風(fēng)信建站新的開(kāi)發(fā)項(xiàng)目中引用視頻流技術(shù)，為了有效解決大視頻在數(shù)據(jù)請(qǐng)求過(guò)程中加載過(guò)慢的問(wèn)題，經(jīng)過(guò)多次測(cè)試，決定使用m3u8格式做為視頻流的格式，那么mp4和m3u8格式的視頻各有什么缺點(diǎn)和優(yōu)點(diǎn)呢？
mp4視頻格式有以下優(yōu)點(diǎn)：
1：跨平臺(tái)支持，即支持pc端和移動(dòng)端（ios和安卓）。
2：該格式性能優(yōu)越。
mp4視頻的缺點(diǎn)：
1：視頻時(shí)間長(zhǎng)度過(guò)長(zhǎng)時(shí)，在移動(dòng)端會(huì)消耗大量的流量，但隨著互聯(lián)網(wǎng)流量資費(fèi)的發(fā)展（將來(lái)流量是包月/年的，每月交一定費(fèi)用，流量無(wú)限使用。）該缺點(diǎn)將不再存在。
2：視頻文件相對(duì)大一些。對(duì)于服務(wù)器的空間占用方面會(huì)有一定壓力。
視頻本身的要求
1：視頻轉(zhuǎn)碼格式需要是h.264
2：音頻轉(zhuǎn)碼格式需要是AAC
3：如果考慮到需要支持在PC端低版本IE（IE9及以下）的環(huán)境中（在該環(huán)境中只能使用flashplayer播放）支持視頻請(qǐng)求未下載到用戶本地緩存區(qū)的內(nèi)容播放。則需要視頻本身存在關(guān)鍵幀和關(guān)鍵時(shí)間點(diǎn)（服務(wù)器方面也有要求）。
m3u8的優(yōu)點(diǎn)：
1：因?yàn)橐曨l被切成多個(gè).ts文件，所以不需要考慮元數(shù)據(jù)的問(wèn)題，并且可以分段加載。
2：在PC端使用flashplayer播放時(shí)可以實(shí)現(xiàn)視頻的絕對(duì)加密。也就是視頻即使是被下載到用戶本地也無(wú)法使用。
m3u8的缺點(diǎn)
正常情況下不支持PC端的播放。ckplayer做了兼容是支持在pc端播放的，前提是pc端瀏覽器需要支持flashplayer
使用m3u8我們需要將mp4視頻進(jìn)行轉(zhuǎn)碼，命令如下：
ffmpeg -i 2.mp4 -codec copy -vbsf h264_mp4toannexb -map 0 -f segment -segment_list m3u8/2.m3u8 -segment_time 10 m3u8/out%03d.ts
G:\phpstudy_pro\wwwroot\ebiaoip-v\public>ffmpeg -i 2.mp4 -codec copy -vbsf h264_
mp4toannexb -map 0 -f segment -segment_list m3u8/2.m3u8 -segment_time 10 m3u8/ou
t%03d.ts
ffmpeg version n4.3.1-23-gc19641b2e2 Copyright (c) 2000-2020 the FFmpeg develope
rs
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-conf
ig=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw
32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib -
-enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-l
zma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enab
le-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --
enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --ena
ble-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libt
heora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrn
b --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-lib
rubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --en
able-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-l
ibxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --e
xtra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.58.101
Duration: 00:04:10.13, start: 0.000000, bitrate: 161 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x368 [
SAR 1:1 DAR 40:23], 107 kb/s, 20 fps, 20 tbr, 10240 tbn, 80 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt
p, 48 kb/s (default)
Metadata:
handler_name : SoundHandler
[segment @ 00000000004b8d00] Opening 'm3u8/out000.ts' for writing
Output #0, segment, to 'm3u8/out%03d.ts':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.45.100
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x368 [
SAR 1:1 DAR 40:23], q=2-31, 107 kb/s, 20 fps, 20 tbr, 90k tbn, 40 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt
p, 48 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out001.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out002.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out003.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out004.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out005.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out006.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out007.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out008.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out009.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out010.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out011.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out012.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out013.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out014.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out015.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out016.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out017.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out018.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/out019.ts' for writing
[segment @ 00000000004b8d00] Opening 'm3u8/2.m3u8.tmp' for writing
frame= 4996 fps=0.0 q=-1.0 Lsize=N/A time=00:04:10.09 bitrate=N/A speed=1.44e+03
x
video:3274kB audio:1468kB subtitle:0kB other streams:0kB global headers:0kB muxi
ng overhead: unknown
轉(zhuǎn)碼成功之后就可以在播放器中使用，加載速度快多啦！
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