当使用python使用putMedia api时，我得到了以下响应。
响应代码：200
{"Output"：{"__type"："com.amazon.coral.service#SerializationException"，"Message"：null}，"Version"："1.0"}
我已经在本地保存了视频帧，并尝试在亚马逊视频流上发布第一帧。我已使用使用签名版本 4 对 AWS 请求进行签名说明进行签名。
下面是我的代码 -
import sys, os, base64, datetime, hashlib, hmac, time
import requests # pip install requests
# ************* REQUEST VALUES *************
method = 'POST'
service = 'kinesisvideo'
host = 's-1110bf70.kinesisvideo.us-west-2.amazonaws.com'
region = 'us-west-2'
endpoint = 'https://s-1110bf70.kinesisvideo.us-west-2.amazonaws.com'
# POST requests use a content type header. For DynamoDB,
# the content is JSON.
content_type = 'application/json'
start_tmstp = repr(time.time())
localfile = 'mkv-0.jpg';
with open(localfile,'rb') as image:
request_parameters = image.read()
# Key derivation functions. See:
# http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-python
def sign(key, msg):
return hmac.new(key, msg.encode("utf-8"), hashlib.sha256).digest()
def getSignatureKey(key, date_stamp, regionName, serviceName):
kDate = sign(('AWS4' + key).encode('utf-8'), date_stamp)
kRegion = sign(kDate, regionName)
kService = sign(kRegion, serviceName)
kSigning = sign(kService, 'aws4_request')
return kSigning
# Read AWS access key from env. variables or configuration file. Best practice is NOT
# to embed credentials in code.
access_key = '***********'
secret_key = '*************'
if access_key is None or secret_key is None:
print('No access key is available.')
sys.exit()
# Create a date for headers and the credential string
t = datetime.datetime.utcnow()
amz_date = t.strftime('%Y%m%dT%H%M%SZ')
date_stamp = t.strftime('%Y%m%d') # Date w/o time, used in credential scope
# ************* TASK 1: CREATE A CANONICAL REQUEST *************
# http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html
# Step 1 is to define the verb (GET, POST, etc.)--already done.
# Step 2: Create canonical URI--the part of the URI from domain to query
# string (use '/' if no path)
canonical_uri = '/putMedia'
## Step 3: Create the canonical query string. In this example, request
# parameters are passed in the body of the request and the query string
# is blank.
canonical_querystring = ''
# Step 4: Create the canonical headers. Header names must be trimmed
# and lowercase, and sorted in code point order from low to high.
# Note that there is a trailing n.
canonical_headers = 'content-type:' + content_type + 'n' + 'host:' + host + 'n' + 'x-amz-content-sha256:' + 'UNSIGNED-PAYLOAD' + 'n' + 'x-amz-date:' + amz_date + 'n' + 'x-amz-target:' + amz_target + 'n' + 'x-amzn-fragment-timecode-type:' + 'ABSOLUTE' + 'n' + 'x-amzn-producer-start-timestamp:' + start_tmstp + 'n' + 'x-amzn-stream-name:' + 'ExampleStream' + 'n'
# Step 5: Create the list of signed headers. This lists the headers
# in the canonical_headers list, delimited with ";" and in alpha order.
# Note: The request can include any headers; canonical_headers and
# signed_headers include those that you want to be included in the
# hash of the request. "Host" and "x-amz-date" are always required.
# For DynamoDB, content-type and x-amz-target are also required.
signed_headers = 'content-type;host;x-amz-content-sha256;x-amz-date;x-amz-target;x-amzn-fragment-timecode-type;x-amzn-producer-start-timestamp;x-amzn-stream-name'
# Step 6: Create payload hash. In this example, the payload (body of
# the request) contains the request parameters.
# Step 7: Combine elements to create canonical request
canonical_request = method + 'n' + canonical_uri + 'n' + canonical_querystring + 'n' + canonical_headers + 'n' + signed_headers
# ************* TASK 2: CREATE THE STRING TO SIGN*************
# Match the algorithm to the hashing algorithm you use, either SHA-1 or
# SHA-256 (recommended)
algorithm = 'AWS4-HMAC-SHA256'
credential_scope = date_stamp + '/' + region + '/' + service + '/' + 'aws4_request'
string_to_sign = algorithm + 'n' + amz_date + 'n' + credential_scope + 'n' + hashlib.sha256(canonical_request.encode('utf-8')).hexdigest()
# ************* TASK 3: CALCULATE THE SIGNATURE *************
# Create the signing key using the function defined above.
signing_key = getSignatureKey(secret_key, date_stamp, region, service)
# Sign the string_to_sign using the signing_key
signature = hmac.new(signing_key, (string_to_sign).encode('utf-8'), hashlib.sha256).hexdigest()
# ************* TASK 4: ADD SIGNING INFORMATION TO THE REQUEST *************
# Put the signature information in a header named Authorization.
authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ', ' + 'SignedHeaders=' + signed_headers + ', ' + 'Signature=' + signature
# # Python note: The 'host' header is added automatically by the Python 'requests' library.
headers = {
'Content-Type':content_type,
'x-amzn-fragment-timecode-type': 'ABSOLUTE',
'x-amzn-producer-start-timestamp': start_tmstp,
'x-amzn-stream-name': 'ExampleStream',
'X-Amz-Target':amz_target,
'x-amz-content-sha256':'UNSIGNED-PAYLOAD',
'Authorization':authorization_header
}
# ************* SEND THE REQUEST *************
print('nBEGIN REQUEST++++++++++++++++++++++++++++++++++++')
print('Request URL = ' + endpoint)
r = requests.post(endpoint, data=request_parameters, headers=headers)
print('nRESPONSE++++++++++++++++++++++++++++++++++++')
print('Response code: %dn' % r.status_code)
print(r.text)
我花了大约一周的时间在这个问题上。请帮助我。
PutMedia 的输入不是帧，您需要向其提供 MKV 格式输入。你可以在这里参考Java中PutMedia的类似例子：https://docs.aws.amazon.com/kinesisvideostreams/latest/dg/examples-putmedia.html