[FFmpeg-user] filter_complex - manage missing input

[Mark Filipak]

Thanks Wayne & John. I guess I only have to find out why I'm not getting 
them even though I set up the list server to echo my own posts. Then I 
have to figure out why no one responds to my questions. Ah, well...


On 12/15/2019 11:50 AM, Enrico Vittorini wrote:
> Hello Gents,
> i would need an help. I am generating a mosaic with the following code:
> 
> ffmpeg -re -y -i input.ts -map_chapters -1 -an -sn -dn
> -filter_complex "color=c=black:size=1920x1080 [base];
> 
> [0:#0xb0] setpts=PTS-STARTPTS, scale=320x240, drawtext=fontsize=30:x=(w-text_w)/2:y=(h-text_h)/2:y=200:fontcolor=white:alpha=0.8:box=1:boxcolor=black at 0.5:boxborderw=5:text="Channel1" [r1p1];
> [0:#0x100]showvolume=r=5:b=1:h=15:w=80:o=v:v=0[r1p1a1];
> [0:#0x1101]showvolume=r=5:b=1:h=15:w=80:o=v:v=0[r1p1a2];
> 
> [base][r1p1] overlay=shortest=0 [tmp1];
> [tmp1][r1p1a1] overlay=shortest=0:x=0 [tmp2];
> [tmp2][r1p1a2] overlay=shortest=0:x=0:y=80
> "
> -c:v libx264 -b:v 4M -minrate 4M -maxrate 4M out.ts
> 
> The problem i need to face is that if the video with PID 0xb0 does not exist, the ffmpeg command fails at startup. I would need a way to go on... and eventually to replace that video with an image.
> 
> Can you help me?
> thanks
> 
> 
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