Output formats

Choose a standalone video or audio export and configure its encoding settings.

Each transcode creates one file from a Source. Set exactly one format.id, then provide the settings that apply to that format.

Supported formats

Container	Codec	Format ID	Guide
MP4	H.264	`mp4_h264`	MP4
MP4	H.265	`mp4_h265`	MP4
MP4	AV1	`mp4_av1`	MP4
WebM	VP9	`webm_vp9`	WebM
M4A	AAC audio	`m4a_aac`	Audio

For adaptive HLS delivery, create a video asset. For JPEG or WebP images and sprite sheets, create a Thumbnails request.

Video dimensions and frame rate

Omitting both width and height preserves the Source's displayed dimensions, rounded down to even pixels. Specify one dimension and omit the other, or use -2, to preserve the aspect ratio.

Explicit dimensions must be even integers from 2 through 7680. H.265 requires at least 16 pixels per dimension; AV1 requires at least 64.

framerate defaults to the Source rate and accepts 0.001 through 240 frames per second. Fractional rates are supported. The selected dimensions and rate must also fit an explicit codec level.

Quality and bitrate

Choose per-title optimization, a fixed crf, or a target video_bitrate. Omitted rate controls use the codec's default CRF.

Do not combine crf with video_bitrate. Per-title optimization cannot be combined with crf, video_bitrate, minrate, maxrate, or bufsize.

Audio and trimming

Video outputs include audio when the Source has it. Set disable_audio: true for video only. Select m4a_aac to export just the audio, including from a video Source.

seek selects the start in seconds; duration selects the requested length. Omit duration to use the remaining Source interval. Chunkify caps the interval at the Source end and aligns it to output frames or audio samples.

Audio-only output must retain at least 0.001 seconds after normalization. The response's format.seek and format.duration show the accepted interval.

Get started

The quickstart shows a complete request. Each format guide includes its request schema; unsupported settings and unknown properties are rejected.

# Output formats > Choose a standalone video or audio export and configure its encoding settings. Each transcode creates one file from a Source. Set exactly one `format.id`, then provide the settings that apply to that format. ## Supported formats | Container | Codec | Format ID | Guide | | --- | --- | --- | --- | | MP4 | H.264 | `mp4_h264` | [MP4](/docs/transcoding/formats/mp4) | | MP4 | H.265 | `mp4_h265` | [MP4](/docs/transcoding/formats/mp4) | | MP4 | AV1 | `mp4_av1` | [MP4](/docs/transcoding/formats/mp4) | | WebM | VP9 | `webm_vp9` | [WebM](/docs/transcoding/formats/webm) | | M4A | AAC audio | `m4a_aac` | [Audio](/docs/transcoding/formats/audio) | For adaptive HLS delivery, create a [video asset](/docs/video-streaming/quickstart). For JPEG or WebP images and sprite sheets, create a [Thumbnails request](/docs/api-reference/thumbnails/create-thumbnails). ## Video dimensions and frame rate Omitting both `width` and `height` preserves the Source's displayed dimensions, rounded down to even pixels. Specify one dimension and omit the other, or use `-2`, to preserve the aspect ratio. Explicit dimensions must be even integers from 2 through 7680. H.265 requires at least 16 pixels per dimension; AV1 requires at least 64. `framerate` defaults to the Source rate and accepts 0.001 through 240 frames per second. Fractional rates are supported. The selected dimensions and rate must also fit an explicit codec `level`. ## Quality and bitrate Choose [per-title optimization](/docs/transcoding/per-title), a fixed `crf`, or a target `video_bitrate`. Omitted rate controls use the codec's default CRF. Do not combine `crf` with `video_bitrate`. Per-title optimization cannot be combined with `crf`, `video_bitrate`, `minrate`, `maxrate`, or `bufsize`. ## Audio and trimming Video outputs include audio when the Source has it. Set `disable_audio: true` for video only. Select `m4a_aac` to export just the audio, including from a video Source. `seek` selects the start in seconds; `duration` selects the requested length. Omit `duration` to use the remaining Source interval. Chunkify caps the interval at the Source end and aligns it to output frames or audio samples. Audio-only output must retain at least 0.001 seconds after normalization. The response's `format.seek` and `format.duration` show the accepted interval. ## Get started The [quickstart](/docs/transcoding/quickstart) shows a complete request. Each format guide includes its request schema; unsupported settings and unknown properties are rejected.