What Formats Does Transcoding Support?
Table 1 lists available transcoding formats.
| Feature | Parameter | Description |
|---|---|---|
| File format | Input file format | MP4, TS, MOV, FLV, MPG, MXF, WMV, ADTS, AVI, MKV, MPEG, GIF, and WAV |
| Output file format | DASH, HLS, TS, and MP4 | |
| Video codec | Input file encoding format | H.264, H.265, MPEG-2, MPEG-4, MJPEG, WMV1/2/3, and Proress422 |
| Output file encoding format | H.264 and H.265 | |
| Video resolution | Common video resolutions | 4096x2160, 3840x2160, 2560x1600, 2048x1536, 2560x1440, 2048x1152, 2048x1080, 1920x1080, 1440x1080, 1280x1080, 1280x720, 1280x544, 720x576, 854x480, and 720x480 |
| Video bitrate | VBR (preferred) | It is recommended that the average bitrate for 4K (30fps) video be over 80 Mbit/s, 1,080p video over 20 Mbit/s, 720p video over 12 Mbit/s, and 480p video over 8 Mbit/s. |
| CBR | It is recommended that the bitrate for 1,080p video be about 30 Mbit/s, 720p video over 15 Mbit/s, and 480p video over 10 Mbit/s. | |
| Video frame rate | Fixed frame rate | 23.98/24, 25, and 29.97/30. The variable frame rate is not supported. |
| 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 frame | 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 |
| |
| Subtitle | Subtitling | Embedded subtitles and independent subtitles (SRT) |
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