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• How to embed pic_timing SEI wall clock timecodes in RTMP streaming ?

  16 mai 2019, par MorenoGentili

  I need to stream my desktop to the AWS MediaLive service and, as a requirement, I must include wallclock timecodes in the stream. The AWS support kindly informed me that for h.264 encoded streams, I need to provide timecodes as "pic_timing SEI messages".

  I’m streaming with Ffmpeg via the RTMP protocol on Windows 10 so, I tried adding the use_wallclock_as_timestamps and copyts flags to my command.

  ffmpeg -f gdigrab -framerate 30 -offset_x 0 -offset_y 0 -video_size 1920x1080 -show_region 1 -use_wallclock_as_timestamps 1 -i desktop -vf scale=320:240 -c:v libx264 -c:a aac -profile:v main -level 3.1 -pix_fmt yuv420p -copyts -f flv rtmp://<ip>:1935/<app>/<stream>
  
  </stream></app></ip>

  However, the timecodes are not picked up by AWS MediaLive.

  My questions are :

  • Does the use_wallclock_as_timestamps flag actually create timecodes as "pic_timing SEI messages" as required ?
  • If not, how do I add wallclock timecodes as "pic_timing SEI messages" ? It doesn’t have to be every frame. Every 2 or 3 seconds would suffice.

  I’m stumped. I couldn’t find the answer in the Ffmpeg documentation.

  Thanks for your help.

• How to embed pic_timing SEI wallclock timecodes in RTMP streaming ?

  13 novembre 2023, par MorenoGentili

  I need to stream my desktop to the AWS MediaLive service and, as a requirement, I must include wallclock timecodes in the stream. The AWS support kindly informed me that for h.264 encoded streams, I need to provide timecodes as "pic_timing SEI messages".

  



  I'm streaming with FFmpeg via the RTMP protocol on Windows 10 so, I tried adding the use_wallclock_as_timestamps and copyts flags to my command.

  



  ffmpeg -f gdigrab -framerate 30 -offset_x 0 -offset_y 0 -video_size 1920x1080 -show_region 1 -use_wallclock_as_timestamps 1 -i desktop -vf scale=320:240 -c:v libx264 -c:a aac -profile:v main -level 3.1 -pix_fmt yuv420p -copyts -f flv rtmp://<ip>:1935/<app>/<stream>&#xA;</stream></app></ip>

  



  However, the timecodes are not picked up by AWS MediaLive.

  



  My questions are :

  



  

  • Does the use_wallclock_as_timestamps flag actually create timecodes as "pic_timing SEI messages" as required ?

  


  • If not, how do I add wallclock timecodes as "pic_timing SEI messages" ? It doesn't have to be every frame. Every 2 or 3 seconds would suffice.

  


  



  I'm stumped. I couldn't find the answer in the FFmpeg documentation.

  



  Thanks for your help.

  


• Automator & ffmpeg : Create video from .png image sequence in folder

  1er septembre 2016, par imgoingtoshabooms

  ffmpeg -framerate 29.97 -i image-%03d.png -vcodec prores -profile:v 3 output.mov

  Trying to run a shell script or applescript in Automator to create a service based on the above but dont really know where to begin. This is what i’d want :

  1) select the parent folder, within are 1-2k .png files. i want to use glob i think, so i dont have to specify filename prefix (i.e. image- above)
  2) ffmpeg stitches all these clips into a prores hq qt file
  3) outputs this file to the same folder

  This is what i have so far but i know its probably way offbase—workflow fails to run :

  on run {input, parameters}
   tell application "Terminal"
       activate
       set filesString to ""
       repeat with file_ in input
           set filesString to filesString & " " & quoted form of (POSIX path of file_)
       end repeat
       do script "for f in" & filesString & "; do
/Users/brianglover/Documents/ffmpeg/ffmpeg -i -pattern_type glob -i "$f.png"  -vcodec prores -profile:v 3 \"${f%.*}.mov\"
done"
   end tell
   return input
end run

  I’m missing a lot clearly...help ?