# Mp3 playlist through HTTP out

**URL:** <https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541>\
**Category:** General\
**Created:** [14 September 2019 18:55 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541 "2019-09-14T18:55:18Z")\
**Posts on this page:** 12\
**Page:** 1

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [14 September 2019 18:55 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/1 "2019-09-14T18:55:18Z")

</div>

Hi all,

I'm struggling with this for a while. I'm trying to play all mp3 urls, one-by-one, through the HTTP out node. It works only when the function node is:

msg.payload = msg.payload[0].url;  
return msg;

But when I'm trying to play the entire array, it fails. I'm sure I'm missing something here...  
Any ideas to make it work? 10x

Here's my flow:

```auto
[{"id":"c737fb49.1834d8","type":"http in","z":"c3131846.ef3fe8","name":"","url":"/playlist","method":"get","upload":false,"swaggerDoc":"","x":75,"y":165.25,"wires":[["d2e4ca04.dde7d8"]]},{"id":"7130c772.6ee758","type":"function","z":"c3131846.ef3fe8","name":"Array","func":"//msg.topic=\"word1\"\n//msg.payload = msg.payload[0].url;\n//return msg;\n\nvar msgList = [];\nvar letterList = msg.payload;\nfor (var i =0 ; i < 5; i++){\n msgList.push({payload:letterList[i].url});\n}\n\nmsg.payload = msgList;\nreturn msg;","outputs":1,"noerr":0,"x":214.375,"y":247.75,"wires":[["9e7a33ad.4330b"]]},{"id":"fee8e102.5fb1a","type":"change","z":"c3131846.ef3fe8","name":"","rules":[{"t":"set","p":"url","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":464.75006103515625,"y":274.58331298828125,"wires":[["5142f40f.23405c","e20b14db.c4dfd8"]]},{"id":"e20b14db.c4dfd8","type":"http request","z":"c3131846.ef3fe8","name":"","method":"GET","ret":"bin","paytoqs":false,"url":"","tls":"","proxy":"","authType":"","x":587.472412109375,"y":323.77764892578125,"wires":[["9419c512.606338"]]},{"id":"9419c512.606338","type":"change","z":"c3131846.ef3fe8","name":"Set Headers","rules":[{"t":"set","p":"headers","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"headers.content-type","pt":"msg","to":"audio/mp3","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":694.3056030273438,"y":271.97210693359375,"wires":[["6d5f2037.2e368","c9fea8b8.e61df8"]]},{"id":"6d5f2037.2e368","type":"http response","z":"c3131846.ef3fe8","name":"","statusCode":"","headers":{},"x":822.9722290039062,"y":314.388916015625,"wires":[]},{"id":"9e7a33ad.4330b","type":"delay","z":"c3131846.ef3fe8","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"2","nbRateUnits":"","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":288.75001525878906,"y":286.5,"wires":[["fee8e102.5fb1a"]]},{"id":"c9fea8b8.e61df8","type":"debug","z":"c3131846.ef3fe8","name":"","active":false,"console":"false","complete":"false","x":826.5,"y":218.75,"wires":[]},{"id":"5142f40f.23405c","type":"debug","z":"c3131846.ef3fe8","name":"","active":true,"console":"false","complete":"false","x":601,"y":221,"wires":[]},{"id":"d2e4ca04.dde7d8","type":"function","z":"c3131846.ef3fe8","name":"mp3","func":"msg.payload = \n[{\"url\":\"https://freesound.org/data/previews/179/179101_3332582-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/428/428908_8584880-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/340/340481_313780-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/476/476542_9786444-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/482/482385_3442171-lq.mp3\"}]\nreturn msg;","outputs":1,"noerr":0,"x":155,"y":205,"wires":[["7130c772.6ee758"]]},{"id":"b2fd8f41.38a24","type":"inject","z":"c3131846.ef3fe8","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":60.5,"y":319,"wires":[["d2e4ca04.dde7d8"]]}]

```

---

<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [14 September 2019 19:14 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/2 "2019-09-14T19:14:59Z")

</div>

Try adding a function node before your http request node to check you are sending it what you think you are

---

<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [14 September 2019 19:16 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/3 "2019-09-14T19:16:25Z")

</div>

Function or debug?

