Help Center/ Media Processing Center/ API Reference/ Transcoding APIs/ Creating a Transcoding Task

Updated on 2024-03-14 GMT+08:00

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Creating a Transcoding Task

Function

This API is used to create a transcoding task to transcode media files, and add watermarks and capture snapshots during transcoding. A transcoding template must be configured before video transcoding. Ensure that an input media file is stored in an OBS bucket in the same region as MPC and the permission for accessing the OBS bucket has been granted to MPC.

Calling Method

For details, see Calling APIs.

URI

POST /v1/{project_id}/transcodings

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain the project ID, see Obtaining a Project ID .

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	No	String	User token The token can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is the user token.
Authorization	No	String	Authentication information. This parameter is mandatory when AK/SK-based authentication is used.
X-Project_Id	No	String	Project ID. This parameter is mandatory when AK/SK-based authentication is used. It is same as the project ID in path parameters.
X-Sdk-Date	No	String	Time when the request is sent. This parameter is mandatory when AK/SK-based authentication is used.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
input	No	ObsObjInfo object	Storage location of an input file. This parameter is mandatory in scenarios where audio is not added.
output	Yes	ObsObjInfo object	Storage location of an output file
trans_template_id	No	Array of integers	Transcoding template ID. If the av_parameter parameter is not contained, this parameter must be carried and its value is an array. Each transcoding output corresponds to a transcoding template ID. A maximum of nine template IDs are supported. Only the following parameters in transcoding templates can be changed: Video bitrate, height, and width
av_parameters	No	Array of AvParameters objects	Transcoding parameter If both trans_template_id and this parameter are specified, this parameter is preferentially used for transcoding. If trans_template_id is not specified, this parameter is mandatory.
output_filenames	No	Array of strings	Name of an output file. Each transcoded file has a name that corresponds to the sequence of the transcoding template ID array. If this parameter is specified, the output object name is object/file_name. If this parameter is not specified, the output object name is object/xxx, where xxx is allocated by MPC.
user_data	No	String	Custom user data. You can call a query API or send a notification to transfer this field to users.
watermarks	No	Array of WatermarkRequest objects	Array of image watermarks. Up to 10 watermarks are supported.
thumbnail	No	Thumbnail object	Snapshot information NOTE: Snapshots are generated only when the transcoding template specified by trans_template_id or the output resolution specified by av_parameters is 1920 x 1080, 1280 x 720, 854 x 480, or 480 x 270.
priority	No	Integer	Task priority. Possible values: 9: high 6: medium (default)
subtitle	No	Subtitle object	Subtitle parameters
encryption	No	Encryption object	Encryption parameters
crop	No	Crop object	Number of seconds cropped from a video for which transcoding is performed on.
audio_track	No	AudioTrack object	Audio track parameters
multi_audio	No	MultiAudio object	Multi-language and multi-channel audio parameters
video_process	No	VideoProcess object	Video processing parameters
audio_process	No	AudioProcess object	Audio processing parameters

**Table 4** AvParameters
Parameter	Mandatory	Type	Description
video	No	VideoParameters object	Video parameters
audio	No	Audio object	Audio parameters
common	Yes	Common object	Common parameters

