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• Extend Frame Size and Re-Encoding Video to be Blu-Ray Compliant with ffmpeg and tsMuxer

  23 novembre 2024, par grendell

  I have a media file with the following video stream :

  


  Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt709), 1440x1080 [SAR 1:1 DAR 4:3], 23.98 fps, 23.98 tbr, 1k tbn (default)


  


  I am attempting to extend the frame size to 1920x1080 and re-encode the video with libx264 to create a Blu-ray compatible video stream. I am using the following command (video filter from here) :

  


  ffmpeg -i original.mkv -c:v libx264 -preset veryslow -tune animation -profile:v high -crf 16 -pix_fmt yuv420p -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1" -an h264.mkv


  


  The resulting video stream :

  


  Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)


  


  I then copy video, audio, and subtitle streams from three separate files to create the final file :

  


  ffmpeg -i h264.mkv -i audio.mkv -i subs.mkv -map 0:v -map 1:a -map 2:s -c copy bluray.mkv


  


  I then create a Blu-ray ISO by adding each track from bluray.mkv in tsMuxer. I have enabled "Continually insert SPS/PPS" and tried both "Do not change SEI and VUI data" as well as "Always rebuild SEI and VUI data". This process succeeds without warning or error.

  


  The resulting ISO can be mounted and played in both VLC and IINA, but when it is burned to a BD25 disc and played on a PS4, the video is a mix of the original frame, what looks like multiple smaller copies of the frame with incorrect image stride, and random green blocks, all of which update around once every five seconds. All audio and subtitle tracks play without issue.

  


  How do I ensure the resulting video stream of this conversion can be played on Blu-ray players without issue ?

  


• Why this simple video streaming scheme does not work ?

  8 août 2014, par Vi.

  I’ve tried setting up simple webm video streaming scheme, based on ffserver and <video></video> element :

  # relevant part of ffserver.conf
  
  <stream>
  
      Feed feed1.ffm
  
  
  
      Format webm
  
      VideoFrameRate 15
  
      AVOptionVideo flags +global_header
  
      VideoSize 640x480
  
      VideoCodec libvpx
  
      VideoBitRate 800
  
  NoAudio
  
  </stream>
  
  
  
  # ffmpeg command line
  
  ffmpeg -f rawvideo -s 640x480 -i /dev/zero -vb 100000  http://vsodo.vi-server.org:8090/feed1.ffm
  
  
  
  # video element
  
  <video controls="controls" autoplay="autoplay">
  
      <source src="http://vsodo.vi-server.org:8090/feed1.webm" type="video/webm"></source>
  
      Your browser does not support the video tag.
  
  </video> 

  But it works only in few cases :

  • luakit - works (uses GStreamer) ;
  • uzbl - works ;
  • Firefox - fails (at least in versions 17, 24 and 26 and 31) ;
  • Chromium 31.0.1650.63 - fails ;
  • Google Chrome 27.0.1453.93 - fails ;
  • Built-in browser in Android 2.3 - fails.

  Failing browsers usually show the video length and the fact that there’s no audio track, but the video area stays black, not green as expected.

  This page lists "Partial support" or "Supported" for webm and video element. Usual players like VLC or mplayer work if specify http://vsodo.vi-server.org:8090/feed1.webm to them. Example video page also works (except of on Android 2.3).

  Why it can fail ? How do I troubleshoot browser-specific the <video></video> problems ?

• create a movie in python [closed]

  23 mai 2017, par masoud

  I have some files with names (’Den_car_resample’ +’_ sdf_ ’+ str(n)+’.dat’) where n changes from 0 to 25. I wrote a code to read these files and plots the results.
  now I want to create a movie from these plots. at the end of the program, I used the avconv command to do that.
  but, unfortunately my code creates a movie but it is empty.
  I don’t know the reason exactly but I think, first, I have to define a frame to each plot and then create a movie.
  can anyone please tell me how can I define a frame and also the add bit_rate of the movie.

  import sys
  
  import subprocess   
  
  import sdf
  
  import numpy as np
  
  import matplotlib.pyplot as plt  
  
  import time
  
  import matplotlib.animation as Animation
  
  from matplotlib.font_manager import FontProperties
  
  fp = FontProperties('Symbola')
  
  
  
  ##################### information from EPOCH input.deck
  
  nx,ny= 1200, 1600
  
  xmin=-100e-6
  
  xmax = 110e-6
  
  ymin = -200e-6
  
  ymax = 200e-6
  
  X =np.linspace(xmin,xmax,nx)   
  
  Y =np.linspace(ymin,ymax,ny)
  
  
  
  #################
  
  for n in range(0,25):
  
    nstr = str(n)
  
  
  
  ######################..... reading Density of carbon
  
    filename ="Den_car_resample" +'_sdf_'+ str(n)+'.dat'
  
  
  
    with open(filename, 'rb') as f:                        
  
      data = np.fromfile(f, dtype='float64', count=nx*ny)  
  
  
  
    Den_car  = np.reshape(data, [ny, nx], order='F')
  
    Den_car= np.log10(Den_car)
  
  
  
    ######################  Display Carbon density
  
  
  
    fig = plt.imshow(Den_car,  extent=[X.min()*1e6, X.max()*1e6, Y.min()*1e6,Y.max()*1e6], vmin=24, vmax=29, cmap='brg', aspect='auto') 
  
    plt.suptitle('Den_car')
  
    plt.title('sdf '+ str(n)+'; Time= '+str(n*50)+'ps',color='green', fontsize=15)
  
    plt.xlabel('x($\mu$m)')
  
    plt.ylabel('y($\mu$m)')
  
    plt.text(-80,-40,'Den_Carbon',color='red', fontsize=15)
  
    plt.colorbar()
  
    plt.savefig( 'fig%06d.png' % n, bbox_inches='tight')          
  
  
  
    plt.pause(.1)
  
    plt.clf()  
  
    plt.close()
  
  
  
    ######################  Create movie
  
  
  
    subprocess.call("avconv -framerate 1 -i fig%06d.png -c:v libx264 -profile:v high -crf 20".split())
  
  
  
  sys.exit()