---

<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [14 September 2019 19:20 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/4 "2019-09-14T19:20:47Z")

</div>

yep meant debug

---

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [14 September 2019 19:29 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/5 "2019-09-14T19:29:30Z")

</div>

Thanks, I did - and it's all going well until the HTTP requests node for a binary buffer. This is my point of failure, I guess. At that point the debugger shouts "Error: Invalid URI".

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [14 September 2019 19:39 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/6 "2019-09-14T19:39:49Z")

</div>

Your function node:

```auto
var msgList = [];
var letterList = msg.payload;
for (var i =0 ; i < 5; i++){
    msgList.push({payload:letterList[i].url});
}

msg.payload = msgList;
return msg;

```

This only returns 1 message with an array.

Instead I would use something like:

```auto
var l = msg.payload;
for (var i =0 ; i < l.length; i++){
   node.send({url:l[i].url});
}

```

Remove the `msg.url` change node and connect the delay node to the first http request node.

---

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [14 September 2019 19:53 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/7 "2019-09-14T19:53:00Z")

</div>

Thanks, I did it. Almost there. the debugger shows the buffers, but the HTTP out is not returning anything - only ""No response object""

Here's the updated flow:

```auto
[{"id":"c737fb49.1834d8","type":"http in","z":"c3131846.ef3fe8","name":"","url":"/playlist","method":"get","upload":false,"swaggerDoc":"","x":75,"y":165.25,"wires":[["d2e4ca04.dde7d8"]]},{"id":"7130c772.6ee758","type":"function","z":"c3131846.ef3fe8","name":"Array","func":"//msg.topic=\"word1\"\n//msg.payload = msg.payload[0].url;\n//return msg;\n\nvar l = msg.payload;\nfor (var i =0 ; i < l.length; i++){\n node.send({url:l[i].url});\n}","outputs":1,"noerr":0,"x":232.375,"y":256.75,"wires":[["e20b14db.c4dfd8"]]},{"id":"e20b14db.c4dfd8","type":"http request","z":"c3131846.ef3fe8","name":"","method":"GET","ret":"bin","paytoqs":false,"url":"","tls":"","proxy":"","authType":"","x":406.472412109375,"y":295.77764892578125,"wires":[["9419c512.606338"]]},{"id":"9419c512.606338","type":"change","z":"c3131846.ef3fe8","name":"Set Headers","rules":[{"t":"set","p":"headers","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"headers.content-type","pt":"msg","to":"audio/mp3","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":579.3056030273438,"y":247.97210693359375,"wires":[["c9fea8b8.e61df8","9e7a33ad.4330b"]]},{"id":"6d5f2037.2e368","type":"http response","z":"c3131846.ef3fe8","name":"","statusCode":"","headers":{},"x":859.9722290039062,"y":319.388916015625,"wires":[]},{"id":"9e7a33ad.4330b","type":"delay","z":"c3131846.ef3fe8","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"2","nbRateUnits":"","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":701.75,"y":305.5,"wires":[["6d5f2037.2e368"]]},{"id":"c9fea8b8.e61df8","type":"debug","z":"c3131846.ef3fe8","name":"","active":true,"console":"false","complete":"false","x":826.5,"y":218.75,"wires":[]},{"id":"d2e4ca04.dde7d8","type":"function","z":"c3131846.ef3fe8","name":"mp3","func":"msg.payload = \n[{\"url\":\"https://freesound.org/data/previews/179/179101_3332582-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/428/428908_8584880-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/340/340481_313780-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/476/476542_9786444-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/482/482385_3442171-lq.mp3\"}]\nreturn msg;","outputs":1,"noerr":0,"x":155,"y":205,"wires":[["7130c772.6ee758"]]},{"id":"b2fd8f41.38a24","type":"inject","z":"c3131846.ef3fe8","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":99.5,"y":318,"wires":[["d2e4ca04.dde7d8"]]}]

```

Further ideas? 10x

---

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [14 September 2019 20:01 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/8 "2019-09-14T20:01:23Z")

</div>

To be honest I am no hero with bufferstuff. Is this webpage supposed to play audio one by one ?  
I am not sure if you can do that.

