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• Nginx Rtmp Module - How to check resolution when pushing rtmp stream to server before redirecting stream to another application ?

  22 août 2022, par bui the vuong

  I have a problem when developing a livestream system with nginx-rtmp-module . I have consulted some systems, there is a function that when pushing the rtmp stream, the livestream systems can recognize the resolution of the stream -> from there it will encode to hls with the corresponding profiles. For example stream 720p produces hls file with 360p -> 720p , if stream 1080p will produce hls file with 360p -> 1080p . I have tried the ways but no success. So how can I check the resolution and redirect the rtmp stream to the appropriate application for encoding. Looking forward to everyone's advice.

  


• How to add watermark to the video part of this huge ffmpeg command that adds intro and outro with crossfade ?

  3 juillet 2017, par Jeflopo

  I wrote a command that crossfade merge an intro, an outro, with a video :

  

  ffmpeg -i intro.mp4 -i video.mp4 -i outro.mp4 -filter_complex "
  
  [0:v]trim=start=0:end=9,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[intro]; 
  
  [0:v]trim=start=9:end=10,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[firstfadeoutclip]; 
  
  [1:v]trim=start=0:end=1,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[firstfadeinclip]; 
  
  [1:v]trim=start=1:end=24,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[video]; 
  
  [1:v]trim=start=24:end=25,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[secondfadeoutclip]; 
  
  [2:v]trim=start=0:end=1,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[secondfadeinclip]; 
  
  [2:v]trim=start=1:end=10,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[outro]; 
  
  [firstfadeoutclip]format=pix_fmts=yuva420p, fade=t=out:st=0:d=1:alpha=1[firstfadeoutalpha]; 
  
  [firstfadeinclip]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[firstfadeinalpha]; 
  
  [secondfadeoutclip]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[secondfadeoutalpha]; 
  
  [secondfadeinclip]format=pix_fmts=yuva420p, fade=t=in:st=0:d=1:alpha=1[secondfadeinalpha]; 
  
  [firstfadeoutalpha]fifo[firstfadeoutfifo]; 
  
  [firstfadeinalpha]fifo[firstfadeinfifo]; 
  
  [secondfadeoutalpha]fifo[secondfadeoutfifo]; 
  
  [secondfadeinalpha]fifo[secondfadeoinfifo]; 
  
  [firstfadeoutfifo][firstfadeinfifo]overlay[firstcrossfade]; 
  
  [secondfadeoutfifo][secondfadeoinfifo]overlay[secondcrossfade]; 
  
  [intro][firstcrossfade][video][secondcrossfade][outro]concat=n=5[output]; 
  
  [0:a][1:a] acrossfade=d=1 [audio]" 
  
  -vcodec libx264 -map "[output]" -map "[audio]" "output.mp4"

  This huge command works fine.

  But now what I want to do is to add a watermark to the video part :

  [1:v]trim=start=1:end=24,setpts=PTS-STARTPTS,scale=480x360,setsar=sar=16/9[video];

  And I want to do it by merging this command (watermark) into that one above :

  ffmpeg -i "1080p.mp4" -filter_complex "
  
  movie=logo-wm.png[watermark];
  
  [watermark][0:V]scale2ref=(1917*iw/1920)/3.5:(322*iw/1920)/3.5[wm][v]; 
  
  [v][logo]overlay=main_w-overlay_w-20:20" "output.mp4"

  The whole (1917*iw/1920)/3.5:(322*iw/1920)/3.5 scales the watermark proportionally using the scale2ref= filter. The 1917 is the width of my watermark image, and 322 is the height

  It is overlayed in the top right corner with main_w-overlay_w-20:20

  But I can’t make it work I tried to add it by copying the parameters to the filter of [1:v] input. And by adding another input for the watermark that if I’m right it would be [3:v] instead of using the movie= filter. But I can’t.

  I know that I could do it in two steps, but I would like to do it at once, in just one command.

  May anyone help me to merge them ? Thank you in advance !

• How do you change a video's resolution depending on the original one in FFMPEG ?

  16 avril 2022, par WilliamLee

  To break it down, I want to set a maximum resolution depending on the original videos resolution in ffmpeg, for an example, if i'm converting a video from 144p - 1080p, and the original video's resolution is 480p, ONLY convert the video from 144p - 480p, not 1080p.