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The FFmpeg base of the mediaio family: the one place that links
libavcodec and libavformat (through
ffmpeg-next) and the
crossings between FFmpeg's memory and the shared media vocabulary.
FFmpeg 9 is the floor, for this crate and every crate of the family
built on it: no older release is supported, and the build script refuses
one by name. It reads the linked release from ffmpeg-sys-next's links
metadata (DEP_FFMPEG_FFMPEG_9_0, set from libavcodec 63.1, FFmpeg 9.0's).
| here | not here |
|---|---|
the carriers (FfmpegBytes, FfmpegBuffer, the Owned / View lanes) and the operations that fill them |
the decoders and the demuxer — mediadecode-ffmpeg |
packet and frame conversion in both directions (boundary, convert) |
the push-style decoder sessions and their hardware probing |
CodecTicket, CodecId, ContainerFormat, SampleFormat, the channel-layout mapping |
|
the adapter type Ffmpeg and its adapter-trait impls |
|
DecoderLimits, DemuxLimits, FrameLimits, PacketLimits |
|
the FFmpeg resampler (feature resample) |
|
| the allocator judge's callbacks and their shared state |
The crossing's safety model
Every operation whose soundness rests on something only its caller can
establish — a raw pointer's liveness, an extent, a claim about who else
can write a buffer, a geometry a frame must keep, that every byte an
object exports was written — is an unsafe fn with a # Safety section
saying what the caller proves, against the sections of
mediaio_ffmpeg::contracts. That includes every conversion from an
ffmpeg_next frame, packet or subtitle: ffmpeg_next's safe API builds
ones whose bytes were never written (frame::Video::new, Packet::new),
so no safe function here reads their storage. The machines in
mediadecode-ffmpeg call them with their proofs written beside each
call. What a consumer holds — a packet, a frame, a carrier — is safe to
use without any of that.
Features
| feature | default | what it adds |
|---|---|---|
std |
yes | the vocabulary's std tier |
resample |
yes | FfmpegResampler over libswresample |
test-support |
no | the fault-subprocess harness, the FFmpeg allocation cap and the callback-state hooks, for the lanes of this crate and of crates built on it |
License
mediaio-ffmpeg is under the terms of both the MIT license and the
Apache License (Version 2.0).
See LICENSE-APACHE, LICENSE-MIT for details.
Copyright (c) 2026 FinDIT Studio authors.