---

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [14 September 2019 20:43 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/9 "2019-09-14T20:43:40Z")

</div>

Yes the http out node is playing audio for a single url, i.e. msg.payload[0].url;  
But when it comes to multiple URLs it's different.  
Here's a working example, for a single element, I believe it's doable

```auto
[{"id":"c737fb49.1834d8","type":"http in","z":"c3131846.ef3fe8","name":"","url":"/playlist","method":"get","upload":false,"swaggerDoc":"","x":80,"y":90.25,"wires":[["d2e4ca04.dde7d8"]]},{"id":"7130c772.6ee758","type":"function","z":"c3131846.ef3fe8","name":"Array","func":"msg.topic=\"word1\"\nmsg.payload = msg.payload[0].url;\nreturn msg;\n\n//var l = msg.payload;\n//for (var i =0 ; i < l.length; i++){\n// node.send({url:l[i].url});\n//}","outputs":1,"noerr":0,"x":241.375,"y":210.75,"wires":[["fee8e102.5fb1a"]]},{"id":"fee8e102.5fb1a","type":"change","z":"c3131846.ef3fe8","name":"","rules":[{"t":"set","p":"url","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":284.75006103515625,"y":272.58331298828125,"wires":[["e20b14db.c4dfd8"]]},{"id":"e20b14db.c4dfd8","type":"http request","z":"c3131846.ef3fe8","name":"","method":"GET","ret":"bin","paytoqs":false,"url":"","tls":"","proxy":"","authType":"","x":338.472412109375,"y":328.77764892578125,"wires":[["9e7a33ad.4330b"]]},{"id":"9419c512.606338","type":"change","z":"c3131846.ef3fe8","name":"Set Headers","rules":[{"t":"set","p":"headers","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"headers.content-type","pt":"msg","to":"audio/mp3","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":519.3056030273438,"y":278.97210693359375,"wires":[["c9fea8b8.e61df8","6d5f2037.2e368"]]},{"id":"6d5f2037.2e368","type":"http response","z":"c3131846.ef3fe8","name":"","statusCode":"","headers":{},"x":760.9722290039062,"y":262.388916015625,"wires":[]},{"id":"9e7a33ad.4330b","type":"delay","z":"c3131846.ef3fe8","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"2","nbRateUnits":"","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":497.75,"y":355.5,"wires":[["9419c512.606338"]]},{"id":"c9fea8b8.e61df8","type":"debug","z":"c3131846.ef3fe8","name":"","active":true,"console":"false","complete":"false","x":640.5,"y":191.75,"wires":[]},{"id":"d2e4ca04.dde7d8","type":"function","z":"c3131846.ef3fe8","name":"mp3","func":"msg.payload = \n[{\"url\":\"https://freesound.org/data/previews/179/179101_3332582-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/428/428908_8584880-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/340/340481_313780-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/476/476542_9786444-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/482/482385_3442171-lq.mp3\"}]\nreturn msg;","outputs":1,"noerr":0,"x":164,"y":159,"wires":[["7130c772.6ee758"]]},{"id":"b2fd8f41.38a24","type":"inject","z":"c3131846.ef3fe8","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":108.5,"y":272,"wires":[["d2e4ca04.dde7d8"]]}]

```

---

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [16 September 2019 14:45 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/10 "2019-09-16T14:45:13Z")

</div>

Ok, not giving up yet.  
Since the `http response` node is able to play a single mp3 file,  
rather than array of mp3 files one-by-one, with the current function node:

```auto
msg.payload = msg.payload[0].url;
return msg;

```

I tried to merge/join/concat the audio files into one single file with [ffmpeg-concat](https://github.com/transitive-bullshit/ffmpeg-concat)  
by adding a function node before the current function node - with no luck.

The [ffmpeg-concat](https://github.com/transitive-bullshit/ffmpeg-concat) does not seem to work in the demo as well.  
Does anyone has experience with [ffmpeg-concat](https://github.com/transitive-bullshit/ffmpeg-concat) or other audio joining/merging methods for node-red? Here's the current flow:

 ![Untitled](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/8/829c5350a30831c75008f8f9e600e64dada618f7.jpeg)

Thanks

---

<div class="post-metadata">

**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [16 September 2019 15:46 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/11 "2019-09-16T15:46:26Z")

</div>

If you can detect the end of the previous track playing then you could use a triggered queue to play them... ege [https://flows.nodered.org/flow/cea8afa28b7a93ebdc0f](https://flows.nodered.org/flow/cea8afa28b7a93ebdc0f) (which was doing a TTS instead of playback but...)

