Avideo: How to change encoder settings?

[palich91]

Tell me the encoder settings. I need HLS VOD multi-bitrate encoded only in 480, HD 720, HD 1080
screenshot: http://vfl.ru/fotos/39d87e4329947019.html

[DanielnetoDotCom]

To do that you must understand the FFMPEG command. but I am pretty sure you can find where to change it.

ffmpeg -re -i {$pathFileName} -c:a aac -b:a 128k -c:v libx264 -vf scale=-2:360 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}low/index.m3u8 -c:a aac -b:a 128k -c:v libx264 -vf scale=-2:540 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 1400k -maxrate 1498k -bufsize 2100k -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}sd/index.m3u8 -c:a aac -b:a 128k -c:v libx264 -vf scale=-2:720 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}hd/index.m3u8

[akhilleusuggo]

ffmpeg -i {$pathFileName} -c:v h264 -vf scale=-2:480 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 1500k -maxrate 2000k -bufsize 3000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}low/index.m3u8 -c:v h264 -vf scale=-2:720 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 2500k -maxrate 3000k -bufsize 5000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}sd/index.m3u8 -c:v h264 -vf scale=-2:1080 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -b:v 4000k -maxrate 6000k -bufsize 8000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}hd/index.m3u8

I highly RECOMMEND you to remove the -re flag ( stand for real time ) , this will put your encoder on a speed of x1 ( made for livestreaming , not for VOD ) . Will drop your quality video .
Also you can set a -preset . By default FFMPEG uses -preset medium if no preset has been specified
You also use -crf 23 instead of -b:v to let the encoder decide , and limite the maximum bitrate keeping the -maxrate flag
This is a good option in case a section of the video has no animation , only image sliding , meaning that no much bitrate is needed , the encoder will drop down the bitrate and save you some space disk .

Now on plugin HLS , change :

[palich91]

can you say that means scale = -2: in scale = -2:480

[DanielnetoDotCom]

yes

scale=-2 means Scale the video, keep aspect ratio so that height is adjusted to fit

[palich91]

And what will happen if I indicate this: scale = -1:480.
I want HLS encoded video quality to be excellent

[DanielnetoDotCom]

you should look into the FFMPEG documentations.

[akhilleusuggo]

@palich91 HLS is not the encoder for excellent quality . Even tho any encoder and format could have an excellent quality .
You have to make choices to what you've got ( Hardware ) . Encoder VP9 ( by google ) , output webm for me is the best i've seen . With 1200k bitrate I was able to keep the same quality as source ( 1080p / 30FPS ) . But the time to encode is really slow compared to anything . It's like the x265 but the vp9 is supported on html5 .
You can always use -preset medium or slow and -crf 18 ( the output bitrate could be high )
There's no perfect formula , you need to test and find out what need for your platform .

[palich91]

@akhilleusuggo

I am trying to learn FFMPEG, but it’s hard for me to learn it, I can’t learn all the commands in one go. Advise me how to configure it for myself in accordance with my needs:
I have an VPS: SSD disk, 10 core processor, 60 GB of RAM.

what do I need to do so that the encoder encodes video in 480p, 720p50 and 1080p50?

You have a lot of experience that you can advise so that the video does not lose quality during encoding and takes less time and not much space

This is how i think:
480p: 854x480
-vf scale="'w=if(gt(a,16/9),854,-2):h=if(gt(a,16/9),-2,480)'" -ab 128k -maxrate 1200k -bufsize 4200k
720p: 1280x720
-vf scale="'w=if(gt(a,16/9),1280,-2):h=if(gt(a,16/9),-2,720)'" -ab 196k -maxrate 2000k -bufsize 6400k
1080p: 1920x1080
-vf scale="'w=if(gt(a,16/9),1920,-2):h=if(gt(a,16/9),-2,1080)'" -ab 320k -maxrate 2800k -bufsize 8200k

[akhilleusuggo]

@palich91 Let me guess ( contabo VPS )

I recommend not to set FPS ( -rflag ) . Why ?
If you upload a video with 30 fps , and on your command line you put -r 50 you will duplicate unnecessary frames
Bitrate depends on the video frames . If you gonna upload videos 50-60 fps , 2800k is low ( I recomend -crf 23 or lower to keep the quality of the original video . Audio bitrate 320k is overkilled . Try 192k maximum .
-preset slow

If you can upload a video to see it , would be better .

[palich91]

@ achilleosugo if you have a telegram messenger or any other I can contact you.
I did like this:
ffmpeg -i {$pathFileName} -c:v h264 -vf scale=-2:480 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -crf 23 -maxrate 2000k -bufsize 3000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}low/index.m3u8 -c:v h264 -vf scale=-2:720 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -crf 23 -maxrate 3000k -bufsize 5000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}sd/index.m3u8 -c:v h264 -vf scale=-2:1080 -g 48 -keyint_min 48 -sc_threshold 0 -bf 3 -b_strategy 2 -crf 23 -maxrate 6000k -bufsize 8000k -c:a aac -b:a 128k -f hls -hls_time 15 -hls_list_size 0 -hls_key_info_file {$destinationFile}keyinfo {$destinationFile}hd/index.m3u8
Here is the video I downloaded from youtube https://vicovi.ru/video/61/Другой-мир-в-4К-ultra-hd-3840-х-2160-?channelName=skriptcms
What else can I fix?

[tgd1973]

I take this opportunity to ask if I can use the CUDA Nvidia or x264 for AMD GPU graphics acceleration for the encoder.
If one has a rig of 5 - 6 GPU ... how much would the conversion speed increase ... or maybe in this case if perhaps it is possible to have two or more simultaneous conversions.

[palich91]

I ask for help, video encoding takes a long time but video quality is lost. tell me how to code better?
Tell me how to make H264 encoding

[DanielnetoDotCom]

you can change and customize the FFMPEG commands in the encoder configuration

[palich91]

I know what I can change, but I don’t understand the FFMPEG commands and I ask you for help so that you give a set of commands that will not spoil the video quality and at the same time the video will not weigh much

[DanielnetoDotCom]

I can not help you with FFMPEG. I always use Google for myself

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.