有时无法使用 Cloudfront 流式传输 HLS MediaConvert 视频

Question

I converted my video into HLS format through AWS Media Convert. Now I am facing some issues and it is totally random.

Sometimes when I try to stream those HLS encrypted videos it gives a 404 not found error. However when I connect VPN and then try to access it then I am able to stream those videos.

Sometimes I am unable to stream those videos on mobile data but it works perfectly over Wifi.

Sometimes I am unable to stream videos but my friend who lives in a different city is able to stream it and sometimes my friend is not able to stream but I can.

I am facing these issues on mobile as well as on browser and these are totally random.

Let me know if you need further details from my side to fix the issue.

I am testing on browser and android app. For the browser, I used the plyr.js library.

Anyone has any idea what could be the issue. I really don't know what part of the code should I share here, let me know if anyone needs to see my code.

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Q. Can you please confirm if your transcode job on AWS Elemental MediaTailor runs successfully or do you see any errors ?

A. Yes it is completed successfully

Q. Is the 404 seen for the same output file ?

A. Yes.

Q. Do you use any CDN to deliver your output files or do you stream from S3 directly ? If you use a CDN, can you ensure that there's no GeoBlocking on your configuration which may prevent you from accessing the content from a specific region.

A. I use Cloudfront. And I don't this there is and geo restriction because it sometimes works and sometime don't.

Q. If you stream from S3 directly, are your objects and buckets marked public to allow your files to be accessed by other users ?

A. Can not steam directly from S3 as bucket policy allow access through only CloudFront.

Answer 1

HTTP status code 404 is usually sent out when a resource is missing.
This can happen in multiple scenarios. For example, the transcode job has not completed yet ie, the object doesn't exist or the URL you're trying to request for is wrong. From your description it looks like the issue is intermittent which may mean that you're trying to access the file before it has transcoded successfully. However it is still unclear whether you get 404 response for the same file or different files. Can you please describe your issue in more detail. Ideally I would need the following information :

1. Can you please confirm if your transcode job on AWS Elemental MediaTailor runs successfully or do you see any errors ?
2. Is the 404 seen for the same output file ?
3. Do you use any CDN to deliver your output files or do you stream from S3 directly ? If you use a CDN, can you ensure that there's no GeoBlocking on your configuration which may prevent you from accessing the content from a specific region.
4. If you stream from S3 directly, are your objects and buckets marked public to allow your files to be accessed by other users ?

We have instructions on how to setup cloudwatch events to monitor your transcode jobs in our guide[1] but please keep in mind you maybe charged for setting up these events.

====Documentation=====

[1] https://docs.aws.amazon.com/mediaconvert/latest/ug/cloudwatch_events.html