---

<div class="post-metadata">

**Author:** ![gilad](https://avatars.discourse-cdn.com/v4/letter/g/5f9b8f/32.png) [@gilad](https://discourse.nodered.org/u/gilad)\
**Post date:** [16 September 2019 18:30 UTC](https://discourse.nodered.org/t/mp3-playlist-through-http-out/15541/12 "2019-09-16T18:30:17Z")

</div>

Thanks dceejay,

Tried this trigger-queue concept, and also tried the logic of a counter, [Counter (flow) - Node-RED](https://flows.nodered.org/flow/081ca5e25b7345bf046d)  
to increase automatically `msg.payload[0].url;` value by one to `msg.payload[1].url;` at the same http endpoint,  
I'm still getting "502 bad gateway error" when using the `http response` node.

> 502 Bad Gateway: Registered endpoint failed to handle the request.

But when I'm using the array version of this flow, with the [play audio](https://flows.nodered.org/node/node-red-contrib-play-audio) node at the end, I'm able to hear audio, not through http though.

The big question then, is how can we make the same thing through http out?  
Any new direction is highly appreciated.

Current flow:

```auto
[{"id":"7d6e6a59.d22084","type":"http in","z":"8ced2aec.35a9f8","name":"","url":"/playlists","method":"get","upload":true,"swaggerDoc":"","x":136,"y":132,"wires":[["d186f610.234598"]]},{"id":"d186f610.234598","type":"function","z":"8ced2aec.35a9f8","name":"mp3","func":"msg.payload = \n[{\"url\":\"https://freesound.org/data/previews/179/179101_3332582-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/428/428908_8584880-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/340/340481_313780-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/476/476542_9786444-lq.mp3\"},\n{\"url\":\"https://freesound.org/data/previews/482/482385_3442171-lq.mp3\"}]\nreturn msg;","outputs":1,"noerr":0,"x":291,"y":172.75,"wires":[["8a42304d.cbb28"]]},{"id":"8a42304d.cbb28","type":"function","z":"8ced2aec.35a9f8","name":"Array","func":"//msg.topic=\"word1\"\n//msg.payload = msg.payload[0].url;\n//return msg;\n\nvar l = msg.payload;\nfor (var i =0 ; i < l.length; i++){\nnode.send({url:l[i].url}); }\n\n\n","outputs":1,"noerr":0,"x":404.375,"y":206.5,"wires":[["74352ee5.7ef29"]]},{"id":"dd54d10d.43204","type":"inject","z":"8ced2aec.35a9f8","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":true,"onceDelay":0.1,"x":150,"y":188.75,"wires":[["d186f610.234598"]]},{"id":"74352ee5.7ef29","type":"http request","z":"8ced2aec.35a9f8","name":"","method":"GET","ret":"bin","paytoqs":false,"url":"","tls":"","proxy":"","authType":"","x":373.472412109375,"y":263.52764892578125,"wires":[["d447536.2e2a2b"]]},{"id":"8957e3ab.7aa25","type":"change","z":"8ced2aec.35a9f8","name":"Set Headers","rules":[{"t":"set","p":"headers","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"headers.content-type","pt":"msg","to":"audio/mp3","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":386,"y":436,"wires":[["6d9c8d8.1d29b74","c1d13891.7465f8"]]},{"id":"6d9c8d8.1d29b74","type":"http response","z":"8ced2aec.35a9f8","name":"","statusCode":"","headers":{},"x":575.5,"y":417,"wires":[]},{"id":"c1d13891.7465f8","type":"play audio","z":"8ced2aec.35a9f8","name":"","voice":"","x":589,"y":370,"wires":[]},{"id":"d447536.2e2a2b","type":"delay","z":"8ced2aec.35a9f8","name":"","pauseType":"rate","timeout":"1","timeoutUnits":"seconds","rate":"1","nbRateUnits":"2","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":383.5,"y":318,"wires":[["8957e3ab.7aa25"]]}]

```

thanks