**Table 5** VideoParameters
Parameter	Mandatory	Type	Description
output_policy	No	String	Output policy: If output_policy is set to discard in video parameters and transcode in audio parameters, only audio is output. If output_policy is set to transcode in video parameters and to discard in audio parameters, only video is output. If output_policy is set to copy in video parameters, the original video is copied without codec. If output_policy is set to copy in audio parameters, the original audio is copied without codec. output_policy cannot be set to discard in video and audio parameters at the same time. If output_policy is set to transcode in video and video parameters at the same time, video and audio are output. The options are as follows: discard transcode copy
codec	No	Integer	Video codec. Possible values: 1: VIDEO_CODEC_H264 2: VIDEO_CODEC_H265
bitrate	No	Integer	Average output bitrate Its value is 0 or an integer ranging from 40 to 50,000. Unit: kbit/s If this parameter is set to 0, the average output bitrate is an adaptive value.
profile	No	Integer	Encoding profile. Possible values: 1: VIDEO_PROFILE_H264_BASE 2: VIDEO_PROFILE_H264_MAIN 3: VIDEO_PROFILE_H264_HIGH 4: VIDEO_PROFILE_H265_MAIN
level	No	Integer	Encoding level Options: 0: AUTO 1: VIDEO_LEVEL_1_0 2: VIDEO_LEVEL_1_1 3: VIDEO_LEVEL_1_2 4: VIDEO_LEVEL_1_3 5: VIDEO_LEVEL_2_0 6: VIDEO_LEVEL_2_1 7: VIDEO_LEVEL_2_2 8: VIDEO_LEVEL_3_0 9: VIDEO_LEVEL_3_1 10: VIDEO_LEVEL_3_2 11: VIDEO_LEVEL_4_0 12: VIDEO_LEVEL_4_1 13: VIDEO_LEVEL_4_2 14: VIDEO_LEVEL_5_0 15: VIDEO_LEVEL_5_1
preset	No	Integer	Encoding quality. Possible options: 1: VIDEO_PRESET_SPEED (fast encoding) 2: VIDEO_PRESET_NORMAL (common encoding), which is not recommended 3: VIDEO_PRESET_HIGHQUALITY (high-quality encoding) Default value: 1
max_iframes_interval	No	Integer	Maximum I-frame interval. The value ranges from 2 to 10. Default value: 5 Unit: second
bframes_count	No	Integer	Maximum B-frame interval The options are as follows: H264: The value ranges from 0 to 8 and defaults to 4. H.265: The value ranges from 0 to 8 and defaults to 7. Unit: frame
frame_rate	No	Integer	Frame rate. The value is 0 (adaptive) or ranges from 5 to 60. Unit: FPS NOTE: If the configured frame rate is not within the value range, the value is automatically changed to 0. If the configured frame rate is higher than the frame rate of the input file, the value is automatically changed to the frame rate of the input file.
width	No	Integer	Video width, in pixels H.264: The value is a multiple of 2 from 32 to 4,096. H.265: The value is a multiple of 2 from 320 to 4,096.
height	No	Integer	Video height, in pixels H.264: The value is a multiple of 2 from 32 to 2,880. H.265: The value is a multiple of 2 from 240 to 2,880.
black_cut	No	Integer	Whether to enable black bar removal. 0: disables black bar removal 1: enables black bar removal and low-complexity algorithms for videos longer than 5 minutes 2: enables black bar removal and high-complexity algorithms for videos no longer than 5 minutes

**Table 6** Audio
Parameter	Mandatory	Type	Description
output_policy	No	String	Output policy: If output_policy is set to discard in video parameters and transcode in audio parameters, only audio is output. If output_policy is set to transcode in video parameters and to discard in audio parameters, only video is output. If output_policy is set to copy in video parameters, the original video is copied without codec. If output_policy is set to copy in audio parameters, the original audio is copied without codec. output_policy cannot be set to discard in video and audio parameters at the same time. If output_policy is set to transcode in video and video parameters at the same time, video and audio are output. The options are as follows: discard transcode copy
codec	No	Integer	Audio codec Possible options are: 1: AAC 2: HEAAC1 3: HEAAC2 4: MP3
sample_rate	No	Integer	Audio sampling rate The options are as follows: 1: AUDIO_SAMPLE_AUTO 2: AUDIO_SAMPLE_22050 (22,050 Hz) 3: AUDIO_SAMPLE_32000 (32,000 Hz) 4: AUDIO_SAMPLE_44100 (44,100 Hz) 5: AUDIO_SAMPLE_48000 (48,000 Hz) 6: AUDIO_SAMPLE_96000 (96,000 Hz) NOTE: When the encoding format is MP3, the audio sampling ratio cannot be 6.
bitrate	No	Integer	Audio bitrate. The value is 0 or ranges from 8 to 1,000. Unit: kbit/s
channels	Yes	Integer	Number of audio channels Options: 1: AUDIO_CHANNELS_1 (mono) 2: AUDIO_CHANNELS_2 (stereo) 6: AUDIO_CHANNELS_5_1 (5.1 surround sound) When the media packaging format is audio (MP3), the number of audio channels cannot be set to 5.1.

