[FFmpeg-user] HTTP playlist stream copy to an IP QAM modulator
reuben.m at gmail.com
Wed Jul 20 06:56:00 EEST 2016
On Tuesday, July 19, 2016 10:16:03 PM CDT Anacelia Sarlo wrote:
> ffmpeg -re -y -i $stream -c copy -f mpegts -map 0:0 -map 0:1
> -mpegts_pmt_start_pid 66 -streamid 1:71 -streamid 0:70 udp://
> When I watch the stream from the cable network, the audio is OK but the
> video looks sometimes faltering and other times too fast, and out of sync.
> But when I received this same output with ffplay it runs OK.
> It seems there is a problem with the time base, I did many testings with
> (genpts, copyts, etc) with no good results.
You might try and see what happens if you re-encode it rather than copying the
media streams. Thing is with copying the stream you pass on any flaws that
might be able to be corrected by ffmpeg, but are not as gracefully dealt with
by other implementations.
At least that might help narrow the problem down a bit and determine if the
problem is with the origional source, or with ffmpeg.
It would be nice to have a bit-stream filter to re-write time stamps when
doing a stream copy, but sadly no such filter exists yet.
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