I am building a Video-on-demand service for a closed community. I using FFMPEG for video processing and dash.js for adaptive bitrate player with custom resolution selector. Can somebody please suggest what ideal bitrates should I use while video/audio transcoding?
I am talking about -b:v and -ab option
ffmpeg -i vid.mp4 -c:v libvpx-vp9 -keyint_min 150 \
-g 150 -tile-columns 4 -frame-parallel 1 -f webm -dash 1 \
-an -vf scale=144:-1 -b:v 120k -dash 1 video_1.webm \
-an -vf scale=240:-1 -b:v 250k -dash 1 video_2.webm \
-an -vf scale=360:-1 -b:v 500k -dash 1 video_3.webm \
-an -vf scale=480:-1 -b:v 750k -dash 1 video_4.webm \
-an -vf scale=720:-1 -b:v 1500k -dash 1 video_5.webm
And
ffmpeg -i vid.mp4 -vn -acodec libvorbis -ab 96k -dash 1 audio_96k.webm
Any suggestions/hacks or examples to tackle real-world network situations are appreciated.
There is no ideal. Every video is different, and every viewer is different. What is ideal for one viewer is not ideal for another. Read the Netflix blog on pert title encoding and vmaf. Also look at Akamai state of the internet reports to determine what average global internet connection speeds are.
Related
I need to concatenate two audios, but I need to keep the size of the video with the size of the audio "backgroud.wav". I'm doing like this:
$code1 = "ffmpeg -y -i voz.wav -i backround.wav -filter_complex amerge -c:a libmp3lame -q:a 4 somnovo2.mp3";
system($code1);
But the result is the size of the audio "voz.wav" which would be 30 seconds. While "background.wav" is 3 minutes long. I need the output to have the time of "background.wav". How can I do this ?
Try apad filter before amerge
$code = 'ffmpeg -y -i voz.wav -i background.wav -filter_complex "[0]apad[a];[a][1]amerge[aout]" -map "[aout]" -c:a libmp3lame -q:a 4 output.mp3'
system($code);
As Anwsonwsymous answer, the final result looked like this:
$code = "ffmpeg -y -i voz.wav -i background.wav -filter_complex \"[0]apad[a];[a][1]amerge[aout]\" -map \"[aout]\" -c:a libmp3lame -q:a 4 output.mp3";
$code1 = "ffmpeg -loop 1 -i result.jpg -i output.mp3 -shortest -acodec copy fim.mp4";
system($code);
system($code1);
The
system($code);
merges the two audios into one, keeping the background audio repeating until the end.
End
system($code2);
merges the finished audio with an image and converts it to .mp4 video with the duration of the background audio.
I have a web site where user upload videos.
When a video is uploaded I shell_exec 3 ffmpeg commands:
Generate preview:
$cmd = "ffmpeg -ss 1 -i ".$filePath." -vf \"scale='if(gt(dar,360/202),202*dar,360)':'if(gt(dar,360/202),202,360/dar)',setsar=1,crop=360:202\" -frames:v 1 ".$thumbnail;
Compress the video:
$cmd = "ffmpeg -i ".$filePath." -c:v libx264 -crf 23 -preset veryfast -c:a aac -ab 128k -movflags faststart ".$wmoutput;
Add watermark:
$cmd = 'ffmpeg -i '.$wmoutput.' -i new/watermark.png -filter_complex "overlay=10:10" '.$finaloutput;
The problem is that these 3 commands take a lot of time to finish and sometimes it goes over Maximum execution time specialy for video files that are bigger than 300Mo. I can just expand the Maximum execution time but I don't know how many seconds I have to set.
Is there a way to make the scripts above execute faster without having to change the Maximum execution time?
Combine Compress the video and add watermark into one command:
ffmpeg -i input.mp4 -i new/watermark.png -filter_complex "overlay=10:10" -c:v libx264 -crf 23 -preset veryfast -c:a aac -ab 128k -movflags faststart output.mp4
Should be significantly faster and you avoid yet another instance of generation loss.
User can upload any movie (.mov .mpg .avi .flv and many more) And now i would like cut this file from 15 to 25 seconds (part will be 10 seconds only) and convert this small part to FLV as preview of movie.
Now i have some questions:
Should i convert all uploaded movie to flv ? or cut part only and all movie file make as zip ?
How can i cut this file in php 7 ? is it possible ? i found
ffmpeg -ss [start] -i in.mp4 -t [duration] -c copy out.mp4
but this is only for mp4 ?
