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• Duration of source video and subtracted audio are different

  22 avril 2018, par zpc

  The duration of source video and subtracted wav audio is different , why ?

  I’m recorgnizing subtitle from audio, and I need to add subtitle back to video. So I want the duration of audio and video the same.

  ffmpeg -i http://cdn.live.360.cn/huikan_news/vod-media/_XW_203286B417B7C6466B3B_20160627185953.m3u8 -vn test.wav -y

  My CLI :

  [zhangpengcheng@mobiledev03v ifly]$ ffprobe http://cdn.live.360.cn/huikan_news/vod-media/_XW_203286B417B7C6466B3B_20160627185953.m3u8 2>&1 | grep Duration
  
    Duration: 00:06:51.99, start: 1.400000, bitrate: 0 kb/s
  
  
  
  
  
  [zhangpengcheng@mobiledev03v ifly]$ ffmpeg -i http://cdn.live.360.cn/huikan_news/vod-media/_XW_203286B417B7C6466B3B_20160627185953.m3u8 -vn test.wav -y
  
  ffmpeg version 3.1.3 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
  
    configuration: --prefix=./build/ --enable-shared --enable-static --enable-libx264 --enable-avisynth --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libopencv --enable-librtmp --enable-gpl --enable-nonfree
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, hls,applehttp, from 'http://cdn.live.360.cn/huikan_news/vod-media/_XW_203286B417B7C6466B3B_20160627185953.m3u8':
  
    Duration: 00:06:51.99, start: 1.400000, bitrate: 0 kb/s
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p(tv, smpte170m/bt709/bt709), 668x376, 15 tbr, 90k tbn, 180k tbc
  
      Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 65 kb/s
  
  [wav @ 0x10182e0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, wav, to 'test.wav':
  
    Metadata:
  
      ISFT            : Lavf57.41.100
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s
  
      Metadata:
  
        encoder         : Lavc57.48.101 pcm_s16le
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help
  
  size=   31904kB time=00:06:51.84 bitrate= 634.6kbits/s speed= 146x    
  
  video:0kB audio:31904kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000239%
  
  
  
  
  
  [zhangpengcheng@mobiledev03v ifly]$ ffprobe test.wav 2>&1 | grep Duration
  
    Duration: 00:06:10.40, bitrate: 705 kb/s

• Choose download resolution in m3u8 list with ffmpeg

  31 mars 2024, par Bruno Andrade

  I'm trying to download video from a m3u8 playlist using ffmpeg but I do not know how to choose the resolution to download. Currently the command is downloading the highest version

  



  the command I am using is :

  



  /home/user/bin/ffmpeg -user_agent "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0" -i "https://sitevideo.com/list.m3u8" -c copy "/home/file/video.ts"


  



  My list is this

  



  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=400000,NAME="low"
size1.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=800000,NAME="med"
size2.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=1900000,NAME="best"
size3.m3u8


  


• Converting MP4 to HLS via ffmpeg producing stream with start delay

  24 mai 2018, par Eugene Alexeev

  I’m trying to convert mp4 to hls via this FFMpeg command :

  ffmpeg -i 1.mp4 -vcodec copy -q:v 5 -hls_time 5 -hls_list_size 0 -f hls 1.m3u8

  Command is working fine, without any errors whatsoever. BUT, when I’m trying to play brand-new HLS stream locally I noticed that it has a fixed start delay. I checked metadata of stream with ffprobe 1.m3u8 And that’s what I got :

  Input #0, hls,applehttp, from '1.m3u8':
 Duration: 00:00:11.17, start: 1.400000, bitrate: 0 kb/s
 Program 0
   Metadata:
     variant_bitrate : 0
   Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, smpte170m/bt709/bt709), 720x1280, 30 fps, 30 tbr, 90k tbn, 180k tbc
   Metadata:
     variant_bitrate : 0

  As you can see, parameter start has value of 1.400000 and I believe that’s the reason of this annoying start delay. My question is - how can I get rid of that ?

  I tried to set start time with -ss flag but it doesn’t affect an output at all. Also input is perfectly fine, I tried to convert it with the same command but to .mp4 and I got correct results. Am I missing something here ? I would be very appreciated for any help. Thanks.