如何使用ffmpeg创建HLS主播放列表？

Question

有一个命令可以生成不同大小的hls视频。现在我需要把它们合并成一个主播放列表。(什么是主播放列表？)我该怎么做？我需要在这个命令中添加什么和添加到什么位置？

ffmpeg -hide_banner -y -i input.mp4 \
  -vf scale=w=640:h=360:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod  -b:v 800k -maxrate 856k -bufsize 1200k -b:a 96k -hls_segment_filename output/360p_%03d.ts output/360p.m3u8 \
  -vf scale=w=842:h=480:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 1400k -maxrate 1498k -bufsize 2100k -b:a 128k -hls_segment_filename output/480p_%03d.ts output/480p.m3u8 \
  -vf scale=w=1280:h=720:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 2800k -maxrate 2996k -bufsize 4200k -b:a 128k -hls_segment_filename output/720p_%03d.ts output/720p.m3u8 \
  -vf scale=w=1920:h=1080:force_original_aspect_ratio=decrease -c:a aac -ar 48000 -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type vod -b:v 5000k -maxrate 5350k -bufsize 7500k -b:a 192k -hls_segment_filename output/1080p_%03d.ts output/1080p.m3u8

我感兴趣的是在此命令中使用ffmpeg自动创建主播放列表。

UPD:我回答了我自己的问题

经过几次尝试，我还是得到了想要的结果。我修改了命令，现在看起来如下

ffmpeg -hide_banner -re -i input.mp4 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 \
  -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -c:a aac -ar 48000 \
  -filter:v:0 scale=w=640:h=360:force_original_aspect_ratio=decrease -maxrate:v:0 856k -bufsize:v:0 1200k -b:a:0 96k \
  -filter:v:1 scale=w=842:h=480:force_original_aspect_ratio=decrease -maxrate:v:1 1498k -bufsize:v:1 2100k -b:a:1 128k \
  -filter:v:2 scale=w=1280:h=720:force_original_aspect_ratio=decrease -maxrate:v:2 2996k -bufsize:v:2 4200k -b:a:2 128k \
  -filter:v:3 scale=w=1920:h=1080:force_original_aspect_ratio=decrease -maxrate:v:3 5350k -bufsize:v:3 7500k -b:a:3 192k \
  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3" \
  -hls_time 4 \
  -hls_list_size 0 \
  -master_pl_name master.m3u8 \
  -hls_segment_filename output/%v_%03d.ts output/%v.m3u8

Answer 1

经过几次尝试，我还是得到了想要的结果。我修改了命令，现在看起来如下

ffmpeg -hide_banner -re -i input.mp4 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 \
  -c:v h264 -profile:v main -crf 20 -sc_threshold 0 -g 48 -keyint_min 48 -c:a aac -ar 48000 \
  -filter:v:0 scale=w=640:h=360:force_original_aspect_ratio=decrease -maxrate:v:0 856k -bufsize:v:0 1200k -b:a:0 96k \
  -filter:v:1 scale=w=842:h=480:force_original_aspect_ratio=decrease -maxrate:v:1 1498k -bufsize:v:1 2100k -b:a:1 128k \
  -filter:v:2 scale=w=1280:h=720:force_original_aspect_ratio=decrease -maxrate:v:2 2996k -bufsize:v:2 4200k -b:a:2 128k \
  -filter:v:3 scale=w=1920:h=1080:force_original_aspect_ratio=decrease -maxrate:v:3 5350k -bufsize:v:3 7500k -b:a:3 192k \
  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3" \
  -hls_time 4 \
  -master_pl_name master.m3u8 \
  -hls_segment_filename output/%v_%03d.ts output/%v.m3u8