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• ffmpeg split video H264 stutters on Windows Media Player

  9 mars 2019, par Juan Foegen

  I am converting and splitting wmv and mp4 into new mp4 files. I am using ffmpeg to do the conversion with simply :
  ffmpeg -i inputfile.wmv -vcodec libx264 -ss 00:00:10 -t 00:00:15 outputfile.mp4

  So when I create my split video it plays fine on other video players, like VLC, but stutters when initially playing on Windows Media Player and even shows a blank screen for a moment and then after about 5 seconds, the video will play normally. If I then select play again without reloading, Windows Media Player will play the video fine, with no stuttering.

  If I REMOVE the start parameter when doing the conversion, then the resulting video will play without issues on all my players, INCLUDING Windows Media Player.

  I have tried changing the frame rate, the bit rate and altered different optimization options mentioned here - https://trac.ffmpeg.org/wiki/Encode/H.264

  I need the split video to play on Windows machines on Windows Media Player and on the web streamed using the video element. This is why I chose H264 codec and MP4.

  Has anyone had issues playing ffmpeg split videos using H264 codec with Windows Media Player ? I am using the latest version of ffmpeg. Anyone have any other suggestions on any different settings I could try to adjust ?

  Thanks

• Possible to Combine Live m3u8 stream with PIP overlay from WebRTC source ?

  25 octobre 2015, par user1258530

  Can someone tell me what server-side technology (perhaps ffmpeg), one could use in order to :

  1) display this full-screen live-streaming video :

  http://aolhdshls-lh.akamaihd.net/i/gould_1@134793/master.m3u8

  2) and overlay it in the lower-right corner with a live video coming from a webRTC video-chat stream ?

  3) and send that combined stream into a new m3u8 live-stream

  4) Note that it needs to be a server-side solution - - - cannot launch multiple video players in this case (needs to pass the resulting stream to SmartTV’s which only have one video-decoder at a time)

  The closest example I’ve found so far is this article :

  https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

  Which isn’t really live, nor is it really doing overlays.

  any advice is greatly appreciated.

• How to use the —abr-ladder from x265 on ffmpeg

  14 septembre 2020, par Diego

  I'm trying to find out how to use the latest x265 abr-ladder option on ffmpeg, which promises up to 65% time savings compared to sequential generation, according to release notes, but : (1) I'm not sure if it is already available on ffmpeg or how to find out, and if it is (2) specifying the input/output inside the configuration file instead of the ffmpeg CLI causes ffmpeg to complain that required parameters are missing.

  


  In the x265 repository there is a example for configuration file, but I couldn't find there or in the ffmpeg repository instructions on how to use this kind of parameter that doesn't seem to follow the CLI standards for ffmpeg. Apparently it is possible to create multiple outputs in a single command using ffmpeg, but again I couldn't make it work.

  


  So what I'm looking for is a usage example for the --abr-ladder parameter for x265. Thank you.