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• Codec issue ? Mp4 video flashing during play via JW Player (and same issue with mac computer)

  19 décembre 2017, par janosdupai

  I have a linux based server online. It has Mp4 videos. I try to play these video with JW Player. I had any problems with them, but some files has the following problem : https://www.video.match-meeting.com/drive/5a350a6700bc4.mp4

  If I download this file to a windows computer, it plays without problem. Is that a codec problem with my server (and on my mac) ?

• Can I make a seek accurate video player with ffmpeg ?

  5 septembre 2016, par Will Tower

  Simple question : I would like to make a video player with "fairly" accurate seeking and need to know if I can do that with ffmpeg. I think the answer is "Well, yeah of course you can" but want to get a reality check before I waste lots of time only to discover that I can’t.

  I am coding in Actionscript for a cross platform desktop AIR app. I am using a NativeProcess to run ffmpeg in the background and using Actionscript’s NetConnection and NetStream classes to connect the ffmpeg stream to a Video class. Using ffmpeg with a NativeProcess is essentially running ffmpeg from the command line. I have basic AS3 code roughed out to load and play a video through ffmeg and I am going through the dranger tutorial (How to Write a Video Player in
  Less Than 1000 Lines ) now to sort out the rest of it.

  Would appreciate hearing of any caveats or cautions.

  Update : So I have been fiddling with this all afternoon but no success yet. I am able to run a video with the following commands (NativeProcess code removed for clarity) :

  ffmpegArgs = new Vector.<string>();
  
  ffmpegArgs.push("-re", "-i",videoPath,"-c:a", "copy", "-c:v", "copy","-f", "flv", "-");
  
  </string>

  But I am confused about how to interact with ffmpeg once it is running. I’ve tried a bunch of variations on this scenario : using writeUTFBytes to send commands to the ffmpeg NativeProcess instance without a good result :

  var cmd:String = "-ss, 50, -re, -i," + videoPath + ",-c:a, copy, -c:v, copy, -f flv -";
  
  ffmpegProcess.standardInput.writeUTFBytes(cmd); 

  Do I need to tear down and respawn the ffmpeg NativeProcess instance in order to access different sections of a video file ?

  ---

  ss position (input/output)

  When used as an input option (before -i), seeks in this input file to position. Note that in most formats it is not possible to seek
  exactly, so ffmpeg will seek to the closest seek point before
  position. When transcoding and -accurate_seek is enabled (the
  default), this extra segment between the seek point and position will
  be decoded and discarded. When doing stream copy or when
  -noaccurate_seek is used, it will be preserved.

  When used as an output option (before an output filename), decodes but discards input until the timestamps reach position.

  https://ffmpeg.org/ffmpeg.html#Video-Options

• simple light weight video player using ffmpeg that can play simple http network streams in C/C++ [on hold]

  25 janvier 2015, par Shijin Bose

  Can anyone please help me make a simple light weight video player using ffmpeg that can play simple http network streams. I couldn’t find any simple codes. It doesn’t want any additional features, but just a playback function. I need the code in c or c++. QtAV is complex and is not getting compiled, and it is bulky. Please suggest any sites.

                                           Thanks,