您可以从使用 ffprobe 切换到 MediaInfo [1]。这可以获得输入文件的持续时间和文件大小。从那里您可以使用文章中的计算并使用 MediaConvert 创建您的精灵图像。作业完成后,您可以使用 COMPLETE CloudWatch Event 触发可以创建精灵清单的后处理工作流。默认情况下,COMPLETE 详细信息部分将包括从您的 MediaConvert 输出 [2] 到最后一个 JPEG 帧捕获的输出路径。
作为预处理步骤,您可以收集文件的持续时间以及大小。如果您只需要文件的大小,那么您可以使用 S3 SDK 获取文件的内容长度(调用 HEAD 到对象)并从那里计算。
s3 = boto3.client('s3')
response = s3.head_object(Bucket='bucket', Key='keyname')
size = response['ContentLength']
print(size)
您还可以在作业模板中使用参数覆盖。例如,您可以创建一个引用模板的作业,但您可以通过调用 CreateJob API 来指定覆盖这些设置的设置。
以下是预设,但同样的概念适用于作业模板。
使用以下 HLS 系统预设
System-Avc_16x9_720p_29_97fps_3500kbps
System-Avc_16x9_360p_29_97fps_1200kbps
System-Avc_16x9_270p_14_99fps_400kbps
JSON Payload 更改了输出 2 (System-Avc_16x9_360p_29_97fps_1200kbps) 和输出 3 (System-Avc_16x9_270p_14_99fps_400kbps) 的音频选择器源名称
{
"Queue": "arn:aws:mediaconvert:us-west-2:111122223333:queues/Default",
"UserMetadata": {},
"Role": "arn:aws:iam::111122223333:role/EMFRoleSPNames",
"Settings": {
"OutputGroups": [
{
"Name": "Apple HLS",
"Outputs": [
{
"NameModifier": "_1",
"Preset": "System-Avc_16x9_720p_29_97fps_3500kbps"
},
{
"NameModifier": "_2",
"Preset": "System-Avc_16x9_360p_29_97fps_1200kbps",
"AudioDescriptions": [
{
"AudioSourceName": "Audio Selector 2"
}
]
},
{
"NameModifier": "_3",
"Preset": "System-Avc_16x9_270p_14_99fps_400kbps",
"AudioDescriptions": [
{
"AudioSourceName": "Audio Selector 2"
}
]
}
],
"OutputGroupSettings": {
"Type": "HLS_GROUP_SETTINGS",
"HlsGroupSettings": {
"ManifestDurationFormat": "INTEGER",
"SegmentLength": 10,
"TimedMetadataId3Period": 10,
"CaptionLanguageSetting": "OMIT",
"Destination": "s3://myawsbucket/out/master",
"TimedMetadataId3Frame": "PRIV",
"CodecSpecification": "RFC_4281",
"OutputSelection": "MANIFESTS_AND_SEGMENTS",
"ProgramDateTimePeriod": 600,
"MinSegmentLength": 0,
"DirectoryStructure": "SINGLE_DIRECTORY",
"ProgramDateTime": "EXCLUDE",
"SegmentControl": "SEGMENTED_FILES",
"ManifestCompression": "NONE",
"ClientCache": "ENABLED",
"StreamInfResolution": "INCLUDE"
}
}
}
],
"Inputs": [
{
"AudioSelectors": {
"Audio Selector 1": {
"Offset": 0,
"DefaultSelection": "DEFAULT",
"ProgramSelection": 1,
"SelectorType": "TRACK",
"Tracks": [
1
]
},
"Audio Selector 2": {
"Offset": 0,
"DefaultSelection": "NOT_DEFAULT",
"ProgramSelection": 1,
"SelectorType": "TRACK",
"Tracks": [
2
]
}
},
"VideoSelector": {
"ColorSpace": "FOLLOW"
},
"FilterEnable": "AUTO",
"PsiControl": "USE_PSI",
"FilterStrength": 0,
"DeblockFilter": "DISABLED",
"DenoiseFilter": "DISABLED",
"TimecodeSource": "EMBEDDED",
"FileInput": "s3://myawsbucket/input/test.mp4"
}
],
"TimecodeConfig": {
"Source": "EMBEDDED"
}
}
}
== 资源 ==
[1] https://aws.amazon.com/blogs/media/running-mediainfo-as-an-aws-lambda-function/
[2] https://docs.aws.amazon.com/mediaconvert/latest/ ug/file-group-with-frame-capture-output.html