| # //media/muxers |
| |
| This directory contains code for muxing mkv (webm) and mp4 files. |
| * https://en.wikipedia.org/wiki/Matroska |
| * https://en.wikipedia.org/wiki/WebM |
| * https://en.wikipedia.org/wiki/MP4_file_format |
| |
| Muxers are based off the `media::Muxer` interface. These muxers are |
| primarily used by MediaRecorder and ChromeOS video recording. |
| |
| Since audio and video streams often come from sources with different |
| clocks, timestamp alignment can be handled by `MuxerTimestampAdapter`. |
| More details on synchronization can be found in the |
| [Media Capture and Streams](https://www.w3.org/TR/mediacapture-streams/#introduction) |
| spec. |
| |
| Currently the following codecs are supported in each muxer: |
| * webm: VP8, VP9, AV1, H.264 for video plus Opus for audio. |
| * mkv: VP8, VP9, AV1, H.264, H.265 for video plus Opus for audio. |
| * mp4: VP9, AV1, H.264, H.265 for video and Opus, AAC for audio. |
| |
| Note: webm is a subset of mkv that technically only supports vp8, vp9, |
| and av1 codecs. |
