John Davidson

Message:

I have:

1. S3 INPUT bucket


2. S3 OUTPUT bucket


3. PHP


4. ffmpeg

Is it possible to read file directly from INPUT bucket → Transcode to another format → Save into OUTPUT bucket.

Please let me know manuals, libraries, frameworks, any stuff that helps to understand how to do it.

At least python realisations also welcome. At least at least some different language also OK.

Input file size may be more than 10Gb so writing whole file in RAM is undesirable. Some chunk-based way is preferable.

Output format is mostly .mp4, but input format may be ts video or image (jpg, gif, etc)

Looks like PHP-FFmpeg-video-streaming fit to my task, but it can work only with web streaming formats.

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My Answer:
Yes, it is possible to transcode video directly between S3 buckets using PHP, ffmpeg, and the AWS SDK for PHP. Here is a general outline of how you can achieve this:

1. Use the AWS SDK for PHP to access the S3 buckets and retrieve the input file from the INPUT bucket in chunks. You can use the `getObject` method to download the file in chunks rather than loading the entire file into memory.

2. Use ffmpeg to transcode the input file to the desired output format. You can use the `exec` function in PHP to run ffmpeg commands. Make sure to specify the input and output file paths as S3 URLs.

3. Once the transcoding is complete, use the AWS SDK for PHP to upload the transcoded file to the OUTPUT bucket in chunks using the `putObject` method.

Here are some resources that may help you with this task:

- AWS SDK for PHP documentation: https://docs.aws.amazon.com/sdk-for-php/v3/api/
- FFMPEG documentation: https://ffmpeg.org/documentation.html
- PHP `exec` function documentation: https://www.php.net/manual/en/function.exec.php

You can also look into using the AWS Elastic Transcoder service, which is a managed media transcoding service that can transcode media files stored in S3 buckets. This may be a more efficient and scalable solution for transcoding large video files.