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• Ffmpeg : convert a video to an anamorphose video

  16 janvier 2017, par Aminesrine

  What does mean convert a video to an anamorphose video ?

  I want to canvert a file .avi to an anamorphose video, how can I do that with ffmpeg ?

• Python, Flask, ffmpeg video streaming : Video does not work in Firefox

  12 avril 2018, par user3187926

  I am writing a preview portion for video management system, it works like a charm in chrome with standard tag but firefox does not recognize MIME type for some reason and it bugs me a lot.

  Here is my stream class :

  class Stream:
  
      run = False
  
      FNULL = open(os.devnull, 'w')
  
      overlay = ffmpeg.input("somelogo.png")
  
  
  
      def __init__(self, camid):
  
          camUtil = CameraUtil()
  
          self.camid = camid
  
          self.streamurl = camUtil.get_stream_from_id(self.camid)['streamURL']
  
          print(self.streamurl)
  
          self.args = ffmpeg.input(self.streamurl)
  
          # vcodec="libvpx",
  
          # acodec="libvorbis",
  
          self.args = ffmpeg.output(self.args, "-",
  
                                    f="matroska",
  
                                    vcodec="copy",
  
                                    acodec="copy",
  
                                    blocksize="1024",
  
                                    # strftime="1",
  
                                    # segment_time="60",
  
                                    # segment_format="matroska"
  
                                    preset="ultrafast",
  
                                    metadata="title='test'"
  
                                    )
  
          self.args = ffmpeg.get_args(self.args)
  
          print(self.args)
  
          self.pipe = subprocess.Popen(['ffmpeg'] + self.args,
  
                                       stdout=subprocess.PIPE,)
  
                                       #stderr=self.FNULL)
  
  
  
      def dep_stream(self):
  
          def gen():
  
              try:
  
                  f = self.pipe.stdout
  
                  byte = f.read(1024)
  
                  while byte:
  
                      yield byte
  
                      byte = f.read(1024)
  
              finally:
  
                  self.pipe.kill()
  
  
  
          return Response(gen(), status=200,
  
                          mimetype='video/webm',
  
                          headers={'Access-Control-Allow-Origin': '*',
  
                                   "Content-Type": "video/webm",
  
                                   })

  My html playback portion :

     <video preload="auto" autoplay="autoplay" width="1280" height="720">
     <source src="/stream/{{ camid }}" type="video/webm;codecs=&quot;vp8, vorbis&quot;"></source>
     YOUR BROWSER DOES NOT SUPPORT HTML5, WHAT YEAR ARE YOU FROM?!
   </video>

  Firefox says "No video with supported format and MIME type found" and in console it says

  error : Error Code : NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)

  Did I do something dumb ?! Or am I missing something, because it works google chrome like a charm

  I need fresh eyes.

  Help plez

• Ffmpeg encoding a video with time_base Not equal to framerate does not work hardware accelerated Video Player

  10 janvier 2020, par Gilgamesh22

  I have a time_base of 90000 with a frame rate of 30. I can generate a h264 video and have it work in VLC but this video does not work in a hardware accelerated web chrome player using Intel HD Graphics 530. If I change the time_base to 30 It works fine.

  Note : I am changing the frame->pts appropriately to match the time_base.
  Note : Video does not have audio stream

  //header.h
  
  AVCodecContext *cctx;
  
  AVStream* stream;

  Here is the non working example code

  //source.cpp
  
  stream->time_base = { 1, 90000 };
  
  stream->r_frame_rate = { fps, 1 };
  
  stream->avg_frame_rate = { fps, 1 };
  
  
  
  cctx->codec_id = codecId;
  
  cctx->time_base = { 1 ,  90000 };
  
  cctx->framerate = { fps, 1 };
  
  
  
  // ...... 
  
  // add frame code later on timestamp are in millisecond
  
  frame->pts = (timestamp - startTimeStamp)* 90;

  Here is the working example code

  //source.cpp
  
  stream->time_base = { 1, fps};
  
  stream->r_frame_rate = { fps, 1 };
  
  stream->avg_frame_rate = { fps, 1 };
  
  
  
  cctx->codec_id = codecId;
  
  cctx->time_base = { 1 ,  fps};
  
  cctx->framerate = { fps, 1 };
  
  
  
  // ...... 
  
  //  add frame code timestamp are in millisecond
  
  frame->pts = (timestamp - startTimeStamp)/(1000/fps);

  Any ideas on why the second example works and the first does not in the video player.