我试图流媒体视频，我想选择 Program 2 在此命令行中 ffmpeg. 如何做到这一点？
Input #0, hls, from 'https://videodelivery.net/d0b94c4c5e737af01ff8f6a56e5fc1aa/manifest/video.m3u8':
Duration: 00:34:11.80, start: 0.062089, bitrate: N/A
Program 0
Metadata:
variant_bitrate : 400000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment : eng
Stream #0:1: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 426x240 [SAR 640:639 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 400000
Program 1
Metadata:
variant_bitrate : 800000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment : eng
Stream #0:2: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 800000
Program 2
Metadata:
variant_bitrate : 1800000
Stream #0:0(en): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 4 kb/s (default)
Metadata:
variant_bitrate : 5200000
comment : eng
Stream #0:3: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 854x480 [SAR 1280:1281 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
Metadata:
variant_bitrate : 1800000