Add DASH support back in

[davedoesdev]

See early commits on Kagami#166

[rafael2k]

Thanks David! So I should compile this (your) branch, right?

Already started compiling and it seems to be going all good! Just typed "make"!

[rafael2k]

Arrived to the first error:
make[1]: Leaving directory '/home/rafael2k/files/dw/ffmpeg.js/build/ffmpeg-webm'
emcc build/ffmpeg-webm/ffmpeg.bc build/opus/dist/lib/libopus.so build/libvpx/dist/lib/libvpx.so
--post-js build/post-sync.js
-O3 --closure 1 --memory-init-file 0 -s WASM_ASYNC_COMPILATION=0 -s ASSERTIONS=0 -s EXIT_RUNTIME=1 -s TOTAL_MEMORY=67108864 --pre-js build/pre.js -o ffmpeg-webm.js -s NODEJS_CATCH_EXIT=0 -s NODEJS_CATCH_REJECTION=0 -lnodefs.js -lworkerfs.js -s WASM=0
Traceback (most recent call last):
File "/usr/share/emscripten/emcc.py", line 3292, in
sys.exit(main(sys.argv))
File "/usr/share/emscripten/emcc.py", line 3285, in main
ret = run(args)
File "/usr/share/emscripten/emcc.py", line 2156, in run
post_link(options, wasm_target, wasm_target, target)
File "/usr/share/emscripten/emcc.py", line 2253, in post_link
do_binaryen(target, options, wasm_target)
File "/usr/share/emscripten/emcc.py", line 2774, in do_binaryen
run_closure_compiler()
File "/usr/share/emscripten/emcc.py", line 2769, in run_closure_compiler
final_js = building.closure_compiler(final_js, pretty=not minify_whitespace(),
File "/usr/share/emscripten/tools/building.py", line 1027, in closure_compiler
proc = run_process(cmd, stderr=PIPE, check=False, env=env)
File "/usr/share/emscripten/tools/shared.py", line 94, in run_process
ret = subprocess.run(cmd, check=check, input=input, *args, **kw)
File "/usr/lib/python3.9/subprocess.py", line 505, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib/python3.9/subprocess.py", line 951, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.9/subprocess.py", line 1823, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '--max_old_space_size=8192'
make: *** [Makefile:278: ffmpeg-webm.js] Error 1

[davedoesdev]

Are you compiling with separate emsdk? https://emscripten.org/docs/getting_started/downloads.html
It looks like your version of Node doesn't support that argument.

Another way would be to use the Docker image - see https://emscripten.org/docs/getting_started/downloads.html but use davedoesdev/ffmpeg.js instead of kagamihi/ffmpeg.js.

[davedoesdev]

@rafael2k by the way, the example is now up: https://github.com/davedoesdev/streamana

[rafael2k]

Are you compiling with separate emsdk? https://emscripten.org/docs/getting_started/downloads.html It looks like your version of Node doesn't support that argument.

Another way would be to use the Docker image - see https://emscripten.org/docs/getting_started/downloads.html but use davedoesdev/ffmpeg.js instead of kagamihi/ffmpeg.js.

@davedoesdev, I'm compiling with stock versions from Debian 11 repository.

[rafael2k]

@rafael2k by the way, the example is now up: https://github.com/davedoesdev/streamana

Cool, thanks! I'll try with the binaries for now.

[davedoesdev]

OK cool. The stock version from Debian is probably behind quite a bit. emsdk comes with it's own version of Node, for instance.

[davedoesdev]

I'll think about how best to put dash in

[rafael2k]

Yay! I'll update just my node and see if compilation finishes (or try to patch the source).

[davedoesdev]

@rafael2k how are you testing DASH ingestion? Is there an open source server I can test against?

[rafael2k]

In my current DASH workflow I contribute (upload) the live stream to icecast2, then I make ffmpeg connect to it and create the DASH manifest and files on the fly.

[davedoesdev]

Hmm, at the moment I've only tested streaming the generated DASH files to an ingestion URL (like YouTube).
I guess that's not your use case?

[davedoesdev]

I suppose if you had a local web server which accepted POST (or PUT) of the generated DASH files then that might work?

[davedoesdev]

I'll have a look at setting one up locally when I get time.
I should also look at how streaming from the server to the browser works :)

[davedoesdev]

Btw, I merged DASH support into master and streamana

I'll need to test it by ingesting it into a local http server and then playing out the files in a browser

[rafael2k]

Great! Indeed, icecast2 works this way [1] - a PUT to the server. In case of DASH, I think the ingest will be similar, but instead of just one PUT, it will be one PUT per chunk, I think.
[1] https://github.com/social-dist0rtion-protocol/wasm-stream/blob/master/src/icecast.js

[davedoesdev]

@rafael2k in your workflow, where is the desired destination of the DASH files?

[rafael2k]

The desired destination would be a server which can later serve the encoded DASH formatted media through a webserver. But I'm not totally sure yet. The "push" protocol can be REST based, or not. A simple network socket pushing the media to the server would be enough already.

[davedoesdev]

@rafael2k this is now in the UI. You can select DASH or HLS, POST or PUT and the CORS mode.

I tested it PUTting to a local Apache server which I enabled WebDAV on and it worked fine - I could stream the DASH files into a <video> element from a different browser.

[rafael2k]

This is wonderful David. I'll test soon. Cheers!
(And will also try to finally fix my build setup, which is almost there - .wasm gets created and the fail is just for the .js creation)

[davedoesdev]

@rafael2k how did you get on?