**Table 7** Common
Parameter	Mandatory	Type	Description
PVC	No	Boolean	Whether to enable low-bitrate HD The options are as follows: false: disabled (This function is disabled by default.) true: enabled (The value 0 indicates that the function is disabled. Other positive integers and negative values indicate true.)
hls_interval	No	Integer	HLS segment duration. This parameter is used only when pack_type is set to 1 or 3. The value ranges from 2 to 10. Unit: second
dash_interval	No	Integer	DASH segment duration. This parameter is used only when pack_type is set to 2 or 3. The value ranges from 2 to 10. Unit: second
pack_type	Yes	Integer	Packaging type Possible options are: 1: HLS 2: DASH 3: HLS+DASH 4: MP4 5: MP3 6: ADTS NOTE: If pack_type is set to 5 or 6, do not configure video parameters.

**Table 8** WatermarkRequest
Parameter	Mandatory	Type	Description
input	No	ObsObjInfo object	Storage location of an input file. This parameter is mandatory if an image watermark is used.
template_id	No	String	ID of a watermark template. You can call an API to create a watermark template.
text_context	No	String	Base64-coded text watermark. This parameter must be configured when type is set to Text. For example, if the text watermark to be added is "Test Text Watermark", the value of content is 5rWL6K+V5paH5a2X5rC05Y2w.
image_watermark	No	ImageWatermark object	Watermark parameters used for overwriting the parameters with the same names in the watermark template
text_watermark	No	TextWatermark object	Text watermark configurations. If text_context is set, this field cannot be left blank.

**Table 9** ImageWatermark
Parameter	Mandatory	Type	Description
dx	No	String	Horizontal offset between the start point of the watermark and the vertex of the output video Possible options are: Integer: horizontal offset between the watermark start point and the video vertex, in pixels. Value range: [0, 4096] Decimal: horizontal offset ratio of the watermark start point to the video width. The value range is (0, 1). Up to four decimal places are displayed, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated. For example, if the output video width is 1920 pixels, dx is set to 0.1, and referpos is set to TopRight, the horizontal offset between the upper right corner of the watermark and the right vertex of the video is 192.
dy	No	String	Vertical offset between the start point of the watermark and the vertex of the output video Possible options are: Integer: vertical offset between the watermark start point and the video vertex, in pixels. The value range is [0, 4096]. Decimal: vertical offset ratio of the watermark start point to the video height. The value range is (0, 1). Up to four decimal places are displayed, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated. For example, if the output video height is 1080 pixels, dy is set to 0.1, and referpos is set to TopRight, the vertical offset between the upper right corner of the watermark and the right vertex of the video is 108.
referpos	No	String	Watermark position. Possible values: TopRight: upper right corner TopLeft: upper left corner BottomRight: lower right corner BottomLeft: lower left corner
timeline_start	No	String	Watermark start time, which is used together with timeline_duration. Its value is a digit. Unit: second
timeline_duration	No	String	Watermark duration, which is used together with timeline_start. The value ranges from number to ToEND. ToEND indicates that the watermark lasts until the end of the video. Default value: ToEND
image_process	No	String	Image watermark processing mode. This parameter is valid only when type is set to Image. The options are as follows: Original: Only simple scaling is performed. Grayed: Image graying is performed. Transparent: The transparency of the original transparent image is retained.
width	No	String	Watermark image width. The options are as follows: Integer: width of a watermark image, in pixels. The value ranges from 8 to 4,096. Decimal: ratio of the width to the width of the output video. The value range is (0, 1). Up to four decimal places are displayed, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated.
height	No	String	Watermark image height. The options are as follows: Integer: height of a watermark image, in pixels. The value ranges from 8 to 4,096. Decimal: ratio of the height to the height of the output video. The value is greater than 0 and less than 1, and can contain up to four decimal places, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated.
base	No	String	Video on which the watermark is overlaid. Possible values: input: The watermark is overlaid on the input file. After transcoding, the size of the output file is scaled based on the aspect ratio of images. output: The watermark is overlaid on the output file.

