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• Is it possible to get only the total number of black frames from a video clip using ffmpeg (windows user) ?

  15 novembre 2017, par raaki

  I have a .avi video clip which runs for 30 minutes with 30 fps. I want to know the total number of black frames in that clip instead of showing every black frame. Is it possible to do it using ffmpeg ?

• ffmpeg randomly hangs and takes huge cpu usage when recording audio streams

  7 décembre 2017, par Maximax40

  I am trying to record 54 radio station using ffmpeg for Windows. I get those audio from different URL and separate instances of ffmpeg record and encode them to .wav format. It works great, it does it’s job with a very low cpu and memory usage and I get the results I want. However, sometimes a random ffmpeg process seems to hang and start using 25% cpu usage on it’s own and stop recording.

  It happens several times a day, and everytime I need to restart the process. If I’m not paying attention to the processes when one is stall, others will start to hang as well. If 4 of them hangs, I get 100% cpu usage and more than half of the recordings stops working, probably because of overload or something.

  When a process stall, I don’t get any error in the cmd window, it just freezes. It really seems to be random, because 2 computers are doing the same thing and record the exact same streams, but when a process stall on a computer, the same process works fine on the other, so I don’t think it’s related to the stream input.

  Here is an example of the command I use to launch a ffmpeg process :

  ffmpeg -y -i "http://icecast-cftx.rncm.ca/cftx.mp3" -ab 3200 -ar 16000 -ac 1 -f segment -segment_time 600 -strftime 1 "audios/CBFFMTR %%Y-%%m-%%d %%H-%%M-%%S.wav"

  Can anyone help me on this issue ? It’s really sad that I can’t rely on this software because of this.

  Thank you

  EDIT : After another check, I realise that when a recording crash on one of the computers, the same one crash on the other.

• 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 !