Supported Transcoding Profiles

JetEncode treats a transcoding profile as supported only when validation accepts it and the integration suite can produce an artifact that matches the expected FFprobe/Shaka properties.

The release gate uses the production encoders with real FFmpeg and FFprobe. When Shaka Packager is installed, streaming validation also uses real Shaka.

Video container / codec contract

Codec/container combinations outside this table are rejected during validation rather than being passed optimistically to FFmpeg.

Audio codec contract inside video containers

copy is intentionally source-dependent: the source stream must already be legal for the destination container. The validation suite verifies copy using its known H.264/AAC fixture.

Standalone audio containers

Legacy tokens that do not have a supported destination profile (for example AMR-NB, WMA2, FLAC, or Theora in the current container inventory) are rejected. A token being understood by an old FFmpeg mapping is not a production support promise.

H.264 profiles and pixel formats

The following H.264 combinations are explicitly generated and FFprobed:

H.264 without an explicit profile also validates yuv422p and lets x264 select the matching profile automatically.

HEVC supports normal yuv420p and validated 10-bit yuv420p10le. vprofile and level are currently part of the supported H.264 contract only.

DNxHD

DNxHD is intentionally not advertised as an arbitrary codec/resolution combination. The supported profile is:

• MOV
• 1280×720
• 25 fps
• 90 Mbps
• yuv422p
• PCM S16LE audio

Other DNxHD combinations are rejected until they are explicitly validated.

Resolution profiles

Landscape H.264 validation runs every accepted preset and verifies the actual output dimensions with FFprobe:

144p, 240p, 360p, 480p, 540p, 576p, 720p, 1080p, 1440p, 2160p, 4k, plus custom WxH.

Portrait input is tested separately so preset scaling is verified to preserve orientation.

4k is explicitly parsed as a resolution, not as a 4k bitrate token.

Frame-rate profiles

0fps, 15fps, 23.98fps, 25fps, 29.97fps, 30fps, 60fps.

0fps means preserve the source frame rate. It must not emit FFmpeg -r 0.

Encoding options

The validation suite verifies real artifacts for:

• quality/CRF + maxrate on H.264, HEVC, VP8, and VP9
• H.264 profile and level
• supported H.264/HEVC pixel formats
• fragmented MP4 with a real moof atom
• H.264 two-pass
• HEVC two-pass
• watermark / transpose / flip / crop / trim operations

Two-pass is accepted only for H.264/HEVC, requires a video bitrate in the resolved output, and cannot be combined with quality/CRF mode.

Audio properties

Sample-rate validation covers 8000, 11025, 22050, 44100, and 48000 Hz.

Mono and stereo are asserted directly. multi is tested with a generated 5.1 source and must preserve six channels.

PCM codecs do not accept bitrate settings because that option is meaningless for these uncompressed profiles.

Image profiles

• JPEG
• PNG
• WebP
• GIF
• WebP with automatic height (400x)
• animated WebP scene extraction
• number / interval / offset thumbnails
• sprite generation and VTT output

Streaming profiles

The real integration suite verifies:

• video-only HTTP-stream variants
• audio-only variants
• mixed audio/video variants
• HLS packaging
• DASH + HLS fMP4 packaging
• AES-128 HLS post-encryption

Generated manifests and referenced files must exist and be non-empty. HLS media segments are probed with FFprobe.

Release commands

Media-only validation:

make test-transcoding

Full release gate with PostgreSQL available:

make test-release

There is deliberately no line-coverage requirement. The release criterion is that every advertised profile produces the expected media artifact and that the real job/infrastructure workflows pass.