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• ffmpeg - Stream multiple files over an ffserver to one ffplay at different times ? [closed]

  13 mai 2013, par golmschenk

  I have an ffserver up and running. Using this server I can run a simple ffplay command :

  ffplay udp://localhost:7777

  which then waits for a stream. Then if I stream something to the server with a simple ffmpeg command :

  ffmpeg -re -i small.mp4 -f mpegts udp://localhost:7777

  The video pops up and plays fine. However, after the video is finished and the ffplay is still waiting open with the display window showing the last frame of the video just sent, then if I try to run the same ffmpeg command again to play the video again, the ffplay gets a bunch of warnings which look similar to :

  [mpegts @ 0x7fde1c0008c0] Continuity check failed for pid 256 expected 2 got 0

  And there is no playback. I would like to be able to stream one video, leave the same ffplay open and a little while after the first video has stopped stream another video. Is there a way I can achieve this ? Thank you much !

• Is ffmpeg using a buffer ? Why arent the filename and drawtext times matching ?

  6 octobre 2018, par Ian Rubenstein

  I am using ffmpeg to

  1) capture images from a webcam as jpeg with the timestamp in the filename and as an overlay with drawtext

  ffmpeg -s 1920x1080 -framerate 20 -i /dev/video1 -f image2 -ss 8 -s 1920x1080 -qscale:v 1 -r 1 -strftime 1 -vf setpts=.2*PTS, drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf: text='%{localtime\:%Y-%m-%d_%T}': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)*.04: y=(h-text_h)*.96 /home/ian/netdrives/antares/Pictures/plant_lapse/ir/20181004/plant.%Y%m%d_%H%M%S.jpeg

  2) combine the images into a timelapse video

  C:/Users/Ian/apps/ffmpeg/bin/ffmpeg -f concat -safe 0 -i processingfilelist.ir_20181004.txt -c:v h264_nvenc -rc constqp -qp 38 -s 1920x1080 -filter:v format=yuv420p,fps=60,scale=iw/1.5:-1,yadif=0:-1:0,hqdn3d plant_lapse_ir_20181004_074451_dusk.mp4

  Its generally working, but I noticed the filenames are one frame ahead of the timestamp shown in the overlay.

  Example Image - Im not smart enough to know which is the right time, just to know that I’d like them to match. Any ideas why they don’t ?

• ffmpeg images to video with different start times and durations

  25 mai 2018, par Rich

  I’ve recently learned of FFMPEG’s existence and I am trying to use it on my wordpress site.

  On the site I am working on a html/php/js form page that lets users upload pictures, and set when the image shows and for how long.

  Right now the code I have is only showing one image for the entire video.

  <?php if (isset($_POST['button'])) { 
  
  echo shell_exec('ffmpeg -t '.$cap_1.' -i /myurl/beach-1866431.jpg -t '.$cap_2.' -i /myurl/orlando-1104481-1.jpg -filter_complex "scale=1280:-2" -i /myurl/audio.mp3 -c:v libx264 -pix_fmt yuv420p -t 30 -y /myurl/'.$v_title.'.mp4 2>&1');
  
   } ?>

  I tried setting "-t" for the duration with my php variables but nothing changes and I cant figure out what to use for the start time of each image.

  Also, when writing shell_exec commands, instead of it all being on one line, is there a way to write working command code in php files with line breaks ? For example -

   <?php if (isset($_POST['button'])) { 
  
      echo shell_exec('ffmpeg -t '.$cap_1.' -i /myurl/beach-1866431.jpg 
  
      -t '.$cap_2.' -i /myurl/orlando-1104481-1.jpg 
  
      -filter_complex "scale=1280:-2" 
  
      -i /myurl/audio.mp3 
  
      -c:v libx264 -pix_fmt yuv420p -t 30 -y /myurl/'.$v_title.'.mp4 2>&1');
  
           } ?>

  EDIT

  So far the concat text file seems to work, however I do not know how to set the start times for each image ---

  ffconcat version 1.0
  
  file /path/beach-1866431.jpg
  
  duration 3
  
  file /path/orlando-1104481-1.jpg
  
  duration 5
  
  file /path/beach-1866431.jpg

  And ffmpeg command -

  shell_exec('ffmpeg -f concat -safe 0 -i /path/file.txt -filter_complex "scale=1280:-2" -i /path/audio.mp3 -c:v libx264 -pix_fmt yuv420p -t 30 -y /path/'.$v_title.'.mp4 2>&1');

  EDIT 2

  Using the concat method suggested, my code now looks like this —

  <?php if (isset($_POST['button'])) { 
  
  echo shell_exec('ffmpeg \
  
  -loop 1 -framerate 24 -t 10 -i goldmetal.jpg \
  
  -i 3251.mp3 \
  
  -loop 1 -framerate 24 -t 10 -i cash-register-1885558.jpg \
  
  -loop 1 -framerate 24 -t 10 -i ice-1915849.jpg \
  
  -filter_complex "[0:v][1:a][2:v][3:v]concat=n=4:v=1:a=1[v][a]" -map "[v]" -map "[a]" -c:v libx264 /path/'.$v_title.'.mp4 2>&1');
  
   } ?>

  But I’m getting this error —

  **Stream specifier ':v' in filtergraph description [0:v][1:a][2:v][3:v]concat=n=4:v=1:a=1[v][a] matches no streams.**

  EDIT 3

  I almost got it working as needed, using 2 commands, one for the images and fade, the other to combine the audio. The only issue I’m having is changing the time each image shows up. —

  echo shell_exec('ffmpeg \
  
  -loop 1 -t 5 -i '.$thepath .'/'.$v_pix1.' \
  
  -loop 1 -t 5 -i ' .$thepath . '/cash-register-1885558.jpg \
  
  -loop 1 -t 5 -i ' .$thepath . '/ice-1915849.jpg \
  
  -loop 1 -t 5 -i '.$thepath .'/'.$v_pix1.' \
  
  -loop 1 -t 5 -i ' .$thepath . '/ice-1915849.jpg \
  
  -filter_complex \
  
  "[0:v]setpts=PTS-STARTPTS,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v0]; \
  
   [1:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v1]; \
  
   [2:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v2]; \
  
   [3:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v3]; \
  
   [4:v]setpts=PTS-STARTPTS,fade=t=in:st=0:d=1,fade=t=out:st=4:d=1,scale=1280:720,setdar=16/9,setsar=sar=300/300[v4]; \
  
   [v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuv420p[v]" -map "[v]" -y '.$thepath .'/fadeout.mp4 2>&1');
  
  
  
  
  
  echo shell_exec('ffmpeg \
  
  -i '.$thepath .'/fadeout.mp4 \
  
  -i '.$thepath .'/3251.mp3 \
  
  -filter_complex "[0:v:0][1:a:0] concat=n=1:v=1:a=1 [vout] [aout]" -map "[vout]" -map "[aout]" -c:v libx264 -r 1 -y '.$thepath .'/mergetest.mp4 2>&1');