**Table 10** TextWatermark
Parameter	Mandatory	Type	Description
dx	No	String	Horizontal offset between the start point of the watermark and the vertex of the output video Possible options are: Integer: horizontal offset between the watermark start point and the video vertex, in pixels. Value range: [0, 4096] Decimal: horizontal offset ratio of the watermark start point to the video width. The value range is (0, 1). Up to four decimal places are displayed, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated. For example, if the output video width is 1920 pixels, dx is set to 0.1, and referpos is set to TopRight, the horizontal offset between the upper right corner of the watermark and the right vertex of the video is 192.
dy	No	String	Vertical offset between the start point of the watermark and the vertex of the output video Possible options are: Integer: vertical offset between the watermark start point and the video vertex, in pixels. The value range is [0, 4096]. Decimal: vertical offset ratio of the watermark start point to the video height. The value range is (0, 1). Up to four decimal places are displayed, for example, 0.9999. If the value contains more than four decimal places, the part behind the fourth decimal place is automatically truncated. For example, if the output video height is 1080 pixels, dy is set to 0.1, and referpos is set to TopRight, the vertical offset between the upper right corner of the watermark and the right vertex of the video is 108.
referpos	No	String	Watermark position. Possible values: TopRight: upper right corner TopLeft: upper left corner BottomRight: lower right corner BottomLeft: lower left corner
timeline_start	No	String	Watermark start time, which is used together with timeline_duration. Its value is a digit. Unit: second
timeline_duration	No	String	Watermark duration, which is used together with timeline_start. The value ranges from number to ToEND. ToEND indicates that the watermark lasts until the end of the video. Default value: ToEND
font_name	No	String	Font. Only fzyouh is supported.
font_size	No	Integer	Font size The value ranges from 4 to 120.
font_color	No	String	Font color. The options are as follows: black, blue, white, green, red, yellow, brown, gold, pink, orange, and purple
base	No	String	Video on which the watermark is overlaid. Possible values: input: The watermark is overlaid on the input file. After transcoding, the size of the output file is scaled based on the aspect ratio of images. output: The watermark is overlaid on the output file. Default value: input

**Table 11** Thumbnail
Parameter	Mandatory	Type	Description
tar	No	Integer	Whether to compress captured snapshots to a TAR package. Possible values: 0: Captured snapshots are compressed to a TAR package. 1: Captured snapshots are not compressed to a TAR package.
out	No	ObsObjInfo object	Storage location of snapshots. If this parameter is not set, snapshots are stored in the same location as the output file.
params	Yes	ThumbnailPara object	Snapshot parameters

**Table 12** ThumbnailPara
Parameter	Mandatory	Type	Description
type	No	String	Sampling type Possible options are: TIME: Snapshots are captured at certain intervals. DOTS: Snapshots are captured at specific time points. Select this type for single snapshot capture. Default value: TIME
time	No	Integer	Interval for capturing snapshots. Default value: 12 Unit: second
start_time	No	Integer	Start time for the sampling type set to TIME. This parameter is used together with time. Default value: 0 Unit: second NOTE: If the value of start_time exceeds the media file duration, frames are not extracted.
duration	No	Integer	Capture duration when the sampling type is set to TIME. This parameter is used together with time and start_time, indicating that the first snapshot is captured at the time specified by start_time and snapshots are captured at the interval specified by time until the duration specified by this parameter elapses. Value range: [Number, ToEND]. ToEND indicates that snapshot capturing lasts till the end of the video. Default value: ToEND Unit: second NOTE: 0 indicates that snapshot capturing lasts from start_time to the end of the video.
dots	No	Array of integers	Array of time points when a snapshot is captured For example, if you enter [1,3,5], the image frames at the first, third, and fifth seconds of the video are captured. Asynchronous snapshot capturing: A maximum of 10 time points are supported. Synchronous snapshot capturing: Only one time point is supported.
dots_ms	No	Array of integers	Time point array of snapshot at a specified time in synchronous snapshot mode, in milliseconds. For example, enter [1000] to capture the image frame at the 1000th ms position of the video. Only one time point is allowed.
output_filename	No	String	Snapshot file name If only one snapshot is captured (the sampling type is DOTS and only one time point is specified), the output file name is the specified snapshot file name. If multiple snapshots are captured (the sampling type is DOTS and multiple time points are specified or the sampling type is TIME), an output file name contains the specified snapshot file name followed by the time point, for example, output_filename_10.jpg. If you specify the snapshots to be compressed into a TAR package, the output file name is the TAR package name.
format	No	Integer	Snapshot file format. The value is: 1: JPG
width	No	Integer	Image width The options are as follows: [96,3840] 0: adaptive (the original aspect ratio is retained) Unit: pixel
height	No	Integer	Image height The options are as follows: [96,2160] 0: adaptive (the original aspect ratio is retained) Unit: pixel
max_length	No	Integer	The longest side of a snapshot. The width of the snapshot is scaled proportionally with the longest side and input video pixel. The value ranges from 240 to 3,840. Unit: pixel NOTE: This parameter is used together with width/height. If neither width nor height is 0, the image size is calculated based on width/height. Otherwise, the image size is calculated based on max_length. If this parameter and width/height are not selected, snapshots are output based on the aspect ratio of the source media file.

