Karl Kroening comments

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                                            Karl Kroening

Add `select_ok` function to detect closed channels during select

Note: #49 fixes CI for this branch

Add `select_ok` function to detect closed channels during select

Cool, no worries.

Multi-thread support for python asyncio gRPC clients

FWIW, this is still an issue as of grpcio 1.51.1. I wonder if the [Caveats](https://grpc.github.io/grpc/python/grpc_asyncio.html#caveats) section of the document should be updated to reflect this. Current explanation: > gRPC Async...

system-git: Redundant clone when referencing multiple packages from the same repo

> I need to reference multiple packages from a private repo I have the same situation and see the same issue with the default Dulwich client on OS X, with...

Drop `future` install-requirement

Hmm, actually the `builtins` module comes from `future` as well and is referenced in several places, so this PR is a bit larger than expected. I'll probably hold off on...

AttributeError: module 'ffmpeg' has no attribute 'input'

```pip install ffmpeg-python``` instead of ```pip install ffmpeg```

How to add "anullsrc" to a video stream prior to concatenation.

Hmm, yeah we really should get #62 mergeable since it's a commonly requested feature. There are a few changes that are still needed on that branch, so I'll bump up...

Memory file -> numpy -> memory file

Because you're reading and writing individual pipe file descriptors with a single python process, you're encountering a deadlock: The `process1.stdin.write` line blocks and waits until process1 is finished reading all...

Memory file -> numpy -> memory file

> Above reading raw video byte use communicate method for stdin. FYI, the `communicate` method is fundamentally different than the second example you posted above - which I think you're...

Ability to track progress of an ffmpeg command

Here's a semi-hacked-together example using gevent and the `-progress` param @Depau mentioned: ```python import gevent.monkey; gevent.monkey.patch_all() import contextlib import ffmpeg import gevent import os import shutil import socket import subprocess...