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• random .ts filenames in the m3u8 file

  14 octobre 2016, par Arya Same

  Hi guys my ffmpeg line currently looks like this

  ffmpeg -i "http://x.com/x.ts" -s 810x520 -pix_fmt yuv420p -vcodec copy -acodec copy -bsf:v h264_mp4toannexb -preset baseline  -strict -2 -flags -global_header -f segment -segment_list "E:\2.m3u8"  -segment_time 10 -segment_list_size 5 "E:\2-%%3d.ts"

  it generates .ts files like 1.ts 2.ts etc..

  but if you are gonna to look to twitch.tv’s m3u8 file it looks like this

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:3
  
  #ID3-EQUIV-TDTG:2016-10-14T12:33:35
  
  #EXT-X-MEDIA-SEQUENCE:345
  
  #EXT-X-TWITCH-ELAPSED-SYSTEM-SECS:1368.979
  
  #EXT-X-TWITCH-ELAPSED-SECS:1365.240
  
  #EXT-X-TWITCH-TOTAL-SECS:1386.919
  
  #EXTINF:3.440,
  
  index-0000000346-Am9S.ts
  
  #EXTINF:1.720,
  
  index-0000000347-Am3j.ts
  
  #EXTINF:3.980,
  
  index-0000000348-MYfR.ts
  
  #EXTINF:2.000,
  
  index-0000000349-kIwd.ts
  
  #EXTINF:3.300,
  
  index-0000000350-TpwI.ts
  
  #EXTINF:3.500,
  
  index-0000000351-MAjv.ts

  i want to do same is there any example ?
  thanks.

  best regards

• ffmpeg : recommended bitrate vs resolution [duplicate]

  15 octobre 2016, par Santhosh Yedidi

  This question already has an answer here :

  • FFMPEG sensible defaults
    
    2 answers
    

  I have high resolution video

    Duration: 00:06:28.80, start: 0.000000, bitrate: 15968 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 15809 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-11 05:35:02
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 157 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-11 05:35:02
  
        handler_name    : Alias Data Handler

  Its 6+min video.

  I am ok with resolution of 240p (because i want to send it on whatsapp)

  In order my video to look good quality what is the recommended bitrate for 240p. Also is what is the minimum bitrate below which the chances of pixelating will be there in the video.

  I dont want to go for high bitrate also. Because ultimately i want the size to be not more than 240p.

  I use mpv to see the video. I scale the original video to 240p, the quality after conversion should match the quality visible in mpv. That will give me first hand idea of how good is the conversion.

  I expect a good amount of reduction in size(MB : where original is 740mb) of the file when reduced from 1920x1080 to 240p

  I have found some information regarding this.

  

  How much is this true

• ffmpeg incorrect duration when converting video to HLS

  12 octobre 2016, par Julie Bsd

  I’m facing an issue using ffmpeg to convert video, precisely mp4 video => Http Live Streaming (HLS)

  Once converted to HLS, the .m3u8 file has a wrong duration (e.g : 20,1s instead of 20.00s), causing bugs when playing it with AVPlayer on iOS.
  Playing the video with Safari cause the same issue.

  Example :
  1) Open Safari
  2) Play this video that i’ve converted
  3) Look at the download progression, stopped at 98% cause of wrong duration.
  
  4) When you slide between 98% and 100%, the video player can crash.

  ---

  EDIT 1 :

  I’ve edited the command line

   ffmpeg -i  video.mp4 \
  
   -codec copy \
  
   -acodec copy \
  
   -map 0 -f ssegment -g 60 -sc_threshold 0 \
  
   -segment_list playlist.m3u8 \
  
   -segment_list_flags +live \
  
   -segment_time 2 media%05d.ts \
  
    >./log_ffmpeg 2>./log_ffmpeg

  LOG :

  ffmpeg version 3.1.4-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.4.1 (Debian 5.4.1-2) 20160904
  
    configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libzimg --cc=gcc-5 --disable-ffplay
  
    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, mov,mp4,m4a,3gp,3g2,mj2, from './Comptes/1/Photos/306/original_video.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      creation_time   : 2016-10-12 14:29:51
  
    Duration: 00:00:20.00, start: 0.000000, bitrate: 1673 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, 1563 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 101 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Audio
  
  [stream_segment,ssegment @ 0x652ed80] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  
  
  Output #0, stream_segment,ssegment, to './Comptes/1/Photos/306/media%05d.ts':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp41mp42isom
  
      encoder         : Lavf57.41.100
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, q=2-31, 1563 kb/s, 30 fps, 30 tbr, 90k tbn, 600 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Video
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, 101 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-10-12 14:29:51
  
        handler_name    : Core Media Audio
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  601 fps=0.0 q=-1.0 Lsize=N/A time=00:00:20.10 bitrate=N/A speed= 917x    
  
  video:3823kB audio:249kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  m3u8 file :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:3
  
  #EXTINF:2.033333,
  
  media00000.ts
  
  #EXTINF:2.000000,
  
  media00001.ts
  
  #EXTINF:2.000000,
  
  media00002.ts
  
  #EXTINF:2.000000,
  
  media00003.ts
  
  #EXTINF:2.000000,
  
  media00004.ts
  
  #EXTINF:2.000000,
  
  media00005.ts
  
  #EXTINF:2.000000,
  
  media00006.ts
  
  #EXTINF:2.000000,
  
  media00007.ts
  
  #EXTINF:2.000000,
  
  media00008.ts
  
  #EXTINF:2.000000,
  
  media00009.ts
  
  #EXTINF:0.033333,
  
  media00010.ts
  
  #EXT-X-ENDLIST

  As you can see input duration =/= output duration
  input duration : 20s
  output duration 20.1s