FFMPEG MP4 to HLS Conversion.md

Direct copy of pre-encoded file:

$ ffmpeg -i filename.mp4 -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls filename.m3u8

what is main benefit of to use m3u8 instead of mp4?

In short: If you need to ask, there won't be any.

In long: m3u8 is a HLS Index and widely used for streaming. E.g. transfering the least data possible to provide what is necessary for playback. Though I really do not understand how you didn't get that as literally a first google result... - https://en.wikipedia.org/wiki/HTTP_Live_Streaming

man ..this code is amaizing..i can do both hls to mp4 and reverse.Thanks much

-codec: copy this is a very fast .but -hls_time not working. default every ts file time always it's 8s. how to do can change ts time, for example 4s or shorter time.

-codec: copy this is a very fast .but -hls_time not working. default every ts file time always it's 8s. how to do can change ts time, for example 4s or shorter time.

... https://ffmpeg.org/ffmpeg-formats.html#hls-2

Please, just read the docs? It's not that hard.

PS: 2s is the default value. Just as a heads up. Aka if you want 2s, don't specify hls_time. See 4.17.1 in the docs.

-codec: copy this is a very fast .but -hls_time not working. default every ts file time always it's 8s. how to do can change ts time, for example 4s or shorter time.

... https://ffmpeg.org/ffmpeg-formats.html#hls-2

Please, just read the docs? It's not that hard.

sorry.I read already.But still no answer why -hls_time 2 not work. this is my command.

ffmpeg -i file.mp4 -codec: copy -start_number 0 -hls_time 4 -hls_list_size 0 -f hls m3u8/file.m3u8.
but in the m3u8 file always is #EXTINF:8.341667. then I try
ffmpeg -i file.mp4 -force_key_frames "expr:gte(t,n_forced*4)" -codec: copy -start_number 0 -hls_time 4 -hls_list_size 0 -f hls m3u8/file.m3u8.
Same result.

then I use other command.
ffmpeg -i file.mp4 -codec: copy -map 0 -f segment -segment_list file.m3u8 -segment_time 00:00:04 file%03d.ts.
in the m3u8 file also is #EXTINF:8.341667. this -segment_time 00:00:04 also not work.

but when I not use -codec: copy this command can work normal.
ffmpeg -i file.mp4 -start_number 0 -hls_time 4 -hls_list_size 0 -f hls m3u8/file.m3u8. or
ffmpeg -i file.mp4 -map 0 -f segment -segment_list file.m3u8 -segment_time 00:00:04 file%03d.ts.
in the m3u8 file #EXTINF:4.004000. time change already. but it's very slow not with -codec: copy.

I don't why -codec: copy can't use -segment_time or -hls_time?
if anyone have answer plases tell me.

Well, what is your file's codec? :D

-c copy is fast and (oftentimes) lossless because you aren't remuxing. That's pretty much the entire point. To quote

The video streams can be encoded in the MPEG-1, MPEG-2, MPEG-4 and H. 264/AVC standards. The audio streams can be (HE)-AAC, MPEG-1 Audio Layer 1-2-3, CELP, TwinVQ, Vorbis or Apple Lossless.

Note: it's missing H.265/HEVC. On first glance. Some codecs actually are segmented already. Hence you'd have to remux if you want to change the segmentation time.

Thanks for good experience.

After conversion, It works good in Safari , but not in Chrome.

Is this Chrome's bug ?

Try making it explicit [1]/specifying -hls_time 2s ? Note: that shouldn't actually be required. Additionally - which ffmpeg version are you using? [1]: See https://ffmpeg.org/ffmpeg-utils.html#time-duration-syntax

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On July 7, 2022 6:53:52 AM UTC, ahbao ***@***.***> wrote: > > -codec: copy this is a very fast .but -hls_time not working. default every ts file time always it's 8s. how to do can change ts time, for example 4s or shorter time. > > ... https://ffmpeg.org/ffmpeg-formats.html#hls-2 > > Please, just read the docs? It's not that hard. sorry.I read already.But still no answer why -hls_time 2 not work. ffmpeg -i file.mp4 -codec: copy -start_number 0 -hls_time 2 -hls_list_size 0 -f hls m3u8/file.m3u8. in the m3u8 file always is #EXTINF:8.341667. then I try -- Reply to this email directly or view it on GitHub: https://gist.github.com/4d27678c72580aeb660c19a6fb73e9ee#gistcomment-4223886 You are receiving this because you commented. Message ID: <lukebussey/FFMPEG MP4 to HLS ***@***.***>

how to make any m3u8 source use to own m3u8 make

Thanx!

Doesn't work with a HEVC unfortunately - audio only, no video

Great for me

I can't imagine developer burden without FFMPEG