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• ffmpeg command gives error when used in python

  3 juillet 2018, par Yaser Sakkaf

  When I run this command from the shell it works perfectly.

  ffmpeg -nostdin -i /data/binil/v2t_final/output/cnbctv18/2018_07_02_14_38_30/tmp/merged.avi -ss 00:00:00 -vcodec h264 -vf fps=25 -to 00:6:43 /data/binil/v2t_final/output/cnbctv18/2018_07_02_14_38_30/1/1.avi

  But the same thing when I do in python it gives error :

  import sys
  
  import os
  
  
  
  INPUT_DIR = sys.argv[1]
  
  INPUT_VIDEO = sys.argv[2]
  
  OUTPUT_PATH = sys.argv[3]
  
  SOURCE = sys.argv[4]
  
  DATE = sys.argv[5]
  
  
  
  INPUT = INPUT_DIR+"sorted_result.txt"
  
  COUNT=1
  
  initial="00:00:00"
  
  
  
  with open(INPUT,"r") as f:
  
    for line in f.readlines():
  
      OUT_DIR = OUTPUT_PATH+str(COUNT)
  
      directory = os.path.abspath(OUT_DIR)
  
      print('OUT DIR',OUT_DIR)
  
      print('directory',directory)
  
      try:
  
        os.mkdir(directory)
  
      except:
  
        pass
  
      cmd_1 = "ffmpeg -nostdin -i "+INPUT_VIDEO+" -ss " +initial+ " -vcodec h264 -vf fps=25 -to " +line+ " " +OUT_DIR+"/"+str(COUNT)+".avi"
  
  os.system(cmd_1)
  
      COUNT += 1
  
      initial=line

  I cant understand the problem :

  The error is as follows :

  ffmpeg version 4.0-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-libxml2 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libaom --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  Trailing options were found on the commandline.
  
  Input #0, avi, from '/data/binil/v2t_final/output/cnbctv18/2018_07_02_14_38_30/tmp/merged.avi':
  
    Metadata:
  
      encoder         : Lavf58.12.100
  
    Duration: 01:00:50.23, start: 0.000000, bitrate: 1334 kb/s
  
      Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p(progressive), 512x288 [SAR 1:1 DAR 16:9], 1001 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 639 kb/s
  
  At least one output file must be specified
  
  sh: line 1: /data/binil/v2t_final/output/cnbctv18/2018_07_02_14_38_30/1/1.avi: Permission denied

  Please help.
  This is some dummy text I am writing because it looks like stack overflow does not accept less description and more code. Please don’t mind these sentences. I cant believe that I am still writing this and it is still requesting me to add some more description. I am still doing it. Don’t know till what extent do I have to write. I hope this much is enough.

• HLS-streaming on VLC - cookies alternative

  5 juillet 2018, par unicornslayer

  I’m trying to build a streaming web api which creates m3u8 playlists of .ts files in .net core.

  I’ve built the live streaming option and it works fine on vlc.

  For example, in VLC -> File -> Open Network put my link : http://localhost:39986/api/Stream/MyChannel/index.m3u8 and VLC gives me the live version of the channel.

  But I need to implement the option of starting a video from a fixed time : http://localhost:39986/api/Stream/MyChannel/index.m3u8?timeStr="2018-07-04T17:16:01". In this case, I would need to create a session to know from which point to create the playlist, right ?[1]

  If so, sessions require an ID stored as a Cookie (right ?[2]). But from what I’ve read and what I’ve tested, vlc doesn’t support cookies.

  So my question is : is there any workaround for this scenario ?[3]

  It’s an university project and I am very confused about this task.

• ffmpeg - MXF with 4-channel audio : how to create proxies (high quality / small file size) and preserve the audio mapping

  8 juillet 2018, par WhatsYourFunction

  We’ve got MXF sources (h.264 video at UHD (3840x2160) with 4-channels of (4 - PCM S24 mono sources)
  We want Proxies — smallest file size at highest picture quality
  The compression applied to the video and audio essences can be anything,
  And the wrapper can be either MXF or QuickTime
  but we need to preserve the audio mapping (i.e. the Proxy must be 4-channel audio)

  How to do that with ffmpeg ?

  • EDIT Adding ffprobe :

  Metadata :

  uid : ***

  generation_uid : ***

  company_name : CANON

  product_name : EOS C300 Mark II

  product_version : 1.00

  product_uid : ***

  modification_date : 2018-06-28T08:29:24.000000Z

  material_package_umid : ***

  timecode : 02:50:31:17

  Duration : 00:06:35.40, start : 0.000000, bitrate : 395842 kb/s

  Stream #0:0 : Video : h264 (High 4:2:2 Intra), yuv422p10le(tv, progressive), 3840x2160, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23.98 tbn, 47.95 tbc

  Metadata :

   file_package_umid: ***

  Stream #0:1 : Audio : pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s

  Metadata :

   file_package_umid: ***

  Stream #0:2 : Audio : pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s

  Metadata :

   file_package_umid: ***

  Stream #0:3 : Audio : pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s

  Metadata :

   file_package_umid: ***

  Stream #0:4 : Audio : pcm_s24le, 48000 Hz, 1 channels, s32 (24 bit), 1152 kb/s

  Metadata :

   file_package_umid: ***