> | grep blackframe


  


  thank you

  


• FFmpeg - Xstack mutiple inputs for mosaic video output - extra output Blank screen is always green

  16 août 2020, par Dennisski

  I have a website where we combine multple videos with ffmpeg xstack. Its an automated process. When there is not an even number of videos the blank tiles in the mosaic are green. I am trying to figure out how to make the spare blanks Black.

  


  I have tried xstack=inputs=2:fill='black':layout=0_0 (this gives an error object not found) also tried -filter_complex "color=s=1920x1080:c=black".

  


  Any suggestions ? Here is entire command :

  


  ffmpeg -i video1 -i video1 -i video1 -i video1 -i video1 -i video1 -i video1 \ 
    -i video1 -i video1 -filter_complex \
    "color=s=1920x1080:c=black;[0:v] setpts=PTS-STARTPTS, scale=qvga [a0];[1:v] setpts=PTS-STARTPTS, scale=qvga [a1];[2:v] setpts=PTS-STARTPTS, scale=qvga [a2];[3:v] setpts=PTS-STARTPTS, scale=qvga [a3];[4:v] setpts=PTS-STARTPTS, scale=qvga [a4];[5:v] setpts=PTS-STARTPTS, scale=qvga [a5];[6:v] setpts=PTS-STARTPTS, scale=qvga [a6];[7:v] setpts=PTS-STARTPTS, scale=qvga [a7];[8:v] setpts=PTS-STARTPTS, scale=qvga [a8];[a0][a1][a2][a3][a4][a5][a6][a7][a8]xstack=inputs=9:layout=0_0|w0_0|w0+w1_0|0_h0|w0_h0|w0+w1_h0|0_h0+h1|w0_h0+h1|w0+w1_h0+h1[out] " \
    -map "[out]" output


  


• Why isn't the 'wrap' option recognized in FFmpeg's drawtext filter ?

  24 février 2023, par eugene_prg

  I'm trying to add text to a video using FFmpeg's drawtext filter, but I'm running into an issue with the 'wrap' option. Whenever I include 'wrap=500' in the filtergraph, I get the following error message :

  


  [Parsed_drawtext_1 @ 0x563e23b1f500] Option 'wrap' not found
[AVFilterGraph @ 0x563e23b18d00] Error initializing filter 'drawtext' with args 'enable=between(t,0,4):text=one day you wake up and...:x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500'
Error reinitializing filters !
Failed to inject frame into filter network : Option not found
Error while processing the decoded data for stream #0:0

  


  Here's the full command I'm using :

  


  ffmpeg -y -i "./videos/pexels-ivan-samkov-6689156.mp4" -vf "drawtext=fontfile=./fonts/DejaVuSans.ttf:text='DID U KNOW':x=(w-text_w)/2:y=200:fontsize=72:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=10, drawtext='enable=between(t,0,4)':text='do you know that girls...':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500, drawtext='enable=between(t,4,8)':text='are smarter than guys?':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5" -c:a copy "pexels-ivan-samkov-6689156.mp4_with_labels.mp4"


  


  I'm not sure why the 'wrap' option isn't recognized. Can anyone help me figure out what's going on ?