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• FFMPEG : How to mix different types of image sequence inputs when creating multiple streams

  9 août 2021, par chutlies

  I am using a piece of software that generates a .txt files with rendered images. The list within that txt files is printed with the word 'file' at the beginning of the file path.

  


  Ex : file 'file:C :/Users/User/Desktop/test/Test.0001.png'

  


  I am attempting to input another image sequence as an overlay. Everything works fine if I just overlay, scale, and render. So this works fine :

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay[4K_in];[4K_in]scale=1920:1080[hdOut]" -map [hdOut] hd.mp4


  


  But when I start to split the stream to create different outputs it will only render the overlayed stream [1:v] and not the composited image.

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i C:/test/input.txt -i "C:/test/BALL.%04d.png" -filter_complex "overlay,split=3[mp4HD_in][mxf720_in][mov4K_in];[mp4HD_in]scale=1920:1080[mp4HD_out];[mxf720_in]scale=1280:720[mxf720_out];[mov4K_in]scale=3840:2160[mov4K_out]" -crf 16 -vcodec libx264 -map [mp4HD_out] C:/test/hdMP4.mp4 -vcodec prores -map [mov4K_out] C:/test/MOV4K.mov -vcodec dnxhd -pix_fmt yuv422p -b:v 75M -map [mxf720_out] C:test/MXF720.mxf


  


  If I remove 'file' from the frames file path in the .txt file it works.

  


  Ex : file 'C :/Users/User/Desktop/test/Test.0001.png'

  


  Unfortunately, I am unable to change this as it's being generated and run within a piece of software. Are there any flags or something that I need to add to get around this ? Any other possible techniques beyond starting another &&ffmpeg call to generate the streams over the overlay ?

  


  I do get this in the logs :&#xA;[concat @ 0000024a0eacf280] DTS -230584300921369 < 0 out of order&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;DTS -230584300921369, next:40000 st:0 invalid dropping&#xA;PTS -230584300921369, next:40000 invalid dropping st:0&#xA;[image2 @ 0000024a0eadd140] Thread message queue blocking ; consider raising the thread_queue_size option (current value : 8)

  &#xA;

• 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 slows down as I run it

  14 septembre 2022, par Bambi2k21

  I edit a video such that it speeds up by 8x where the speaker is silent and by 2x when he is speaking. And to do that I use ffmpeg in such a manner :

  &#xA;

  ffmpeg -i C:\Users\TheD4\Desktop\uni1.mp4 -filter_complex "[0:v]trim=0:0.98,setpts=1*(PTS- 
STARTPTS)[v0]; [0:a]atrim=0:0.98,asetpts=PTS-STARTPTS,atempo=1[a0] 
[0:v]trim=0.98:1.598,setpts=0.5*(PTS-STARTPTS)[v1]; [0:a]atrim=0.98:1.598,asetpts=PTS- STARTPTS,atempo=2[a1]; [0:v]trim=1.598:1.946,setpts=1*(PTS-STARTPTS)[v2]; 
[0:a]atrim=1.598:1.946,asetpts=PTS-STARTPTS,atempo=1[a2]; [0:v]trim=1.946:1.975,setpts=0.5*(PTS- 
STARTPTS)[v3]; [0:a]atrim=1.946:1.975,asetpts=PTS-STARTPTS,atempo=2[a3];............ 
[0:v]trim=1529.04:1537.34,setpts=1*(PTS-STARTPTS)[v1652]; [0:a]atrim=1529.04:1537.34,asetpts=PTS- 
STARTPTS,atempo=1[a1652]; [0:v]trim=1537.34:1537.55,setpts=0.5*(PTS-STARTPTS)[v1653]; 
[0:a]atrim=1537.34:1537.55,asetpts=PTS-STARTPTS,atempo=2[a1653]; 
[0:v]trim=1537.55:1538.73,setpts=1*(PTS-STARTPTS)[v1654]; [0:a]atrim=1537.55:1538.73,asetpts=PTS- 
STARTPTS,atempo=1[a1654]; [0:v]trim=1538.73:1539.15,setpts=0.5*(PTS-STARTPTS)[v1655]; 
[0:a]atrim=1538.73:1539.15,asetpts=PTS-STARTPTS,atempo=2[a1655]; [v0][a0][v1][a1][v2][a2][v3] 
[a3]..........[v1652][a1652][v1653][a1653][v1654][a1654][v1655][a1655]concat=n=1656:v=1:a=1" -preset 
superfast -profile:v baseline


  &#xA;

  But the thing is, as you might have noticed the filter goes into the thousands, and so the total number of caracters is high(in this example there are around 200000), but cmd(8000) or powershell(30000) have less than that. So to get around that limitation, I divided all of that into smaller parts, but here is where the problem starts, as I run more and more of the "parts code" and ffmpeg does work on later and later parts of the video, the process of making the video from those smaller parts becomes slower as well, even though the size of the video is the same. To see what is wrong, I ran the code from a couple of hundred seconds(so instead of starting from 0s it start from let's say 500s) and I noticed the same effect. So what I think happens is that ffmpeg goes through the entirety of the video until it reaches the specified start. So here is my question is there a way to tell ffmpeg to ignore the start of the video and to start immediately from where I need it to, maybe something like this :

  &#xA;

  ffmpeg -i C:\Users\TheD4\Desktop\uni1.mp4[500:] -filter_complex ........


  &#xA;