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## ffmpeg-multi-instances-xargs.md

      
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                Koulil77
                / ffmpeg-multi-instances-xargs.md
            
            
              Created
              October 14, 2017 06:55
                — forked from Brainiarc7/ffmpeg-multi-instances-xargs.md
            
              
                This gist will show you how to launch multiple ffmpeg instances with xargs, very useful for NVIDIA NVENC based encoding where standard GPUs limit the maximum simultaneous encode sessions to two.
              
          
    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.

  
## ffmpeg-hevc-encode-nvenc.md

      
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                Koulil77
                / ffmpeg-hevc-encode-nvenc.md
            
            
              Created
              October 14, 2017 06:54
            
              
                This gist shows you how to encode specifically to HEVC with ffmpeg's NVENC on supported hardware, with a two-pass profile and optional CUVID-based hardware-accelerated decoding. 
              
          
    Encoding high-quality HEVC content  with FFmpeg - based NVENC encoder on supported hardware:

If you've built ffmpeg as instructed here on Linux and the ffmpeg binary is in your path, you can do fast HEVC encodes as shown below, using NVIDIA's NPP's libraries to vastly speed up the process.
Now, to do a simple NVENC encode in 1080p, (that will even work for Maxwell Gen 2 (GM200x) series), start with:
ffmpeg  -i <inputfile>  \
-filter:v hwupload_cuda,scale_npp=w=1920:h=1080:format=nv12:interp_algo=lanczos,hwdownload \

-c:v hevc_nvenc -profile main -preset slow -rc vbr_hq \

  
## hls_to_sdi.sh
#!/bin/bash

ffmpeg \
    -i "http://live.m2.tv:80/hls/stream.m3u8" \
    -vf "scale=720:576,fps=fps=25,setdar=dar=16/9,format=pix_fmts=uyvy422" \
    -af "aresample=48000" -ac 2 \
        -f decklink -y "DeckLink Mini Monitor" \
    -acodec copy -vcodec copy \
        -f mpegts \
        -y "udp://239.1.100.2:10480?localaddr=10.1.5.57&pkt_size=1316&fifo_size=1000000" \

## getgop.sh
#!/bin/sh

startswith() { case $1 in $2*) true;; *) false;; esac; }

ffprobe_output=$( ffprobe -show_frames "$1" 2>&1 )

GOP=1
maxGOP=1
Bframes=0
M=0

## dash-avc264 command lines
See my DASH-IF presentation from October, 2014:
https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

1. encode multiple bitrates with keyframe alignment:
   ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
     -g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

   My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
   size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

## SDI2-SD-qsv.sh
#!/bin/bash

D1="[f=hls:hls_flags=delete_segments:hls_list_size=10:hls_time=20]/var/www/html/hls2/stream.m3u8"
D2="[f=mpegts]udp://239.1.1.2:10480?localaddr=10.1.5.99&pkt_size=1316&fifo_size=1000000"
D3="[f=dash:window_size=5:extra_window_size=5:remove_at_exit=1]/var/www/html/dash2/stream.mpd"

ffmpeg \
    -v verbose \
    -f decklink -i "DeckLink SDI (2)@3" \
    -vcodec h264_qsv -a53cc 0 \

## dash2.html

<!DOCTYPE html>
<html><head><meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta http-equiv="content-type" content="text/html;">
<meta name="viewport" content="initial-scale=1.0 maximum-scale=1.0 user-scalable=no">
<title>M2</title>
<meta name="description" content="M2" />
<meta name="keywords" content="" />
<meta name="robots" content="index, nofollow" />

## hls2.html
<html>
<head>

<style>
body {
    width: 982px;
    margin: 50px auto;
}
</style>
	#!/bin/bash

	ffmpeg \
	-i "http://live.m2.tv:80/hls/stream.m3u8" \
	-vf "scale=720:576,fps=fps=25,setdar=dar=16/9,format=pix_fmts=uyvy422" \
	-af "aresample=48000" -ac 2 \
	-f decklink -y "DeckLink Mini Monitor" \
	-acodec copy -vcodec copy \
	-f mpegts \
	-y "udp://239.1.100.2:10480?localaddr=10.1.5.57&pkt_size=1316&fifo_size=1000000" \
	#!/bin/sh

	startswith() { case $1 in $2) true;; ) false;; esac; }

	ffprobe_output=$( ffprobe -show_frames "$1" 2>&1 )

	GOP=1
	maxGOP=1
	Bframes=0
	M=0
	See my DASH-IF presentation from October, 2014:
	https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

	1. encode multiple bitrates with keyframe alignment:
	ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
	-g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

	My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
	size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.
	#!/bin/bash

	D1="[f=hls:hls_flags=delete_segments:hls_list_size=10:hls_time=20]/var/www/html/hls2/stream.m3u8"
	D2="[f=mpegts]udp://239.1.1.2:10480?localaddr=10.1.5.99&pkt_size=1316&fifo_size=1000000"
	D3="[f=dash:window_size=5:extra_window_size=5:remove_at_exit=1]/var/www/html/dash2/stream.mpd"

	ffmpeg \
	-v verbose \
	-f decklink -i "DeckLink SDI (2)@3" \
	-vcodec h264_qsv -a53cc 0 \

	<!DOCTYPE html>
	<html><head><meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=Edge">
	<meta http-equiv="content-type" content="text/html;">
	<meta name="viewport" content="initial-scale=1.0 maximum-scale=1.0 user-scalable=no">
	<title>M2</title>
	<meta name="description" content="M2" />
	<meta name="keywords" content="" />
	<meta name="robots" content="index, nofollow" />
	<html>
	<head>

	<style>
	body {
	width: 982px;
	margin: 50px auto;
	}
	</style>