Advanced search

On other websites (6348)

• Problem to convert Mp4 to MPEG DASH with FFMPEG codec Vp9 in linux

  4 March 2020, by Sean Pribadi

  i need to convert mp4 to mpeg Dash and stream .Mpd with dash.js. everything looks fine on windows, but there are trouble when i generate Mpd in linux.
  Step by step in windows :
  1. run

  ffmpeg -y -i video.mp4 -map 0:0 -map 0:0 -map 0:1 -c:v libvpx-vp9 -b:v:0 800k -b:v:1 200k -s:v:1 320x170 -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -use_timeline 1 -use_template 1 -adaptation_sets "id=0,streams=v id=1,streams=a" -f dash config.mpd

  2. stream config.mpd, init, and chunk file with dash.js player.
     everything work when i run ffmpeg on windows

  when i ran on linux :
  1. run

  ffmpeg -y -i video.mp4 -map 0:0 -map 0:0 -map 0:1 -c:v libvpx-vp9 -b:v:0 800k -b:v:1 200k -s:v:1 320x170 -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -use_timeline 1 -use_template 1 -adaptation_sets "id=0,streams=v id=1,streams=a" -f dash config.mpd

  no error and everything looks good. But when i stream with dash.js.
  

  2. stream with dash.js player
     when i stream config.mpd with dash.js player, there are infinity request enter image description here

  what i have tried :
  1. change init-stream build by linux with init-stream build by windows [Work]
  2. change codec to libx264 [also work in linux]

  the problem is just convert video to MPEG dash with webm codec (vp8/Vp9) in linux

• FFMPEG Dash with tiles of thumbnail images

  31 July 2020, by martyn Gilbert

  As of DASH-IF IOP version 4.2, section 6.2.6 defines the notion of image-based tracks in DASH:
https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf.

  



  This is the ability to have an adaption set made up of mime type images that themselves are a strip of low resolution thumbnails. 
A player will use these thumbnails when the user hovers their mouse over the video timeline and get a 
preview of the the frame at that approximate timecode.

  



  Theo player website has a page dedicated to this function for playback:
https://www.theoplayer.com/blog/in-stream-thumbnail-support-dvr-dash-streams

  



  I need to generate a dash stream (not live) using ffmpeg that also contains these thumbnails. 
I already have an ffmpeg command that will generate the film strip of jpgs which outputs a thumbnail every 5 seconds of input video and joins 5 of these together in a single jpg:

  



  ffmpeg -i INPUT -q:v 20 -vf "select=not(mod(n\,125)),scale=480:270,tile=5x1" -vsync vfr output%d.jpg

  



  and the mpeg dash itself:

  



  ffmpeg -i INPUT -y -map 0 -acodec aac -ac 2 -ar 48000 -s 960x540 -vcodec libx264 -f dash -preset veryfast -b:v:2 1500k -seg_duration 2 output.mpd

  



  But I cannot find a way in ffmpeg to include the thumbnails in the dash mpd file.

  


• How can I batch/sequentially download m3u8 files using ffmpeg?

  20 February 2020, by Yesterdec

  I’m currently downloading m38u playlists individually using the following on Mac:

  ffmpeg -i <"URL with m3u8"> -codec copy output.ts

  If I want to do multiple files, I currently do it from separate Terminal windows.

  What I would like to do is, in a single instance, tell ffmpeg to e.g. take URLs from a .txt file and download them in sequence, with a sequential output name for each (fine for them to all go in same output folder).

  Sample code from m3u8 file:

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXT-X-TARGETDURATION:9
  
  #EXTINF:8.333333,
  
  segment00000.ts
  
  #EXTINF:8.333333,
  
  segment00001.ts
  
  #EXTINF:8.333333,
  
  segment00002.ts
  
  #EXTINF:5.000000,
  
  segment00003.ts
  
  #EXTINF:8.333333,
  
  segment00004.ts
  
  #EXTINF:8.333333,
  
  segment00005.ts

  I certainly have homebrew installed - I’m a novice, so unsure whether that means I’m actively ’using’ it to manage packages

  The file with the list of of m3u8 addresses is currently located at /Users/username/Downloads/m38u hold list.txt and looks like this:

  https://streaming.imvbox.com/media/2825/1280x800/1280x800.m3u8
  
  https://streaming.imvbox.com/media/2298/1280x800/1280x800.m3u8
  
  https://streaming.imvbox.com/media/2822/1280x800/1280x800.m3u8
  
  https://streaming.imvbox.com/media/2821/1280x800/1280x800.m3u8
  
  https://streaming.imvbox.com/media/2820/1280x800/1280x800.m3u8
  
  https://streaming.imvbox.com/media/2088/1280x800/1280x800.m3u8

  But so far this file is simply a place to store the links - I haven’t used it anything other than to copy the links from.