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• Link ffmpeg to Pydub in Serverless layer

  15 mars 2021, par akai

  I'm using the Serverless framework to deploy an app on AWS. I have created a layer, defined as follows in serverless.yml :

  


  layers:
  ffmpeg:
    path: layer


  


  I also excluded it from the main file bundle :

  


  package:
  exclude:
    - layer/**


  


  and defined a lambda function :

  


   cut_audio:
    layers:
      - {Ref: FfmpegLambdaLayer}


  


  In this function I use the Pydub library, which needs to access the ffmpeg layer. At the moment I have the following error FileNotFoundError: [Errno 2] No such file or directory: 'ffprobe', meaning I have to link ffmpeg as AudioSegment.converter(path)

  


  How do I get the path of my layer ?

  


  Edit : could I solve this by bundling both Pydub and ffmpeg in the layer ?

  


  Edit 2 : the eziotedeschi/AWS-Lambda-Layer-Pydub github repository doesn't seem to help. I get the following error No module named 'pydub'. I am using Python3.8 as runtime, that might be the issue.

  


• avcodec/cbs_av1 : fix setting FrameWidth in frame_size_with_refs()

  24 août 2020, par James Almer

  avcodec/cbs_av1 : fix setting FrameWidth in frame_size_with_refs()
  Section 5.9.7 of the spec states
      UpscaledWidth = RefUpscaledWidth[ ref_frame_idx[ i ] ]
  
      FrameWidth    = UpscaledWidth
  
      FrameHeight   = RefFrameHeight[ ref_frame_idx[ i ] ]
  
      RenderWidth   = RefRenderWidth[ ref_frame_idx[ i ] ]
  
      RenderHeight  = RefRenderHeight[ ref_frame_idx[ i ] ]
  Meaning FrameWidth must not be set to RefFrameWidth[ ref_frame_idx[ i ] ]
  
  like we're currently doing.
  Reviewed-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/cbs_av1_syntax_template.c

• Why does HTML5 video with very large mp4 (with +faststart, ie metadata at beginning), take ages to load ?

  8 septembre 2015, par Tom Jenkinson

  The video is rendered with ffmpeg with the "faststart" flag added meaning the metadata should be at the start of the file, and the server appears to be handling partial content requests correctly, so why does it need to have downloaded so much of the video before the player becomes enabled and can play the video ? I am testing it in Google Chrome.

  Once the player becomes enabled I can seek around to various points in the video pretty instantly and see the new partial content requests being made.

  Here is a link to the video : http://iptv.la1tv.co.uk/unibrass.mp4

  Here is a jsbin with the video tag : https://jsbin.com/rahewidoru . It takes a few minutes but does work after it loads.

  Any suggestions ?

  I realise there are other methods like HLS and dash which use chunks, but I would like to know why it isn’t working this way because I can’t find anywhere that provides a reason as to why it doesn’t work well.