New submission from killerwake <[email protected]>:

i'm trying to use ffmpeg for transcoding 1 rtmp stream 
on the fly but it freezes the image for 1-2 seconds 
when ffmpeg duplicate frames to sync audio and sound

ffmpeg -i rtmp://localhost:1935/test/live_1 -re -s 
176x144 -acodec libfaac -vcodec libx264 -ac 1 -ab 32k -
b 100k -vpre libx264-ultrafast_firstpass -r 13 -b 68k -
async 1 -sync 1 -f flv rtmp://localhost:1935/test/live_2

frame= 5832 fps= 13 q=24.0 size=    5916kB time=448.45 
bitrate= 108.1kbits/s dup=126 drop=5447

when dup frames increase the image freezes for 1-2 
seconds.

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messages: 12611
priority: normal
status: new
substatus: new
title: RTMP Transcoding
type: bug

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FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue2372>
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