edit ffmpeg out stream

hacksat hacksat

hi everyone and happy holidays,
I wanted to ask if it was possible to change the out of the tvh stream? if you can do what?

Saen Acro

Be more specific, question is not understandable.

hacksat hacksat

Hello,
I wanted to edit the ffmpeg command that generates the stream, the stream profiles, I wanted to try to make changes directly on the profiles

Saen Acro

useMPEG-TS Spawn/built-in profile

hacksat hacksat

yes understand, but uses a lot of cpu and becomes unstable, at least with the command that I created, then if there is a better command of mine and someone want to give me a hand I thank you

this is my command line
/opt/ffmpeg/bin/ffmpeg -i pipe:0 -preset superfast -bitrate 2000k -bufsize 1500k -c:v libx264 -c:a aac -c:s copy -f mpegts pipe:1

Saen Acro

Use GPU /vaapu, nvidia/, limit treads /-threads 1/, reduce present /ultrafast, realtime/.

hacksat hacksat

hello thanks for the answer,
the problem is that it ignores transcoding,so the channel as it enters goes out -> http://prntscr.com/lzczp3 if limits bitrate or size ignores it, and the cpu I have not solved yet with -threads 1

Saen Acro

ffmpeg -fflags +genpts -nostats -nostdin -hide_banner -loglevel quiet -hwaccel cuvid -c:v h264_cuvid -deint 1 -surfaces 8 -drop_second_field 1 -vsync 0 -resize 1280x720 -i -map 0:v -c:v h264_nvenc -preset slow -profile:v high -level 4.1 -rc vbr -cq 1 -bf 2 -g 25 -b:v 2200k -minrate 2200k -maxrate 2200k -bufsize 1002k -map 0:a -c:a libfdk_aac -ac 2 -b:a 128k -strict experimental

use this as starting point

https://thoaimedia.com/ffmpeg-tools/ffmpeg-command-generator/

hacksat hacksat

But for example i can edit the profile strema like example "webtv-h264-aac-matroska" and add -threads 1 ?
i use this webtv-h264-aac-matroska and work fine, my problem is use all threads and CPU if i set -threads 1 it will use a lot less cpu

Saen Acro

WEBTV profiles are for browser capability
what is your cpu?

hacksat hacksat

this is my CPU
Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz

Saen Acro

With GPU on this CPU you can compress up to 18 HD channels.

https://trac.ffmpeg.org/ticket/5708?cversion=0&cnum_hist=8

hacksat hacksat

with the Nvidia video card?
or GPU integrated?

Saen Acro


With GPU on this CPU

???
Yes with Intel HD 530
https://github.com/rigaya/QSVEnc

hacksat hacksat

unfortunately I'm not an expert on these things, I do not know how to do it, how to move first

hacksat hacksat

sorry, but since I know the simple CPU transcoding with the stream profiles use WEBTV codec AAC and it's always fine online, is there a way to simply add add-1 threads? already doing -1 threads I can make someone in more channels in HD

Saen Acro

modify your

/opt/ffmpeg/bin/ffmpeg -i pipe:0 -preset superfast -bitrate 2000k -bufsize 1500k -c:v libx264 -c:a aac -c:s copy -f mpegts pipe:1

with

/opt/ffmpeg/bin/ffmpeg -i pipe:0 -preset ultrafast -b:v 2048k -minrate 1024k -maxrate 3096k -bufsize 1500k -c:v libx264 -c:a aac -threads 2 -c:s copy -f mpegts pipe:1

or compile tvh with --enable-vaapi
https://tvheadend.org/d/4492-manual-building-deb-packages-on-clean-ubuntu-or-other-debian-distros

hacksat hacksat

thanks for your command

/opt/ffmpeg/bin/ffmpeg -i pipe:0 -preset ultrafast -b:v 2048k -minrate 1024k -maxrate 3096k -bufsize 1500k -c:v libx264 -c:a aac -threads 2 -c:s copy -f mpegts pipe:1

but don't work
the stream start but not trascode in your command there are the
bitrate 2048k
maxrate 3096k

preset ultra fast

but you can see go out 7000/8000k

http://prntscr.com/lzg954

not work the transcoding ffmepg i think

hacksat hacksat

nothing to do, forgive me if I insist, but where is the ffmpeg that creates the profile WEBTV codec AAC
add -threads 1 i think work and solve the preblem

Saen Acro

Test with input url /from playlist/
and output to multicast for example

There is something with is wrong.

test with
http://www.ipvideotrans.com/live-video-transcoding.html