[FFmpeg-user] Error Encoding AAC to HLS Using ffmpeg

[andrei ka]

you don't need groups here, just make a master index.m3u8 with :

index.m3u8 :
#================
#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=128000
index_low.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH= 256000
index_high.m3u8
#================

and

ffmpeg -re  -i aac_file -vn  -filter_complex
"[0:a]volume=6dB,asetrate=sample_rate=48000,split=2[src1][src2] \
-map [src1] -c:a fdk_aac -b:a:0 128k \
-flags -global_header  -hls_segment_filename index_ld_%05d.ts  -timeout 2
-reconnect_delay_max 1 -f hls -hls_time 4 -hls_list_size 8 -hls_flags
delete_segments+append_list+omit_endlist+discont_start+split_by_time
-hls_allow_cache 0 -start_number 1 'index_low.m3u8'  \
  -map [src2] -c:a fdk_aac -b:a:1 256k   \
-flags -global_header   -hls_segment_filename index_sd_%05d.ts  -timeout 2
-reconnect_delay_max 1 -f hls -hls_time 4 -hls_list_size 8 -hls_flags
delete_segments+append_list+omit_endlist+discont_start+split_by_time
-hls_allow_cache 0 -start_number 1 'index_high.m3u8'

i didn't try it, but i do video transcoding in this way, so you may need to
edit this cmdline a bit....

&rei

>ffmpeg -re -i input.aac -b:a:0 128k -af volume=6dB -ar 48000 -hls_time 20
-vn -hls_list_size 0 -b:a:1 256k -af volume=6dB -ar 48000  -hls_time 20 -vn
>-hls_list_size 0     -map 0:a -map 0:a -f hls -var_stream_map
"a:0,agroup:aud_low a:1,agroup:aud_high" -master_pl_name index.m3u8
index_%v.m3u8

On Mon, Dec 2, 2019 at 1:37 PM Ashish Jha <ashish.jha at hoichoi.tv> wrote:

> I want to encode an AAC formatted audio file into multi bitrate HLS using
> ffmpeg:
>
>
> fmpeg -re -i input.aac -b:a:0 128k -af volume=6dB -ar 48000 -hls_time 20
> -vn -hls_list_size 0 -b:a:1 256k -af volume=6dB -ar 48000  -hls_time 20 -vn
> -hls_list_size 0     -map 0:a -map 0:a -f hls -var_stream_map
> "a:0,agroup:aud_low a:1,agroup:aud_high" -master_pl_name index.m3u8
> index_%v.m3u8
>
> This lets me get 1 master manifest and 2 child manifests, which are
> playable on android. However, this does not play on desktop using chrome. I
> found these 2 lines in master manifest that seem to cause the issue. When
> manually removed, it plays perfectly.
>
>
>
> #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_low",NAME="audio_0",DEFAULT=YES,URI="master0.m3u8"
>
> #EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_high",NAME="audio_1",DEFAULT=YES,URI="master1.m3u8"
>
> Is there a way to encode audio in multibitrate that avoids this issue?
>
>
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