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• Trouble with Cross-Origin Headers : Stripe and ffmpeg Integration in Next.js

  7 février 2024, par Duke

  I'm using this excellent template from vercel as a base for my project :

  


  https://vercel.com/templates/next.js/subscription-starter


  


  I've used it for many projects and the Stripe integration works flawlessly. However for a new project I needed to incorporate ffmpeg which relies on SharedArrayBuffer :

  


  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer


  


  So I need to set the appropriate HTTP response header which i've set in my next.config.js file as below :

  


        {
        source: '/(.*)',
        headers: [
          {
            key: 'Cross-Origin-Embedder-Policy',
            value: 'credentialless'
            // value: 'require-corp'
          },
          {
            key: 'Cross-Origin-Opener-Policy',
            value: 'same-origin-allow-popups'
          }
        ]
      }


  


  Now the issue is that settings these breaks Stripe. It blocks the request :

  


  https://js.stripe.com/v3/m-outer-3437aaddcdf6922d623e172c2d6f9278.html


  


  Which appearently loads more resources that are needed for the checkout session to function. The customer portal works but checkout doesn't. I've literally tired every possible permutation of headers with different values but in all cases either Stripe works but ffmepg doesn't (cause SharedArrayBuffer doesn't work) or vice versa. It's been a week and I've tired everything and can't find anything online that works. Not even ChatGPT can help which ironcelly asks me to contact Stripe customer support. I would highly appreciate if anyone could even point me in the right direction. I Thank you in advance good Sir/Maam.

  


  Note that Checkout works fine with just :

  


  key: 'Cross-Origin-Opener-Policy',
value: 'same-origin'


  


  Just Cross-Origin-Embedder-Policy breaks it

  


• Rotate video according to rotation metadata and strip off metadata using ffmpeg [on hold]

  12 décembre 2018, par this.lau_

  I’ve got a video with the following metadata :

  Metadata:
  
    rotate          : 90
  
    creation_time   : 2018-12-03T16:13:47.000000Z
  
    handler_name    : VideoHandle
  
  Side data:
  
    displaymatrix: rotation of -90.00 degrees

  And I would like to remove this metadata and rotate the video by whatever rotation value is found there (in this case -90 but it can be anything).

  The result will be a video with the correct orientation and that works with all video players (including those that don’t auto-rotate based on the metadata).

  I’ve tried various commands but couldn’t find anything that would work. Any idea how to do this ?

• ffmpeg : two videos side-by-side with audio1 lang=ger & audio2 lang=eng

  19 janvier 2023, par miridigital

  I have two videos from two GoPro cameras. Both videos are rendered via ffmpeg side-by-side into a single video (left and right) and the audio is currently combined/mixed into two channels (stereo). I can hear both camera audio channels at the same time.

  


  Two channels stereo :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -ac 2 side-by-side.mp4


  


  audio from both videos mixed into a single file with 2 channels - mediainfo

  


  Now I want to switch between the two audio channels (cam1 or cam2) while I'm playing the side-by-side video.

  


  My first try : With four channels (without -ac 2 parameter) :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" side-by-side.mp4


  


  audio from both videos mixed into a single file with 4 channels - mediainfo

  


  But the most video players can't easily select the channels 1+2 or 3+4 while playing.

  


  So I tried two languages :

  


  ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[v]; [0:a][1:a]amerge[a]" -map "[v]" -map "[a]" -metadata:s:a:0 language=ger -metadata:s:a:1 language=eng side-by-side.mp4


  


  audio from both videos mixed into a single file with 4 channels with languages - mediainfo

  


  But that's wrong. I can only see german with 4 channels. How can I put channels 1+2 into german and channels 3+4 into english ? Afterwards I should be able to use the multi language feature from most video players to switch the audio between cameras.

  


  Thank you,
  
Miriam