I think this will work:
```ex
structure = [
  child(:source, %Membrane.File.Source{location: "sample.mp3"}),
  child(:sink, %Membrane.Hackney.Sink{method: :put, location: build_uri("my_store", "sample.mp3"), headers: [access_key(), {"content-type", "audio/flac"}]}),
  get_child(:source) |> child(:sink)
]

{[spec: {structure}, playback: :playing], %{}}```

can you try and then let me know whether this helped?

I don't see what is changed? sorry, I mus t be blind atm.

Okay, with `{[spec: {structure}, playback: :playing], %{}}` I get the `Invalid structure specification` error

```** (exit) an exception was raised:
    ** (Membrane.ParentError) Invalid structure specification: [{[%Membrane.ChildrenSpec.StructureBuilder{children: [{:source, %Membrane.File.Source{location: "./sample.mp3", chunk_size: 2048}, %{get_if_exists: false}}], links: [], status: :done, from_pad: nil, from_pad_props: nil, to_pad: nil, to_pad_props: nil, link_starting_child: :source}, %Membrane.ChildrenSpec.StructureBuilder{children: [{:sink, %Membrane.Hackney.Sink{location: "https://cdn.with.buckets/upload_type=media&name=sample.mp3", method: :put, headers: [{"AccessKey", "foobar"}, {"content-type", "audio/flac"}], hackney_opts: [], demand_size: 1024}, %{get_if_exists: false}}], links: [], status: :done, from_pad: nil, from_pad_props: nil, to_pad: nil, to_pad_props: nil, link_starting_child: :sink}, %Membrane.ChildrenSpec.StructureBuilder{children: [{:sink, [], %{get_if_exists: false}}], links: [%{from: :source, from_pad: :output, from_pad_props: %{options: []}, to: :sink, to_pad: :input, to_pad_props: %{auto_demand_size: nil, min_demand_factor: nil, options: [], target_queue_size: nil, throttling_factor: 1, toilet_capacity: nil}}], status: :done, from_pad: :output, from_pad_props: %{options: []}, to_pad: :input, to_pad_props: %{auto_demand_size: nil, min_demand_factor: nil, options: [], target_queue_size: nil, throttling_factor: 1, toilet_capacity: nil}, link_starting_child: :sink}]}]. The link lacks it destination.
See `Membrane.ChildrenSpec` for information on specifying structure.```

I think you need `spec: [structure] ` or `spec: {structure, []}` 

https://hexdocs.pm/membrane_core/Membrane.Pipeline.Action.html#t:spec_t/0

https://hexdocs.pm/membrane_core/Membrane.ChildrenSpec.html#t:t/0

With `{[spec: [structure], playback: :playing], %{}}` I get the error
```
** (MatchError) no match of right hand side value: {:error, {%Membrane.ParentError{message: "Invalid children config: {:sink, [], %{get_if_exists: false}}"}, [{Membrane.Core.Parent.ChildEntryParser, :parse_child, 1, [file: 'lib/membrane/core/parent/child_entry_parser.ex', line: 40]}, {Enum, :"-map/2-lists^map/1-0-", 2, [file: 'lib/enum.ex', line: 1658]}, {Membrane.Core.Parent.ChildLifeController, :setup_children, 3, [file: 'lib/membrane/core/parent/child_life_controller.ex', line: 189]}, {Enum, :"-flat_map_reduce/3-fun-1-", 3, [file: 'lib/enum.ex', line: 1288]}, {Enumerable.List, :reduce, 3, [file: 'lib/enum.ex', line: 4751]}, {Enum, :flat_map_reduce, 3, [file: 'lib/enum.ex',
line: 1287]}, {Membrane.Core.Parent.ChildLifeController, :handle_spec, 2, [file: 'lib/membrane/core/parent/child_life_controller.ex', line: 124]}, {Membrane.Core.CallbackHandler, :"-handle_callback_result/5-fun-0-", 5, [file: 'lib/membrane/core/callback_handler.ex', line: 187]}]}}
    lib/membrane_demo/simple_pipeline.ex:88: (file)
    (elixir 1.14.2) lib/kernel/parallel_compiler.ex:346: anonymous fn/5 in Kernel.ParallelCompiler.spawn_workers/7
```

With `{[spec: {structure, []}, playback: :playing], %{}}`
I get the error
```
** (exit) an exception was raised:
    ** (Membrane.ParentError) Invalid children config: {:sink, [], %{get_if_exists: false}}
        (membrane_core 0.11.3) lib/membrane/core/parent/child_entry_parser.ex:40: Membrane.Core.Parent.ChildEntryParser.parse_child/1
        (elixir 1.14.2) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
        (elixir 1.14.2) lib/enum.ex:1658: Enum."-map/2-lists^map/1-0-"/2
        (membrane_core 0.11.3) lib/membrane/core/parent/child_life_controller.ex:189: Membrane.Core.Parent.ChildLifeController.setup_children/3
        (elixir 1.14.2) lib/enum.ex:1288: anonymous fn/3 in Enum.flat_map_reduce/3
        (elixir 1.14.2) lib/enum.ex:4751: Enumerable.List.reduce/3
        (elixir 1.14.2) lib/enum.ex:1287: Enum.flat_map_reduce/3
        (membrane_core 0.11.3) lib/membrane/core/parent/child_life_controller.ex:124: Membrane.Core.Parent.ChildLifeController.handle_spec/2
```

Not sure what I'm missing here? 🤷‍♂️

Seems to be working with
```
structure = [
      child(:source, %Membrane.File.Source{location: "./sample.mp3"})
      |> child(:sink, %Membrane.Hackney.Sink{method: :put, location: build_uri("my_store", "sample.mp3"), headers: [access_key(), {"content-type", "audio/flac"}]}),
]
 
{[spec: {structure, []}, playback: :playing], %{}}
```

Now I have to figure out why the `Membrane.Hackney.Sink` is giving me errors.

Is your latest code snippet working but the earlier one not? 

I just noticed another error in the earlier code example that you weren't using either `get_child(:sink)` or the `:get_if_exists` option on `child/3` when actually linking the source and the sink. However, in the latest snippet you posted you are directly linking them without the need to reference an element created earlier in the pipeline.

Yes, the latest snippet works, but the first doesn't. It was unclear to me from the examples that I saw how to link them. I was also unaware that I needed `:get_if_exists`. I followed the "upgrading to v0.11.0" guide and I don't recall it mentioning that (or I somehow missed it). From what I understand the docs/examples will be updated as soon as v1.0.0 is released.
Thank you for clarifying Why the first snippet doesn't work while the last one does. The error messages were pretty clearly indicating that `:get_if_exists` was set to false. I didn't know where that was coming from. I had assumed that it was coming from the `File.Source`.

Help upgrading to v0.11.0

threequarterspi

15 responses

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