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• Generate individual HLS-compatible .ts segments on-demand by downloading as little bytes as possible from a remote input file

  28 juillet 2017, par Romain Cointepas

  I’m trying to generate individual HLS-compatible .ts segments on-demand by downloading/reading as little bytes as possible from a remote input file (hosted on a server supporting byte-ranges requests).

  One of the application for this would be to be able to transcode and play on Apple TV (via Airplay) a remote file that is not Airplay compatible, without having to download the entire file first.

  I am generating the playlist myself, and I have access to the ffprobe results for the remote file (that gives video duration, etc.).

  I have something working that plays via Airplay but with small video and audio glitches between each segments when I use the following command to generate each segment :

  ffmpeg -ss 60 -t 6 -i http://s3.amazonaws.com/misc-12345/avicii.vob -f mpegts -map 0:v:0 -map 0:a:0 -c:v libx264 -bsf:v h264_mp4toannexb -force_key_frames "expr:gte(t,n_forced*6)" -forced-idr 1 -pix_fmt yuv420p -colorspace bt709 -c:a aac -async 1 -preset ultrafast pipe:1

  Note : above command is for segment 11.ts, and in the m3u8 playlist I advertise each segment duration as 6 seconds.

  Here is a Youtube video showing the audio/video glitches between segments :
  https://www.youtube.com/watch?v=0vMwgbSfsu0

  The segment or hls modules of ffmpeg can’t be used because they both generate all the segments at once.

  I’ve been struggling on this for some days now and I would really appreciate some help !

• ffmpeg : 1 frame manipulation on demand

  7 juillet 2013, par Chris Russo

  Hello folks & friends of SO !

  We need to create a small application to take a random frame from a video, and apply some modifications to it, in real time.

  This has to be done in real time, and in order to do that, we wouldn't mind to create some initial delay, before the video starts streaming. So let's assume we have a total of 6 seconds of preloading time, in order to :

  1) extract a keyframe.
  
  2) create an image with it.
  
  3) manipulate the image.
  
  4) replace the original keyframe with the new one.

  The point (3) of the previous algorithm is already solved using GD as a PHP module. However we would need to find a solution for the rest of the procedure in order to accomplish this.

  Please if anyone is available to help us with this, feel free to contact me.

  Thanks in advance ;
  Chris C. Russo

• wowza ffmpeg add watermark video on demand [on hold]

  21 janvier 2014, par kalafun

  I would like to create a VOD stream in which I would embed a watermark. The watermark would be different for every user the stream would go to. I tried to use ffmpeg to insert the watermark into the video but on my mac its taking too long to do that, I don't know how long will it take on the server but to simplify the solution I would rather access like every fifth or sixth 10sec transport stream file and embed the watermark there.

  Is it even possible in wowza to get into separate transport stream files and do something with them ? And after that send them to the user ?

  Is there any other possible solution to do that ?

  Thank you in advance.