[FFmpeg-user] HLS master manifest not displaying the CODEC attribute

[aarthi priya]

Hi all,

I am trying to transcode and package a video to HLS using ffmpeg. I tried
it in 2 ways.
1. Transcode and package in a single step
command: ./ffmpeg -i input.mov -vframes 500 -c:v libx264 -g 50
-x264-params
keyint=50:scenecut=0:bitrate=1200:vbv-maxrate=2000:vbv-bufsize=2000 -c:a
aac -profile:a aac_low -ac 2 -b:a 64 -f hls -hls_time 2 -hls_playlist_type
vod -muxdelay 0 -hls_segment_filename 'out/Layer1_%v/seg-%03d.ts'
-master_pl_name
'master.m3u8' out/index.m3u8

2. Tanscode to mp4 output and package mp4 to HLS as a separate process.
command: ./ffmpeg -i input.mov -vframes 500 -c:v libx264 -g 50
-x264-params
keyint=50:scenecut=0:bitrate=1200:vbv-maxrate=2000:vbv-bufsize=2000 -c:a
aac -profile:a aac_low -ac 2 -b:a 64 out.mp4
./ffmpeg -i out.mp4 -c copy -f hls -hls_time 2 -hls_playlist_type vod
-muxdelay 0 -hls_segment_filename 'out/Layer1_%v/seg-%03d.ts' -master_pl_name
'master.m3u8' out/index.m3u8

#1 is working fine - no problem
#2 - Here the Codec attribute string is not getting printed in the master
manifest. When looking into the code, I saw that the
AVStream->codecpar->extradata is populated different and doesnt follow the
expected condition of *(data[0] | data[1] | data[2]) == 0 && data[3] == 1
&& (data[4] & 0x1F) == 7) - this is in hlsenc.*c:write_codec_attr()

I want to understand why it gets populated differently. Also, for my use
case, encoding and packaging needs to be different steps. So, how can I get
the codec id printed in the master manifest for #2 method.

regards
Aarthi
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