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• How to make HLS start from the begining

  15 juillet 2016, par Ariel Argañaraz

  I need some help with HLS streaming, I’m trying to create a playlist for streaming,

  I’m using ffmpeg to generate the files and the .m3u8 files. And for playing i’m using a web page with videojs player

  The idea is to simulate a live streaming using files already created.

  The problem is that in some version of iphone works and in another does not work.
  The problem is that when I start play the video in the Safari browser of my phone it freezes for a while and then download and play the last segment.

  for example if the video is split in 4 differents .ts files.
  It starts playing from the 4th .ts file and then stop.

  The problem is that I have 2 iphone mobile phone, one of them works perfectly but the other one not

  The not working cell phone is a iphone 6 (version 9.2.1)

  Here is my m3u8 file. Note that I’m using the #EXT-X-PLAYLIST-TYPE:EVENT and I remove the #EXT-X-ENDLIST from the botton. So it should be played as an live streaming.

  It works for another phones, it begins from the 0 second when I set the #EXT-X-START:TIME-OFFSET=0

  but in this version (9.2.1) the video freezes and then jumps to the last segment (webinar-3.ts) plays that segment and finally stop.

  #EXTM3U
  
  #EXT-X-VERSION:4
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:NO
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  #EXT-X-START:TIME-OFFSET=0
  
  #EXT-X-TARGETDURATION:6
  
  #EXTINF:5.046444,
  
  webinar-0.ts
  
  #EXTINF:5,
  
  webinar-1.ts
  
  #EXTINF:5,
  
  webinar-2.ts
  
  #EXTINF:5,
  
  webinar-3.ts

  Have anybody got an idea of what i’m doing wrong or how to get a m3u8 config that works for this iphone version ?

• ffmpeg seeking in HLS m3u8 video

  15 décembre 2016, par VixinG

  I’m having problem seeking in m3u8 hls video.
  The m3u8 has 9-10 sec .ts fragments, with #EXTINF:<time>,</time> before each fragment.

  The entire video is 5 hours long and I’m trying to get clip from 3:10:00 to 3:45:00 like this :

  ffmpeg -ss 3:10:00 -i 'http://example.com/v/vod.m3u8' -t 0:35:00 -c:v copy -bsf:a aac_adtstoasc out.mp4

  When I execute that, it just waits forever. I tried both on Windows and Linux with the latest and older version of FFmpeg. I waited for like an hour yesterday and it didn’t do anything. Log :

  Input #0, hls,applehttp, from 'http://example.com/v/vod.m3u8':
  
    Duration: 05:25:27.08, start: 60.000000, bitrate: 0 kb/s
  
    Program 0
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 159 kb/s
  
      Stream #0:1: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Stream #0:2: Data: timed_id3 (ID3  / 0x20334449)
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf57.41.100
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1920x1080, q=2-31, 30 fps, 30 tbr, 90k tbn, 90k tbc
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.48.101 aac
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help

  And it stays like this forever.

  How can I seek to 3h10m without having to download the entire 5h25m ?
  -ss doesn’t seem to do much

  Is it supposed to go so slow or is the m3u8 corrupted ? It looks like this inside :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:6
  
  #ID3-EQUIV-TDTG:2015-12-16T03:24:26
  
  #EXT-X-PLAYLIST-TYPE:EVENT
  
  
  
  #EXT-X-ELAPSED-SECS:0.0
  
  #EXT-X-TOTAL-SECS:19527.08
  
  #EXTINF:9.268,
  
  index-00000-vdyz-0.ts
  
  #EXTINF:10.000,
  
  index-00001-AiD9-0.ts
  
  (...)

  And it has 12x #EXT-X-DISCONTINUITY, every 174 parts.

  When I use VLC or any other player to open the m3u8 directly I can seek without problem and it’s instant. FFmpeg doesn’t seem to use the same method of seeking, or it’s broken.

  To see what I mean, try seeking on this m3u8 :

  http://vod167-ttvnw.akamaized.net/07e4ac668a/lirik_7709808752_7709808752/chunked/index-dvr.m3u8

  and try fast-seeking (-ss before input) to 2:30:00 and exporting 1 frame with frames:v 1 out.jpg

• ffmpeg hls with aes encryption

  24 novembre 2016, par Ankit Vimal

  I was trying to create an encrypted hls stream using ffmpeg. I’ve seen other questions related to this.
  I’ve created a video.key file with the following content :

  12345678901234567890123456789011

  I’ve also created a key_info file with the following contents :

  http://10.10.102.223:59164/trial/video.key
  
  video.key

  I have a mp4 file : jellies.mp4
  and I was trying to transcode and encrypt it using

  ffmpeg -i jellies.mp4 -hls_time 5 -hls_key_info_file key_info playlist.m3u8

  After I was done transcoding I put the folder on a server and tried to access it on a client android app.

  The app contains a VideoView to which the url is fed. And I believe that decryption is done automatically.

  But the app is not working . It shows the following errors :

  E/MediaPlayer: error (1, -1007)

  After this I tried the transcoding again ,this time without encryption ,using :

  ffmpeg -i jellies.mp4 -hls_time 5 playlist.m3u8

  This played perfectly on the app.

  Using packet capture I’m able to see the various packets sent and received .

  And the key is being received perfectly.

  Then why is the stream not working.

  Is it because I didn’t encrypt it properly ? And how do I fix it ?