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Implement custom stream IO #251

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Implement custom stream IO #251

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@AdrianEddy AdrianEddy commented Oct 23, 2025 •
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This PR adds a way to create inputs and outputs by providing a standard Rust Read/Write/Seek streams.

It allows using ffmpeg with arbitrary data sources like filesystem, network, memory etc

examples:

let file = std::fs::File::open("test.mp4")?;
let input_ctx = format::input_from_stream(format::context::StreamIo::from_read_seek(file)?, None, None)?;
let mut vec = Vec::new();
let mut cursor = std::io::Cursor::new(&mut vec);
let mut output_ctx = format::output_to_stream(format::context::StreamIo::from_read_write_seek(cursor)?, None, Some("mp4")).unwrap();

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