mirrors/copyparty
1
0
Fork 0
mirror of https://github.com/9001/copyparty.git synced 2025-08-16 08:32:13 -06:00
Code Issues Actions Packages Projects Releases Wiki Activity

add hls notes

Browse source
This commit is contained in:
ed 2021-07-03 01:32:36 +02:00
parent ecead109ab
commit 919bd16437
1 changed files with 51 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

51
docs/hls.html Normal file
View file

@ -0,0 +1,51 @@
<!DOCTYPE html><html lang="en"><head>
<meta charset="utf-8">
<title>hls-test</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
</head><body>
<video id="vid" controls></video>
<script src="hls.light.js"></script>
<script>
var video = document.getElementById('vid');
var hls = new Hls({
debug: true,
autoStartLoad: false
});
hls.loadSource('live/v.m3u8');
hls.attachMedia(video);
hls.on(Hls.Events.MANIFEST_PARSED, function() {
hls.startLoad(0);
});
hls.on(Hls.Events.MEDIA_ATTACHED, function() {
video.muted = true;
video.play();
});
/*
general good news:
- doesn't need fixed-length segments; ok to let x264 pick optimal keyframes and slice on those
- hls.js polls the m3u8 for new segments, scales the duration accordingly, seeking works great
- the sfx will grow by 66 KiB since that's how small hls.js can get, wait thats not good
# vod, creates m3u8 at the end, fixed keyframes, v bad
ffmpeg -hide_banner -threads 0 -flags -global_header -i ..\CowboyBebopMovie-OP1.webm -vf scale=1280:-4,format=yuv420p -ac 2 -c:a libopus -b:a 128k -c:v libx264 -preset slow -crf 24 -maxrate:v 5M -bufsize:v 10M -g 120 -keyint_min 120 -sc_threshold 0 -hls_time 4 -hls_playlist_type vod -hls_segment_filename v%05d.ts v.m3u8
# live, updates m3u8 as it goes, dynamic keyframes, streamable with hls.js
ffmpeg -hide_banner -threads 0 -flags -global_header -i ..\..\CowboyBebopMovie-OP1.webm -vf scale=1280:-4,format=yuv420p -ac 2 -c:a libopus -b:a 128k -c:v libx264 -preset slow -crf 24 -maxrate:v 5M -bufsize:v 10M -f segment -segment_list v.m3u8 -segment_format mpegts -segment_list_flags live v%05d.ts
# fmp4 (fragmented mp4), doesn't work with hls.js, gets duratoin 149:07:51 (536871s), probably the tkhd/mdhd 0xffffffff (timebase 8000? ok)
ffmpeg -re -hide_banner -threads 0 -flags +cgop -i ..\..\CowboyBebopMovie-OP1.webm -vf scale=1280:-4,format=yuv420p -ac 2 -c:a libopus -b:a 128k -c:v libx264 -preset slow -crf 24 -maxrate:v 5M -bufsize:v 10M -f segment -segment_list v.m3u8 -segment_format fmp4 -segment_list_flags live v%05d.mp4
# try 2, works, uses tempfiles for m3u8 updates, good, 6% smaller
ffmpeg -re -hide_banner -threads 0 -flags +cgop -i ..\..\CowboyBebopMovie-OP1.webm -vf scale=1280:-4,format=yuv420p -ac 2 -c:a libopus -b:a 128k -c:v libx264 -preset slow -crf 24 -maxrate:v 5M -bufsize:v 10M -f hls -hls_segment_type fmp4 -hls_list_size 0 -hls_segment_filename v%05d.mp4 v.m3u8
more notes
- adding -hls_flags single_file makes duration wack during playback (for both fmp4 and ts), ok once finalized and refreshed, gives no size reduction anyways
- bebop op has good keyframe spacing for testing hls.js, in particular it hops one seg back and immediately resumes if it hits eof with the explicit hls.startLoad(0); otherwise it jumps into the middle of a seg and becomes art
- can probably -c:v copy most of the time, is there a way to check for cgop? todo
*/
</script>
</body></html>