[FFmpeg-user] why are my streams not aligned?

[gordon]

Why are the segments for my stream not aligned?  The first command outputs
video segment.  The second command outputs an audio segment with the
previous video output copied in.

Ffmpeg commands are pasted below with the m3u8 outputs.  The same results
were observed on ffmpeg 4.2.1 and snapshot

/usr/local/bin/ffmpeg -y -loglevel error -f rawvideo -vcodec rawvideo -s
160x120 -pix_fmt rgb24 -r 12.00 -i - -an -vcodec libx264 -preset medium -f
hls -an -hls_flags single_file -hls_time 6 -hls_list_size 0
-hls_segment_type mpegts -hls_segment_filename
/tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94.ts
-hls_playlist_type vod -master_pl_name
21b79578a1d04533932e32d28f46eb94-master.m3u8 -force_key_frames
'expr:gte(t,n_forced*2)' -profile:v baseline -level 3.0 -pix_fmt yuv420p
-vsync cfr -b 145k -pix_fmt yuv420p
/tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94-variant.m3u8

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:6.000000,
#EXT-X-BYTERANGE:116748 at 0
21b79578a1d04533932e32d28f46eb94.ts
#EXTINF:6.000000,
#EXT-X-BYTERANGE:96256 at 116748
21b79578a1d04533932e32d28f46eb94.ts
#EXTINF:6.000000,
#EXT-X-BYTERANGE:143256 at 213004
21b79578a1d04533932e32d28f46eb94.ts
#EXTINF:6.000000,
#EXT-X-BYTERANGE:97760 at 356260
21b79578a1d04533932e32d28f46eb94.ts
#EXTINF:5.750000,
#EXT-X-BYTERANGE:75764 at 454020
21b79578a1d04533932e32d28f46eb94.ts
#EXT-X-ENDLIST


/usr/local/bin/ffmpeg -y -loglevel error -f s16le -acodec pcm_s16le -ar
44100 -ac 2 -i - -i
/tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94.ts
-vcodec copy -acodec libfdk_aac -ar 44100 -strict -2 -profile:a aac_he_v2
-vbr 1 -f hls -hls_flags single_file -hls_time 6 -hls_list_size 0
-hls_segment_type mpegts -hls_segment_filename
/tmp/973b7b02b6e6486f90d3064527a69701/output/e3658a88388c4d4da25681956bccb00f.ts
-hls_playlist_type vod -master_pl_name
e3658a88388c4d4da25681956bccb00f-master.m3u8 -force_key_frames
'expr:gte(t,n_forced*2)' -pix_fmt yuv420p -vsync cfr
/tmp/973b7b02b6e6486f90d3064527a69701/output/e3658a88388c4d4da25681956bccb00f-variant.m3u8

#EXTM3U
#EXT-X-VERSION:4
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:6.000000,
#EXT-X-BYTERANGE:146452 at 0
e3658a88388c4d4da25681956bccb00f.ts
#EXTINF:6.000000,
#EXT-X-BYTERANGE:125020 at 146452
e3658a88388c4d4da25681956bccb00f.ts
#EXTINF:5.916667,
#EXT-X-BYTERANGE:167320 at 271472
e3658a88388c4d4da25681956bccb00f.ts
#EXTINF:6.083333,
#EXT-X-BYTERANGE:133856 at 438792
e3658a88388c4d4da25681956bccb00f.ts
#EXTINF:5.750000,
#EXT-X-BYTERANGE:103776 at 572648
e3658a88388c4d4da25681956bccb00f.ts
#EXT-X-ENDLIST