Hello guys,
Continuing from this guide to building ffmpeg and libav with NVENC and VAAPI enabled, this snippet will cover advanced options that you can use with ffmpeg and libav on both NVENC and VAAPI hardware-based encoders.
For ffmpeg:
Spawning multiple ffmpeg processes with xargs:
On standard NVIDIA GPUs (Not the Quadros and Tesla lines), NVENC encodes are limited to two simultaneous sessions. The sample below illustrates how to pass a list of AVI files to ffmpeg and encode them to HEVC on two encode sessions:
$ find Videos/ -type f -name \*.avi -print | sed 's/.avi$//' |\
xargs -n 1 -I@ -P 2 ffmpeg -i "@.avi" -c:a aac -c:v hevc_nvenc "@.mp4"
This will find all files with the ending .avi in the directory Videos/ and transcode them into HEVC/H265+AAC files with the ending .mp4. The noteworthy part here is the -P 2 to xargs, which starts up to two processes in parallel.
GNU Parallel is a multipurpose program for running shell commands in parallel, which can often be used to replace shell script loops,find -exec, and find | xargs. It provides the --sshlogin and --sshloginfile options to farm out jobs to multiple hosts, as well as options for sending and retrieving static resources and and per-job input and output files.
For any particular task, however, keeping track of which files need to pushed to and retrieved from the remote hosts is somewhat of a hassle. Furthermore, cancelled or failed runs can leave garbage on the remote hosts, and if input and output files are large, sending them to local disk on the remote hosts is somewhat inefficient.
In a traditional cluster, this problem would be solved by giving all nodes access to a shared filesystem, usually with NFS or something more exotic. However, NFS doesn't wo
Quickly check for supported NVENC and NPP hardware acceleration capabilities in FFmpeg on your platform:
Depending on how you built ffmpeg, you may want to check the supported NVENC-based hardware acceleration capabilities in ffmpeg by running:
$ for i in encoders decoders filters; do
echo $i:; ffmpeg -hide_banner -${i} | egrep -i "npp|cuvid|nvenc|cuda|nvdec"
done
Sample output (as on my testbed):
This gist will help you to compile ffmpeg with NVENC, QSV, VAAPI, VDPAU, and OpenCL support.
nVidia
nvresizepatch is outdated and not more compatible to the latest version of FFmpeg, so it's not included in this documentation.
(even if I've passed a lot of time at trying to make it compile... without any success)
Please don't rely on this page: https://developer.nvidia.com/ffmpeg, the implementation is a hack and was never been added to the main FFmpeg tree.
I work as a full-stack developer at work. We are a Windows & Azure shop, so we are using Windows as our development platform, hence this customization.
For my console needs, I am using Cmder which is based on ConEmu with PowerShell as my shell of choice.
Yes, yes, I know nowadays you can use the Linux subsystem on Windows 10 which allow you to run Ubuntu on Windows. If you are looking for customization of the Ubuntu bash shell, check out this article by Scott Hanselman.
| import alpaca_trade_api as tradeapi | |
| api = tradeapi.REST(key_id=<your key id>,secret_key=<your secret key>) | |
| storageLocation = "<your folder location>" | |
| barTimeframe = "1H" # 1Min, 5Min, 15Min, 1H, 1D | |
| assetsToDownload = ["SPY","MSFT","AAPL","NFLX"] | |
| iteratorPos = 0 # Tracks position in list of symbols to download | |
| assetListLen = len(assetsToDownload) |
| // ==UserScript== | |
| // @name Remove VK ads | |
| // @namespace http://tampermonkey.net/ | |
| // @version 0.2 | |
| // @description Remove VK advertisement | |
| // @author maxxx1313 | |
| // @match https://vk.com/* | |
| // @grant none | |
| // @runat document-end | |
| // ==/UserScript== |
| #!/bin/sh | |
| DEFAULTNMAPOPTIONS="-T4 -sV -Pn --top-ports 5000 -R" | |
| NMAPOPTIONS="$DEFAULTNMAPOPTIONS" | |
| die() { | |
| printf '\033[38;5;9m%s\033[0m\n\n' "$1" >&2 | |
| display_usage | |
| exit 1 | |
| } |
