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• ERROR : unsatisfiable constraints : so:libvpx.so.6 (missing)

  17 janvier 2021, par Valeed Malik

  FFMpeg was updated this week and is causing the build to break.

  



  Are my options to either :

  



  

  1. pin ffmpeg to a previous version ? If so, how do I pin to the version before current ?

  


  2. Update the python dockerfile version

  


  



  Output :

  



  Step 8/42 : RUN apk add  --no-cache ffmpeg
 ---> Running in 9e46540ed393
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
fetch http://dl-8.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  so:libvpx.so.6 (missing):
    required by:
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
                 ffmpeg-libs-4.1.1-r2[so:libvpx.so.6]
The command '/bin/sh -c apk add  --no-cache ffmpeg' returned a non-zero code: 3
ERROR: Job failed: exit code 3
FATAL: exit code 3                         


  



  Dockerfile :

  



  FROM python:3.6.7-alpine

ENV LANG C.UTF-8
RUN echo "http://dl-8.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
RUN apk upgrade


RUN addgroup -S django && adduser -S -G django django

RUN apk update
# FFMPEG/Sox dependencies
RUN apk add sox
#RUN apk add  --no-cache libvpx-dev
RUN apk add  --no-cache ffmpeg


  


• Merge commit ’136f55207521f0b03194ef5b55ba70f1635d6aee’

  20 mars 2017, par Clément Bœsch

  Merge commit ’136f55207521f0b03194ef5b55ba70f1635d6aee’
  * commit ’136f55207521f0b03194ef5b55ba70f1635d6aee’ :
  
    mpegvideo_motion : Handle edge emulation even without unrestricted_mv
  This commit is a noop, see 7b1e0beb2da31a0a8847bc9c68a87a120b71fa8a
  Merged-by : Clément Bœsch <u@pkh.me>
  

• Play HLS segments through Media source extensions

  11 février 2018, par ler

  I got a list of m4s and init.mp4 from this FFMPEG command

  ffmpeg -i bunny.mp4 -f hls -hls_segment_type fmp4 -c:v copy playlist.m3u8

  I send those chunks using Socketand try to play them through MSE.
  When i send them in this order :

  init.mp4 + playlist0.m4s + playlist1.m4s ...

  They play without any problem, But when i want to start from the chunk number 3 meaning init.mp4 + playlist3.m4s for example i get this error :

  video frame with PTS 0us has negative DTS -80000us after applying timestampOffset, handling any discontinuity, and filtering against append window.

  I want to be able to start from any chunk, currently the only way to play the video is to star by init.mp4 + playlist0.m4s meaning playlist0.m4s because init.mp4 contain just headers of the video, This is the client code i’m using :

  var socket = io();
  
  var video = document.querySelector('video');
  
  var mimeCodec = 'video/mp4; codecs="avc1.64000d,mp4a.40.2"'; // true
  
  if ('MediaSource' in window && MediaSource.isTypeSupported(mimeCodec)) 
  
  {
  
      var mediaSource = new MediaSource;
  
      video.src = URL.createObjectURL(mediaSource);
  
      mediaSource.addEventListener('sourceopen', function () {
  
              var mediaSource = this;
  
              var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  
             sourceBuffer.mode = 'segments'; 
  
              sourceBuffer.addEventListener('updateend', function (_) { video.play().then(function() { }).catch(function(error) { }); });
  
              socket.on('broadcast', function (chunk) {
  
                  downloadData(chunk.uri, function(arrayBuffer) {
  
                      sourceBuffer.appendBuffer(arrayBuffer);
  
                  });
  
              });
  
      });
  
  } else {
  
      console.error('Unsupported MIME type or codec: ', mimeCodec);
  
  }
  
  function downloadData(url, cb) {
  
      var xhr = new XMLHttpRequest;
  
      xhr.open('get', url);
  
      xhr.responseType = 'arraybuffer';
  
      xhr.onload = function () {
  
          cb(new Uint8Array(xhr.response));
  
      };
  
      xhr.send();
  
  }