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• 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 : Need to convert source video to web/phone html5 players. Willing to pay [on hold]

  25 juillet 2015, par mariotanenbaum

  I need somebody to write me commands for converting videos and i’m willing to pay that.

  I need to convert most of these : (if ffmpeg doesn’t support any of those, just ignore it)

  mov (QuickTime Movie)
  mp4 (MPEG-4 Video)
  mpe (MPEG Video)
  mpeg (MPEG Video)
  mpeg4 (MPEG-4 Video)
  3g2 (Mobile Video)
  3gp (Mobile Video)
  3gpp (Mobile Video)
  asf (Windows Media Video)
  avi (AVI Video)

  To most of these :

  HTML5, Flash : MP4/H.264, High profile
  HTML5 : WebM
  HTML5 : Ogg
  Mobile : MP4/H.264, Baseline profile, 480x360, for wide compatibility
  Mobile : MP4/H.264, Main profile, 1280x720, for newer iOS devices (iPhone 4, iPad, Apple TV)
  Mobile : 3GP/MPEG4, 320x240 and/or 177x144, for non-smartphones*

  Nothing which would not work out of box in ffmpeg
  Some tweaking about processor usage and quality is ok but not so important.

  Goal is to get suitable clips for playing in chrome, firefox, ie9, iphone and android.
  For now iphone is the most important.

  IF you have some spare time, feel free to contact me, i would pay somebody just to send me "commands". It doesn’t to be anything "smart" just so that i don’t need to spend so much time trying learn all about ffmpeg.

• Python Docker SDK long command to container [duplicate]

  2 avril 2021, par Neil Bernard

  I need to send a fairly long command using python docker SDK

  


  ffmpeg -f lavfi -re -i smptebars=duration=60:size=1280x720:rate=30 -f lavfi -re -i sine=frequency=1000:duration=60:sample_rate=44100 -pix_fmt yuv420p -c:v libx264 -b:v 1000k -g 30 -keyint_min 120 -profile:v baseline -preset veryfast -f mpegts "srt://127.0.0.1:4200?pkt_size=1316"


  


  I have an example where you ned to wrap each element in double quotes.

  


  container1 = client.containers.run("alpine", ["echo", "hello", "world"],name='autotest', detach=True)


  


  2 Questions

  


  Is there an elegant way to do this ?
If not how do I handle the bits that already have quotes ?