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• h274 : remove optimization pragma

  25 août 2021, par Lynne

  h274 : remove optimization pragma
  This results in warnings on compilers which don't support it,
  
  objections were raised during the review process about it but went unnoticed,
  
  and the speed benefit is highly compiler and version specific, and
  
  also not very critical.
  We generally hand-write assembly to optimize loops like that, rather
  
  than use compiler magic, and for 40% best case scenario, it's simply
  
  not worth it.
  Plus, tree vectorization is still problematic with GCC and disabled by default
  
  for a good reason, so enabling it locally is sketchy.
  

  • [DH] libavcodec/h274.c

• Concatenating Smooth Streaming output to a single MP4 file - problems with A/V sync. What is CodecPrivateData ?

  14 février 2021, par user15180344

  I have a video in fragmented form which is an output of an Azure Media Services Live Event (Smooth Streaming).

  


  I'm trying to concatenate the segments to get a single MP4 file, however I've run into a A/V sync problem - no matter what I do (time-shifting/speeding up/slowing down/using FFmpeg filters), the audio delay is always floating. To get the output MP4 file, I tried concatenating the segments for video and audio streams (both at OS file level and with FFmpeg) and then muxing with FFmpeg.

  


  I've tried everything I found on the web and I'm always ending up with exactly the same result. What's important, when I play the source from the manifest file, it's all good. That made me skim through the manifest once again, and I realized there's CodecPrivateData value which I'm not using anywhere in the process. What is it ? Could it somehow help solving my problem ?

  


• How to make ffmpeg available inside my Docker container ?

  26 août 2019, par vcamargo

  I’m currently trying to run a ffmpeg Docker image inside my own container with docker-compose using the depends_on clause. But when I try to reach ffmpeg inside my code, it seems like it’s not available system-wide and I get an error. I believe I’m misconfiguring Docker.

  My current Dockerfile is as follows :

  FROM node:9
  
  
  
  WORKDIR /usr/app
  
  
  
  COPY package*.json ./
  
  
  
  RUN npm install --quiet
  
  
  
  COPY . .

  And my docker-compose.yml :

  version: '3'
  
  services:
  
    app:
  
      build: .
  
      command: npm run dev
  
      volumes:
  
      - .:/usr/app/
  
      - /usr/app/node_modules
  
      ports:
  
        - "3000:3000"
  
      depends_on:
  
        - ffmpeg
  
    ffmpeg:
  
      image: jrottenberg/ffmpeg:3.3

  When I run docker-compose up I can see that the ffmpeg is actually working, but then my application proceeds to start and it seems that ffmpeg ceases to work.