How conversion works · Comparison
Encoding vs Transcoding
Cameras encode once. Converters often transcode. Remuxers avoid both when they can copy packets into a new container.
Quick take: Encoding creates a bitstream from raw/decoded data. Transcoding specifically means decoding an already-encoded file and encoding again — usually to change codec, bitrate, or size.
Fresh encode
RAW/PCM/frames → compressed file. Maximum control over quality.
Transcode path
Existing MP3 → quieter AAC, or 4K H.264 → 1080p H.264. Starts from already-quantized data.
Key points
- Transcoding is encoding with a decoded compressed source.
- Each lossy transcode can cost quality.
- Prefer remux when only the container must change.
Encoding vs Transcoding
Encoding
- Raw or decoded input → bitstream
- Includes first exports from editors
- General term for “write compressed media”
Transcoding
- Already-encoded input → new bitstream
- Implies decode + encode
- Common in format converters
Only need MP4 instead of MKV
Pick: Remux (avoid transcode)
Keep the same codec packets when possible.
Need a smaller streaming bitrate
Pick: Transcode
Must re-encode at a new rate.
Examples
Encode
Export timeline from an NLE to H.264.
Transcode
Convert that H.264 file to VP9 for a WebM delivery.
Try it in a converter
Concepts stick better with a real file — processing stays in your browser.
Related concepts
FAQ
Is every Format Convertly job a transcode?
Many are. Some container swaps can be lighter. Image format changes almost always decode + encode.
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