HLS module master playlist does not generate properly

[oachler]

Summary of the bug:

When generating an m3u8 master playlist from certain files, the video channel is not generated even though the video m3u8 is generated and works correctly.

Files that can have their codecs copied will not generate the proper master playlist. Files that have recompression (not copy) work correctly

How to reproduce:

% ffmpeg -i "H264File.mkv" \
 -bsf:v h264_mp4toannexb -vcodec copy \
 -acodec copy \
 -map 0:v:0 \
 -map 0:a:0 \
 -map 0:s:0 \
 -f hls \
 -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
 -master_pl_name TP41aAaA0.m3u8 \
 -hls_list_size 0 \
 -hls_base_url /cache/ \
 -hls_time 10 \
 TP41aAaA0.m3u8.video.m3u8
ffmpeg version 5.5.1 (and others)

Output (incorrect):
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="TP41aAaA0.m3u8.video_vtt.m3u8"

Working command line:

% ffmpeg -i "H264File.mkv" \
-bsf:v h264_mp4toannexb \
-vcodec libx264 \
-acodec aac \
-af "pan=stereo|FL< 1.0*FL + 0.707*FC + 0.707*BL|FR< 1.0*FR + 0.707*FC + 0.707*BR" \
-map 0:v:0 \
-map 0:a:0 \
-map 0:s:0 \
-var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
-master_pl_name TP41aAaA0.m3u8 \
-hls_list_size 0 -hls_base_url /cache/ -hls_time 10 \
-f hls \
TP41aAaA0.m3u8.video.m3u8

Output (correct):
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="TP41aAaA0.m3u8.video_vtt.m3u8"
#EXT-X-STREAM-INF:BANDWIDTH=140800,RESOLUTION=720x404,CODECS="avc1.64001e,mp4a.40.2",SUBTITLES="subtitle"
TP41aAaA0.m3u8.video.m3u8