Files of What Formats Can Be Transcoded?

File format

Input file format

MP4, TS, MOV, FLV, MPG, MXF, WMV, ADTS, AVI, MKV, MPEG, GIF, and WAV

Output file format

DASH, HLS, and MP4

Video codec

Input file encoding format

H.264, H.265, MPEG-2, MPEG-4, MJPEG, VP6/7/8/9, WMV1/2/3, and ProRes 422

Output file encoding format

H.264 and H.265

Video resolution

Common video resolutions

4096 x 2160, 3840 x 2160, 2560 x 1600, 2048 x 1536, 2560 x 1440, 2048 x 1152, 2048 x 1080, 1920 x 1080, 1440 x 1080, 1280 x 1080, 1280 x 720, 1280 x 544, 720 x 576, 854 x 480, and 720 x 480

Video bitrate

VBR (preferred)

Recommended average bitrates for different resolutions: over 80 Mbit/s for 4K (30 FPS), over 20 Mbit/s for 1080p, over 12 Mbit/s for 720p, and over 8 Mbit/s for 480p.

CBR

Recommended average bitrates for different resolutions: over 30 Mbit/s for 1080p, over 15 Mbit/s for 720p, and over 10 Mbit/s for 480p.

Video frame rate

Fixed frame rate

23.98/24, 25, and 29.97/30. The frame rate cannot be changed and must be greater than 5 FPS.

Other video requirements

Adaptive I frame

It is recommended that the maximum I frame interval be less than 10s. Fixed I frame intervals are supported.

B frame

It is recommended that the maximum number of consecutive B frames be less than 6.

Reference frames

It is recommended that the number of reference frames be less than 5.

Interleaving encoding

You are advised to provide progressive source video. Only 2:3 pull-down is supported.

Audio

Input audio file encoding format

AAC, AC3, EAC3, HE-AAC, MP2, MP3, PCM (s161e, s16be, s241e, s24be, DVD), and WMA

Output audio file format

MP3, MP4, and ADTS

Audio sampling rate

22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz, or 96 kHz

Audio channel

• 5.1 surround sound, stereo, and mono are supported for mono audio track.
• Mono is supported for multiple audio tracks.

Subtitle

Subtitling

Embedded subtitles and independent subtitles (SRT)