Transcoding template parameters-Intelligent Media Services(IMS)-阿里云帮助中心

Parameter	Data type	Required	Description	Example
Type	string	Yes	The type of the transcoding template. Valid values: Normal: normal transcoding template AudioTranscode: audio transcoding template Remux: container format conversion template NarrowBandV1: Narrowband HD 1.0 template NarrowBandV2: Narrowband HD 2.0 template	Normal
Container	JSON	Yes	The container format.	{"Format" : "mp4"}
Video	JSON	No	The parameters of the output video.	{"Codec" : "H.264", "Maxrate" : 900, "Rotate" : "auto", "Preset" : "medium", "PixFmt" : "yuv420p", "Width" : 640, "Bitrate" : 400 }
Audio	JSON	No	The parameters of the output audio.	{ "Codec" : "aac", "Bitrate" : 64, "Samplerate" : 44100, "Channels" : 2 }
MuxConfig	JSON	No	The container segment.	{ "Segment": { "Duration" : 5, "ForceSegTime" : "2,3" }}

Container

Parameter	Data type	Required	Description	Example
Format	String	Yes	The container format. Valid values: mp4, m3u8, flv, ts, hls-fmp4, mpd, mxf, mp3, ogg, flac, m4a, gif, and webp.	mp4

Video

Parameter	Data type	Required	Description	Example
Codec	string	No	The encoding format. Valid values: H.264, H.265, GIF, WEBP, AV1, and AVC-Intra.	H.264
Profile	string	No	The encoding profile. Default value: high. Valid values: baseline: applicable to mobile devices. main: applicable to standard-definition devices. high: applicable to high-definition devices.	main
Bitrate	integer	No	The average bitrate of the video. Valid values: [10,50000]. Unit: Kbit/s.	3000
Crf	integer	No	The constant rate factor. Valid values: [0,51]. If you specify this parameter, the value of Bitrate is invalid. Default value: 23: This value is used as the default value when the Codec parameter is set to H.264. 26: This value is used as the default value when the Codec parameter is set to H.265.	23
Width	integer	No	The width of the output video. Valid values: [128,4096]. Unit: pixels. Default value: the width of the input video.	1920
Height	integer	No	The height of the output video. Valid values: [128,4096]. Unit: pixels. Default value: the height of the input video.	1080
Fps	integer	No	The video frame rate. Valid values: (0,60]. The value is 60 if the frame rate of the input file exceeds 60. Default value: the frame rate of the input video.	25
Gop	integer	No	The maximum number of frames between two keyframes. Valid values: [1,1080000]. Default value: 250.	250
Preset	string	No	The preset video algorithm. This parameter is valid only if the Codec parameter is set to H.264. Valid values: veryfast, fast, medium, slow, and slower. Default value: medium.	medium
ScanMode	string	No	The scan mode. Valid values: interlaced and progressive.	progressive
PixFmt	string	No	The pixel format. Valid values: yuv420p, yuvj420p, yuv422p, yuvj422p, yuv444p, yuvj444p, nv12, nv16, nv20, yuv420p10, yuv422p10, and yuv444p10.	yuv420p
Remove	boolean	No	Specifies whether to remove the video. Valid values: true false	false
Crop	string	No	The crop mode. Two modes are supported: border: If you set this parameter to border, black bars are automatically detected and removed. Custom cropping: To use this mode, you must configure the parameter in the `width:height:left:top` format. Example: `1280:800:0:140`.	1280:800:0:140
Pad	string	No	The information about the black bars. Parameter format: `width:height:left:top`. Example: `1280:800:0:140`.	1280:800:0:140
LongShortMode	boolean	No	Specifies whether to enable the auto-rotate screen feature.	false
Bufsize	integer	No	The buffer size. Valid values: [1000,128000]. Default value: 6000. Unit: Kbit/s.	6000
Maxrate	integer	No	The maximum bitrate of the video. Valid values: [10,50000]. Unit: Kbit/s.	9000
AbrMax	string	No	The maximum adaptive bitrate (ABR). This parameter is valid only when the Type parameter is set to NarrowBandV1. Valid values: [10,50000]. Unit: Kbit/s.	6000

Audio

Parameter	Data type	Required	Description	Example
Codec	string	No	The audio encoding and decoding format. Valid values: AAC, MP3, VORBIS, and FLAC. Default value: AAC. Note When the container format is m3u8 and the video codec is H.265, AAC is a valid audio codec.	AAC
Profile	string	No	The audio encoding profile. If the Codec parameter is set to AAC, you can set this parameter to aac_low, aac_he, aac_he_v2, aac_ld, or aac_eld.	aac_low
Samplerate	integer	No	The sampling rate. Default value: 44100. Valid values: 22050, 32000, 44100, 48000, and 96000. Unit: Hz.	44100
Bitrate	integer	No	The audio bitrate of the output file. Valid values: [8,1000]. Unit: Kbit/s. Default value: 128.	128
Channels	integer	No	The number of sound channels. Default value: 2.	2
Remove	boolean	No	Specifies whether to delete the audio stream. Valid values: Valid values: true false	false
Volume	JSON	No	The volume control configurations.	For more information, see Audio.Volume.

Audio.Volume

Parameter	Data type	Required	Description	Example
Method	string	No	The volume adjustment method. Valid values: auto dynamic linear	auto
IntegratedLoudnessTarget	integer	No	The output volume.	-6
TruePeak	integer	No	The maximum volume.	-1
LoudnessRangeTarget	integer	No	The range of the volume relative to the output volume. It takes effect when Method is set to dynamic. Unit: db. Valid values: 1 to 20. Default value: 8.	8

MuxConfig

Parameter	Data type	Required	Description	Example
Segment	JSON	Yes	The segment parameters.	For more information, see MuxConfig.Segment.

MuxConfig.Segment

Parameter	Data type	Required	Description	Example
Duration	integer	Yes	The segment length. Unit: seconds.	10
ForceSegTime	string	No	The time point at which a forced segment is generated.	2,3

Sample template

{
  "Type": "Normal",
  "Container": {
    "Format": "mp4"
  },
  "Video": {
    "Codec": "H.264",
    "LongShortMode": false,
    "Height": 2160,
    "Remove": false,
    "Profile": "high"
  },
  "Audio": {
    "Codec": "AAC",
    "Volume": {
      "Method": "auto"
    },
    "Remove": false,
    "Samplerate": 44100,
    "Bitrate": 128,
    "Channels": 2
  }
}