[FFmpeg-trac] #5388(avformat:new): Audio Stream Specifier Need to Change for MP2 & MP3

FFmpeg trac at avcodec.org
Wed Mar 30 14:21:10 CEST 2016

#5388: Audio Stream Specifier Need to Change for MP2 & MP3
             Reporter:  smallishzulu  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avformat
              Version:  git-master    |               Resolution:
             Keywords:  mpegts        |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |

Comment (by smallishzulu):

 Simple; when I encode with below command line;

 ffmpeg -i input.ts -vcodec mpeg2video -vb 2500k -acodec mp2 -ab 128k
 -muxrate 3000k -f mpegts output.ts

 Audio Specifier is 0x03 and when I playout the TS file in SD STBs most of
 them is OK. But 2 STBs;

 a) Pace SD STBs has no audio.
 b) Vestel 9200 STBs has audio decode delay.

 If I change stream specifier to 0x04, these STBs also play audio

 I discussed this issue with manufacturer engineers and learned that they
 define decoding codec based on specifier, so it cause problem with MPEG 1
 audio decoder via 0x03. When 0x04 is set, MPEG 2 Audio decoder is set and
 no problems occured.

 Thats the all story.

Ticket URL: <https://trac.ffmpeg.org/ticket/5388#comment:8>
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