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  • webm dash encoding... What are the correct ffmpeg parameters ?

    24 avril 2020, par Dean

    I'm stumped with encoding videos into a dash compliant format. I'm going from .mp4 to .webm

    



    Firstly, I am running OS X and ffmpeg 2.5.4.

    



    Here's the encoding commands I am using in my test (I got these from here) :

    



    ffmpeg -i IMG_0113.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 25k -g 1 -tile-columns 4 -frame-parallel 1 -an -f webm -dash 1 video_160x90_25k.webm

ffmpeg -i IMG_0113.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 50k -g 1 -tile-columns 4 -frame-parallel 1 -an -f webm -dash 1 video_160x90_50k.webm

ffmpeg -i IMG_0113.mp4 -vn -acodec libvorbis -ab 128k  -dash 1 audio_128k.webm

ffmpeg -f webm_dash_manifest -i video_160x90_25k.webm -f webm_dash_manifest -i video_160x90_50k.webm -f webm_dash_manifest -i audio_128k.webm -c copy -map 0 -map 1 -map 2 -f webm_dash_manifest -adaptation_sets "id=0,streams=0,1 id=1,streams=2" manifest.mpd


    



    Secondly, the problem is not with my server, as I have downloaded the samples from here, and they work 100% on the dash.js player when served from my local server.

    



    Please could someone out there point me in the right direction ? Or provide a sample of the ffmpeg commands used to get the output format correct.

    



    Thanks,
Dean.

    


  • webm dash encoding... What are the correct ffmpeg parameters ?

    4 septembre 2015, par DeanL

    I’m stumped with encoding videos into a dash compliant format. I’m going from .mp4 to .webm

    Firstly, I am running OS X and ffmpeg 2.5.4.

    Here’s the encoding commands I am using in my test (I got these from here) :

    ffmpeg -i IMG_0113.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 25k -g 1 -tile-columns 4 -frame-parallel 1 -an -f webm -dash 1 video_160x90_25k.webm
    

    
ffmpeg -i IMG_0113.mp4 -c:v libvpx-vp9 -s 160x90 -b:v 50k -g 1 -tile-columns 4 -frame-parallel 1 -an -f webm -dash 1 video_160x90_50k.webm
    

    
ffmpeg -i IMG_0113.mp4 -vn -acodec libvorbis -ab 128k  -dash 1 audio_128k.webm
    

    
ffmpeg -f webm_dash_manifest -i video_160x90_25k.webm -f webm_dash_manifest -i video_160x90_50k.webm -f webm_dash_manifest -i audio_128k.webm -c copy -map 0 -map 1 -map 2 -f webm_dash_manifest -adaptation_sets "id=0,streams=0,1 id=1,streams=2" manifest.mpd

    Secondly, the problem is not with my server, as I have downloaded the samples from here, and they work 100% on the dash.js player when served from my local server.

    Please could someone out there point me in the right direction ? Or provide a sample of the ffmpeg commands used to get the output format correct.

    Thanks,
    Dean.

  • Create MPEG-DASH Initialization segment

    5 janvier 2016, par Mahout

    I am looking to convert between HLS and MPEG Dash. I do not access to the original fully concatenated video file, only the individual HLS segments.

    In doing this transformation to MPEG Dash I need to supply an initialziation segment for the Dash manifest .mpd file.

    My questions are :

    1. What is the structure of a Dash video initialization segment ?
    2. How can I generate/create one without the need for the original full file ?

    Perhaps a solution would involve getting MP4Box to convert the ’.ts’ HLS segments to Dash ’.m4s’ segments which are self initializing, but I am unsure how to go about this this ?

    Any ideas are much appreciated.

    Many thanks.

    UPDATE :
    Snippet to stream using original hls segments. Video plays all the way through but is just black.

      <representation width="426" height="238" framerate="25" bandwidth="400000">
    
    <segmentlist timescale="25000" duration="112500">
    
           <segmenturl media="video_0_400000/hls/segment_0.ts"></segmenturl>
    
           <segmenturl media="video_0_400000/hls/segment_1.ts"></segmenturl>
    
          <segmenturl media="video_0_400000/hls/segment_2.ts"></segmenturl>
    
    </segmentlist>
    
   </representation>

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