FFmpeg Format Conversion

To convert MP4 to MKV using FFmpeg, remux the media container without re-encoding by stream copying the video and audio tracks. This swaps the container format directly, enabling flexible playback and archival workflows without altering the underlying codecs.

The best way to transcode video to H.265 is by re-encoding the stream with FFmpeg while applying Constant Rate Factor (CRF) and bitrate controls. This balances output quality and performance, significantly reducing file sizes for storage optimization.

You can copy audio streams without re-encoding during container conversion by utilizing FFmpeg's stream copy mode. This selectively extracts and transfers tracks like AAC or MP3 directly into the new container, preserving original quality and saving processing time.

FFmpeg supports converting AVI files to modern codecs like AV1 and VP9 through full re-encoding. This allows you to transcode older video formats into highly compressed, contemporary codecs for improved playback compatibility and archival efficiency.

Use two-pass encoding instead of stream copy when you need strict output file size control and optimal quality distribution. Stream copy is faster but limits container compatibility, whereas two-pass re-encoding calculates bitrate precisely for complex video transcoding.