title: Live streaming .webm file with ffmpeg and nginx
body: <p>Hi I am new to <code>ffmpeg</code> and I need some help with live streaming of <code>.webm</code> file which is still being written into. I have a <code>.webm</code> file containing only video in vp9 codec<code>which needs to be live streamed (preferably without transcoding and streamed using</code> DASH`. I have compiled nginx along with nginx-ts-module from (<a href="https://github.com/arut/nginx-ts-module#features" rel="nofollow noreferrer">https://github.com/arut/nginx-ts-module#features</a>) with the following configuration</p>
  
  <pre><code>nginx version: nginx/1.12.1
  built by gcc 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) 
  built with OpenSSL 1.0.1f 6 Jan 2014
  TLS SNI support enabled
  configure arguments: --with-cc-opt='-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_sub_module --with-stream=dynamic --with-stream_ssl_module --with-stream_ssl_preread_module --with-mail=dynamic --with-mail_ssl_module --add-dynamic-module=/home/ubuntu/NGINX/nginx-ts-module-master
  </code></pre>
  
  <p>The mediafile has the following properties(obtained with mediainfo):</p>
  
  <pre><code>General
  Complete name                            : video_4_1_Admin_0.webm
  Format                                   : WebM
  Format version                           : Version 2
  File size                                : 19.7 MiB
  Duration                                 : 1ms
  Overall bit rate                         : 165 Gbps
  Writing library                          : libwebm-0.2.1.0
  Video
  ID                                       : 1
  Format                                   : VP9
  Codec ID                                 : V_VP9
  Width                                    : 320 pixels
  Height                                   : 180 pixels
  Display aspect ratio                     : 16:9
  Frame rate mode                          : Variable
  Language                                 : English
  Default                                  : Yes
  Forced                                   : No
  </code></pre>
  
  <p>I am trying to stream the file with the following</p>
  
  <pre><code>ffmpeg -re -i video_4_1_Admin_0.webm -bsf:v vp9_superframe -c copy -f webm_chunk  http://127.0.0.1:8000/publish/sintel
  </code></pre>
  
  <p>And I am getting the following error</p>
  
  <pre><code>Input #0, matroska,webm, from 'video_4_1_Admin_0.webm':
    Metadata:
      encoder         : libwebm-0.2.1.0
    Duration: 00:00:00.00, start: 0.000000, bitrate: 174444152 kb/s
      Stream #0:0(eng): Video: vp9 (Profile 0), yuv420p(tv), 320x180, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
  Output #0, webm_chunk, to 'http://127.0.0.1:8000/publish/sintel':
  Output file #0 does not contain any stream
  </code></pre>
  
  <p>I am not sure what are the exact options to be passed to <code>ffmpeg</code> so that it creates the <code>.mpd</code> and needed chunks which will allow me to LiveStream the media, I tried replacing the options given in the example (<a href="https://github.com/arut/nginx-ts-module#features" rel="nofollow noreferrer">https://github.com/arut/nginx-ts-module#features</a>) with what seems like <code>vp9</code> equivalent., but, I am not sure. Can someone help me out here? Thanks in advance</p>