For HTML5 you can output various formats for compatibility. For example, H.264 + AAC in MP4, H.265/HEVC + AAC in MP4, and VP9 + Opus in Webm:
ffmpeg -ss 30 -t 10 -i input \
-c:v libx264 -preset medium -crf 23 -pix_fmt yuv420p -c:a aac -movflags +faststart h264.mp4 \
-c:v libx265 -preset medium -crf 28 -pix_fmt yuv420p -c:a aac -movflags +faststart h265.mp4 \
-c:v libvpx-vp9 -crf 30 -b:v 2000k -c:a libopus vp9.webm
Adjust -preset, -crf, anf -b:v to your needs. Implementing this into shell_exec should be trivial for those familiar with PHP.
See the following FFmpeg Wiki articles for more info: PHP, H.264, H.265, VP9.
I have to convert some video to "h264" using FFmpeg.When I hit the below command as a cloud user with ssh login it converts successful.
ffmpeg -i /var/www/media/photos/video_demo/55291482115655.MP4 -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:300 -threads 0 -pass 1 -codec:a libfdk_aac -b:a 500k -f mp4 /var/www/media/photos/video_demo/5888.MP4.
But when I run this command using PHP it gives me an error.
$cmd = "ffmpeg -i /var/www/media/photos/video_demo/55291482115655.MP4 -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:300 -threads 0 -pass 1 -codec:a libfdk_aac -b:a 500k -f mp4 /var/www/media/photos/video_demo/85493.MP4 ";
exec($cmd .' 2>&1', $outputAndErrors, $return_value);
php error: Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
I also followed this link similar to my problem but still not get solution for this problem,In my server there is 3 FFmpeg installed.
cpulimit -l 180 ffmpeg-static/ffmpeg -ss 0 -t 8.96 -i '/var/www/html/Videos2/Character Jack/Happy/happy birthday scene.mp4' -filter_complex '[0] drawtext=textfile=scene2.txt:fontsize=199.68:fontfile=/var/www/html/fonts/Arial.ttf:x=288:y=409:fontcolor_expr=ffffff%{eif\: clip(1+(255*t/4)\, 0\, 255)\:x\:2}' -pass 1 -f h264 -y - > /dev/null &&
cpulimit -l 180 ffmpeg-static/ffmpeg -ss 0 -t 8.96 -i '/var/www/html/Videos2/Character Jack/Happy/happy birthday scene.mp4' -i '/var/www/html/Userfiles/Users/blaze/Projects/earl3x/audio/scene2_music.x.mp3' -filter_complex '[1] volume=0.95 [au1]; [0][au1] amix=inputs=2:duration=shortest' -c:v copy -c:a libmp3lame -pix_fmt yuv420p -preset ultrafast -shortest -movflags faststart -y -pass 2 /var/www/html/Userfiles/Users/blaze/example/earl4x/scene2.mp4
What i'm trying to achieve ?
encoding text elements / graphics on the first pass
and encoding Sound (audio) on the second pass
the first pass and second pass runs fine ( with no errors at all)
and the output has no artifact.
however the text is totally no where to be found!
what it seems like is that , the second pass had no idea there was a first pass with text encoded in it.
what will be the right way to run / format the command ?
thanks
i solved this.
i had to go through another method
-generate the video with with draw text ( dont parse the -pass 1 parameter)
just run your output normally
-put you output url as the input url of the next command (use -y and remember no passes)
add the audio file as the second input parameter
-output a final file
note things could get really muddy if you have a series of complex combinations
so i have to figure out an algorithm specific to my case that worked.
The drawtext has to be applied both times. What pass 1 is generate the video, analyze video and then discard it, so drawtext has to be present for pass 2 as well.
ffmpeg -ss 0 -t 8.96 -i '/var/www/html/Videos2/Character Jack/Happy/happy birthday scene.mp4' \
-filter_complex \
'[0] drawtext=textfile=scene2.txt:fontsize=199.68:fontfile=/var/www/html/fonts/Arial.ttf: \
x=288:y=409: \
fontcolor_expr=ffffff%{eif\: clip(1+(255*t/4)\, 0\, 255)\:x\:2}' \
-pass 1 -c:v libx264 -f null -
2nd pass:
ffmpeg -ss 0 -t 8.96 -i '/var/www/html/Videos2/Character Jack/Happy/happy birthday scene.mp4' \
-i '/var/www/html/Userfiles/Users/blaze/Projects/earl3x/audio/scene2_music.x.mp3' \
-filter_complex \
'[0] drawtext=textfile=scene2.txt:fontsize=199.68:fontfile=/var/www/html/fonts/Arial.ttf: \
x=288:y=409: \
fontcolor_expr=ffffff%{eif\: clip(1+(255*t/4)\, 0\, 255)\:x\:2}[v];
[1]volume=0.95 [au1]; [0][au1] amix=inputs=2:duration=shortest[a]' -map "[v]" -map "[a]" \
-pass 2 -c:v libx264 -c:a libmp3lame -pix_fmt yuv420p -preset ultrafast -shortest \
-movflags +faststart -y \
/var/www/html/Userfiles/Users/blaze/example/earl4x/scene2.mp4