**Table 13** Subtitle
Parameter	Mandatory	Type	Description
input	No	ObsObjInfo object	Storage location of an SRT file
inputs	No	Array of MulInputFileInfo objects	Storage location of SRT files
subtitle_type	No	Integer	Subtitle file type. Possible values: 0: No subtitle file is generated. 1: An external subtitle file is inserted into the video stream. 2: A WebVTT subtitle file is generated.

**Table 14** MulInputFileInfo
Parameter	Mandatory	Type	Description
language	No	String	Subtitle language tag. The ISO 639-2 encoding format (https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes) is recommended.
input	No	ObsObjInfo object	Storage location of a subtitle file

**Table 15** Encryption
Parameter	Mandatory	Type	Description
hls_encrypt	No	HlsEncrypt object	Encryption parameters for HLS videos

**Table 16** HlsEncrypt
Parameter	Mandatory	Type	Description
key	Yes	String	Base64-encoded content encryption key
url	Yes	String	The key carries the service address, and can be decrypted to play HLS segments.
iv	No	String	Initial vector, which is a random number in base64Binary format
algorithm	No	String	Encryption algorithm. Possible values: AES-128-CTR AES-128-CBC Default value: AES-128-CTR

**Table 17** Crop
Parameter	Mandatory	Type	Description
duration	No	Integer	Duration of a captured video, starting from 0 seconds. Unit: second

**Table 18** AudioTrack
Parameter	Mandatory	Type	Description
type	No	Integer	Audio track selection method. Possible values: 0: selected by default 1: selected manually
left	No	Integer	ID of the audio track where the left audio channel is
right	No	Integer	ID of the audio track where the right audio channel is

**Table 19** MultiAudio
Parameter	Mandatory	Type	Description
tracks_info	No	Array of TracksInfo objects	Audio track information
audio_files	No	Array of AudioFile objects	Parameters about a single audio file
default_language	No	String	Default language tag. The ISO 639-2 encoding format (https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes) is recommended.

**Table 20** AudioFile
Parameter	Mandatory	Type	Description
tracks_info	No	Array of TracksInfo objects	Audio track information
input	No	ObsObjInfo object	Storage location of an input file

**Table 21** TracksInfo
Parameter	Mandatory	Type	Description
channel_layout	No	String	Audio channel layout of the audio track
language	No	String	Audio language tag. The ISO 639-2 encoding format (https://en.wikipedia.org/wiki/List_of_ISO_639-2_codes) is recommended.

**Table 22** ObsObjInfo
Parameter	Mandatory	Type	Description
bucket	Yes	String	OBS bucket name
location	Yes	String	Region where an OBS bucket is located. It must be the same as the region where MPC is deployed.
object	Yes	String	OBS object path, which complies with the OSS Object definition. If this parameter is used for an input, an object must be specified. If this parameter is used for an output, only the directory for storing the output needs to be specified.
file_name	No	String	File name If this parameter is specified, the output object name is object/file_name. If this parameter is not specified, the output object name is object/xxx, where xxx is specified by MPC. When it is used as the output file name: Specifies the name of the output file. This parameter is valid for packaging. If the output file name needs to be specified during transcoding, use the output_filenames parameter. This parameter is valid for parsing. If a file name is specified during parsing, the parsing parameters are written to the specified file name and the file metadata is obtained through the query API response in JSON format. This parameter is invalid for snapshot capturing. This parameter is invalid for conversion into animated GIFs.

