I'm developing a video streaming platform using MediaConvert to transcode uploaded videos from S3. Currently, I have a Lambda function that gets triggered whenever a new video is added to the bucket, which then starts the transcoding process. However, the issue arises when MediaConvert outputs a folder containing multiple files; I want to trigger another Lambda function only after all five files are completely uploaded to the output S3 bucket. Is there a way to achieve this? Thanks!
3 Answers
Consider using AWS Step Functions to create a workflow that can manage the whole process. It can check if all required files are uploaded and only proceed once they're confirmed to be present.
You should take a look at the MediaConvert complete event feature. It sends a notification when the transcoding is done along with the details of all the output files. This way, your Lambda can be triggered seamlessly to process those files after they're all ready.
S3 actually uses prefixes instead of traditional folders. If you know you're always getting five files, you could check the output by using the `listObjectsV2` API to count how many files are there. When you find all five, that's when you can trigger your next Lambda function.
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