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我有来自苹果的这个公共HLS流：

http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/sl.m3u8

它有以下内容：

curl http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/sl.m3u8
#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=688301
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/0640_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=165135
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/0150_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=262346
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/0240_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=481677
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/0440_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1308077
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/1240_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=1927853
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/1840_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=2650941
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/2540_vod.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=3477293
http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/3340_vod.m3u8

现在我想创建一个 Kinesis Video Stream 生产者。我首先创建一个新的 AWS Linux 2 EC2 实例。我正在使用以下脚本引导此实例：

https://github.com/awslabs/amazon-kinesis-video-streams-producer-sdk-cpp/blob/master/kinesis-video-native-build/install-script-ami

./install-script -a -d -j $MAX_NUM_PARALLEL我对文件中指定的命令没有任何运气install-script-ami。删除-a如下为我做了它：./install-script -d -j $MAX_NUM_PARALLEL。当我运行它时，它搅动了 10 分钟然后失败了。这里的修复是使用以下命令安装 c++：

yum install gcc-c++

所以我重新运行了install-script它，它继续在它停止的地方。再过 20 分钟左右，安装完成，我收到以下提示：

[100%] Built target kvs_producer_plugin_rtsp_demo
**********************************************************
Success in building the Kinesis Video Streams Producer SDK !!!
**********************************************************
Now you can set the environment variables before running the sample applications
by running source set_kvs_sdk_env.sh
Also, you may want to add to the following environment variables to set it permanently
in /root/.bashrc or /root/.bash_profile or /root/.zshrc

最后，我采购了 envars：

source set_kvs_sdk_env.sh

现在我终于要尝试阅读 HLS 流...

gst-launch-1.0 http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/sl.m3u8 ! hlsdemux ! tsdemux ! queue ! video/x-h264 ! h264parse ! qtmux ! filesink
WARNING: erroneous pipeline: no source element for URI "http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/sl.m3u8"

这是我收到警告的时候。在这一点上，我真的很接近，但卡住了。最终我想运行这个命令：

gst-launch-1.0 $STREAM_URL ! hlsdemux ! tsdemux ! queue ! video/x-h264 ! kvssink stream-name=$STREAM_NAME storage-size=512 access-key=$AWS_ACCESS_KEY_ID secret-key=$AWS_SECRET_ACCESS_KEY aws-region="us-east-1"

我在这里做错了什么？为什么WARNING: erroneous pipeline: no source element for URI我使用的每个 HLS URL 都会收到警告？

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