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• Why is PowerShell Eating my Dash

  11 novembre 2017, par gvkv

  In a directory vidtemp with files : G*53.mp4 (a series of GoPro videos) using PowerShell 5.0 :

  PS C:\Users\gvkv\vidtemp $sources = Get-ChildItem -Filter *53*
  
  PS C:\Users\gvkv\vidtemp $vin = [String]::Join(" ", $($sources | %{"-i $($_.Name)"}))
  
  PS C:\Users\gvkv\vidtemp $vin
  
  -i GOPR0053.MP4 -i GP010053.MP4 -i GP020053.MP4 -i GP030053.MP4 -i GP040053.MP4 -i GP050053.MP4
  
  
  
  PS C:\Users\gvkv\Videos\hockeytemp\tt\trw> $concat = [String]::Join(" ", `
  
  >> $(0..$($sources.count-1) | `
  
  >> %{"[$($_):v:0] [$($_):a:0]"}) + "concat=n=$($sources.count):v=1:a=1 [v] [a]" `
  
  >> )
  
  PS C:\Users\gvkv\vidtemp $concat
  
  PS C:\Users\gvkv\vidtemp [0:v:0] [0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] [3:v:0] [3:a:0] [4:v:0] [4:a:0] [5:v:0] [5:a:0] concat=n=6:v=1:a=1 [v] [a]
  
  PS C:\Users\gvkv\vidtemp ffmpeg $vin `
  
  >> -filter_complex $concat -map '[v]' -map '[a]' `
  
  >> -c:v -crf 21 -preset slow 
  
  >> out.53.mp4
  
  ...
  
  Unrecognized option 'i GOPR0053.MP4 -i GP010053.MP4 -i GP020053.MP4 -i GP030053.MP4 -i GP040053.MP4 -i GP050053.MP4'. 
  
  ndError splitting the argument list: Option not found

  Note there’s no "-" on the first i. What’s happening and what do I do about it ?

• EC2 for video-encoding

  4 avril 2019, par Naftuli Kay

  I have a potential job which will require me to do some video encoding with FFMPEG and x264. I’ll have a series of files which I’ll need to encode once, then I’ll be able to bring down the instances. Since I’m not really sure of the resource utilization of x264 and FFMPEG, what kind of instances should I get ? I’m thinking either a

  High-CPU Extra Large Instance

  7 GB of memory
  20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
  1690 GB of instance storage
  64-bit platform
  I/O Performance : High
  API name : c1.xlarge

  or, alternatively a

  Cluster GPU Quadruple Extra Large Instance

  22 GB of memory
  33.5 EC2 Compute Units (2 x Intel Xeon X5570, quad-core “Nehalem” architecture)
  2 x NVIDIA Tesla “Fermi” M2050 GPUs
  1690 GB of instance storage
  64-bit platform
  I/O Performance : Very High (10 Gigabit Ethernet)
  API name : cg1.4xlarge

  What should I use ? Does x264/FFMPEG perform better with faster/more CPUs or does it really pound the GPU more ? In any case, it seems that the Cluster GPU seems to be the higher performance instance. What should I prefer ?

• EC2 for video-encoding

  3 mars 2022, par Naftuli Kay

  I have a potential job which will require me to do some video encoding with FFMPEG and x264. I'll have a series of files which I'll need to encode once, then I'll be able to bring down the instances. Since I'm not really sure of the resource utilization of x264 and FFMPEG, what kind of instances should I get ? I'm thinking either a

  



  


  High-CPU Extra Large Instance

  
 


  7 GB of memory
  
 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
  
 1690 GB of instance storage
  
 64-bit platform
  
 I/O Performance : High
  
 API name : c1.xlarge

  


  



  or, alternatively a

  



  


  Cluster GPU Quadruple Extra Large Instance

  
 


  22 GB of memory
  
 33.5 EC2 Compute Units (2 x Intel Xeon X5570, quad-core “Nehalem” architecture)
  
 2 x NVIDIA Tesla “Fermi” M2050 GPUs
  
 1690 GB of instance storage
  
 64-bit platform
  
 I/O Performance : Very High (10 Gigabit Ethernet)
  
 API name : cg1.4xlarge

  


  



  What should I use ? Does x264/FFMPEG perform better with faster/more CPUs or does it really pound the GPU more ? In any case, it seems that the Cluster GPU seems to be the higher performance instance. What should I prefer ?