**Table 23** VideoProcess
Parameter	Mandatory	Type	Description
hls_init_count	No	Integer	Number of HLS start segments The value ranges from 0 to 10 and defaults to 0. NOTE: This parameter is used together with hls_init_interval to specify the duration of the first hls_init_count HLS segments. The value 0 indicates that there are no HLS start segments.
hls_init_interval	No	Integer	Duration of the first hls_init_count HLS segments The value ranges from 2 to 10 and defaults to 5. NOTE: This parameter is valid only when the value of hls_init_count is not 0.
hls_storage_type	No	String	HLS media streams storage composite: stored in the same file separate: stored in different files
rotate	No	Integer	Clockwise rotation angle of a video. Possible values: 0: Do not rotate. 1: Rotate a video by 90 degrees clockwise. 2: Rotate a video by 180 degrees clockwise. 3: Rotate a video by 270 degrees clockwise.
adaptation	No	String	Adaptive resolution. Possible values: SHORT: adaptive width LONG: adaptive height NONE: non-adaptive
upsample	No	Integer	Whether to enable upsampling, for example, converting a 480p video to a 720p one. Possible values: 0: disabled 1: enabled
hls_segment_type	No	String	HLS slice type. mpegts: TS slice fmp4: fMP4 slice The default value is ts.

**Table 24** AudioProcess
Parameter	Mandatory	Type	Description
volume	No	String	Adjusts volume. The options are as follows: auto: The volume is automatically adjusted. dynamic: The volume is manually adjusted. You need to set the allowed adjustment range. original: The volume is not adjusted.
volume_expr	No	Integer	Volume adjustment amplitude. This parameter is used only when volume is set to dynamic. The value ranges from –15 to 15. Unit: dB

Response Parameters

Status code: 202

**Table 25** Response body parameters
Parameter	Type	Description
task_id	Integer	Task ID. If the returned status code is 200 OK, the value is the task ID generated after the task is accepted.

Status code: 403

**Table 26** Response body parameters
Parameter	Type	Description
error_code	String	Error code
error_msg	String	Error description

Example Requests

Creates a video transcoding task.

POST https://{endpoint}/v1/{project_id}/transcodings

{
  "input" : {
    "bucket" : "example-bucket",
    "location" : "region01",
    "object" : "example-path/input.mp4"
  },
  "output" : {
    "bucket" : "example-bucket",
    "location" : "region01",
    "object" : "example-path/output"
  },
  "trans_template_id" : [ 1002, 1003, 1004, 1005 ],
  "priority" : "9",
  "subtitle" : {
    "subtitle_type" : 1,
    "input" : {
      "bucket" : "example-bucket",
      "location" : "region01",
      "object" : "example-subtitle.srt"
    }
  },
  "encryption" : {
    "hls_encrypt" : {
      "iv" : "******",
      "key" : "******",
      "url" : "http://{your-keyserver}",
      "algorithm" : "AES-128-CBC"
    }
  },
  "thumbnail" : {
    "out" : {
      "bucket" : "example-bucket",
      "location" : "region01",
      "object" : "example/path"
    },
    "tar" : 1,
    "params" : {
      "time" : 2,
      "format" : 1,
      "max_length" : 480
    }
  }
}

Example Responses

Status code: 202

Transcoding task created successfully.

{
  "task_id" : 100211
}

Status code: 403

Failed to create a transcoding task.

{
  "error_code" : "MPC.10202",
  "error_msg" : "Invalid request parameter"
}

Status Codes

Status Code	Description
202	Transcoding task created successfully.
403	Failed to create a transcoding task.

Error Codes

See Error Codes.

Parent Topic: Transcoding APIs

Previous topic: Transcoding APIs

Next topic: Canceling a Transcoding Task

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