使用ffmpeg 一個進程切出 多路分辨率 hls流

    請尊重分享成果，轉載請註明出處，本文來自資州小王，原文鏈接：
https://blog.csdn.net/wlj1012/article/details/105429524

 

項目需要將視頻轉碼，並支持不同分辨率的hls流， 但是單獨一個個切實在是費時，所以測試了ffmpeg的多路輸出。找到下面的參數配置，僅供參考。

1. 方法一， h265

ffmpeg -threads 2 -re -fflags +genpts -i "D:\Program Files\nginx-1.8.1\html\zizhong.mp4" 
-c:v:0 libx265 -s:0 1920x1080 -profile:v:0 main -c:a:0 aac -ac 2 -b:v:0 2000k -b:a:0 128k -maxrate:0 2000k -bufsize:0 4000k -r 24 -ar 44100 -g 48 
-c:v:1 libx265 -s:2 1280x720 -profile:v:1 main -c:a:0 aac -ac 2 -b:v:1 1000k -b:a:1 128k -maxrate:2 1000k -bufsize:2 2000k -r 24 -ar 44100 -g 48 
-c:v:2 libx265 -s:4 720x480 -profile:v:2 main -c:a:0 aac -ac 2 -b:v:2 600k -b:a:2 128k -maxrate:4 600k -bufsize:4 1000k -r 24 -ar 44100 -g 48 
-map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" -hls_segment_type mpegts 
-hls_enc 1 -hls_enc_key 0123456789ABCDEF0123456789ABCDEF -hls_enc_key_url "123456.key" -start_number 10 -hls_time 10 -hls_list_size 0 
-hls_start_number_source 1 -master_pl_name "index.m3u8" 
-hls_segment_filename "D:\Program Files\nginx-1.8.1\html\index_%v-%09d.ts" "D:\Program Files\nginx-1.8.1\html\index_%v.m3u8"

需要注意的是 -s 指定不同分辨率，  實測有效值是 -s:0, -s:2, -s:4。

上面的參數將 MP4文件轉碼成 3路h265 的hls 加密流， 分辨率分別爲 1080P, 720P， NTSC。

生成master playlist ，如下

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=2340800,RESOLUTION=1920x1080
index_0.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=1240800,RESOLUTION=1280x720
index_1.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=800800,RESOLUTION=720x480
index_2.m3u8

2. 方法二 ， h264

ffmpeg -threads 2 -re -fflags +genpts -i "D:\Program Files\nginx-1.8.1\html\zizhong.mp4" 
-s:0 1920x1080 -ac 2 -vcodec libx264 -profile:v main -b:v:0 2000k -maxrate:0 2000k -bufsize:0 4000k -r 30 -ar 44100 -g 48 -c:a aac -b:a:0 128k 
-s:2 1280x720 -ac 2 -vcodec libx264 -profile:v main -b:v:1 1000k -maxrate:2 1000k -bufsize:2 2000k -r 30 -ar 44100 -g 48 -c:a aac -b:a:1 128k 
-s:4 720x480 -ac 2 -vcodec libx264 -profile:v main -b:v:2 600k -maxrate:4 600k -bufsize:4 1000k -r 30 -ar 44100 -g 48 -c:a aac -b:a:2 128k 
-map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a -f hls -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" 
-hls_segment_type mpegts -hls_enc 1 -hls_enc_key 0123456789ABCDEF0123456789ABCDEF -hls_enc_key_url "123456.key" 
-start_number 10 -hls_time 10 -hls_list_size 0 -hls_start_number_source 1 -master_pl_name "index.m3u8" -hls_segment_filename 
"D:\Program Files\nginx-1.8.1\html\index_%v-%09d.ts" "D:\Program Files\nginx-1.8.1\html\index_%v.m3u8"

和方法一沒啥區別， 生成的master playlist如下，

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=2340800,RESOLUTION=1920x1080,CODECS="avc1.4d4028,mp4a.40.2"
index_0.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=1240800,RESOLUTION=1280x720,CODECS="avc1.4d401f,mp4a.40.2"
index_1.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=800800,RESOLUTION=720x480,CODECS="avc1.4d401e,mp4a.40.2"
index_2.m3u8