[FFmpeg-user] Stream blocks when system time changes

LANGLOIS Olivier PIS -EXT olivier.pis.langlois at transport.alstom.com
Mon Apr 14 20:21:22 CEST 2014

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Massimo Battistel
> Sent: Monday, April 14, 2014 1:53 PM
> To: FFmpeg user questions
> Subject: [FFmpeg-user] Stream blocks when system time changes
> hello,
> with the following command line you generate a stream to localhost:
> ffmpeg -re -i "anyvideo" -vcodec libx264 -pix_fmt yuv420p -b:v 1M  -acodec
> libvo_aacenc -b:a 64k -ac 2 -ar 48000 -f mpegts udp://
> Open the previous stream with VLC, then put system clock 1 minute back.
> Stream will block almost immediately.
> I would like to know if it is possible to tell ffmpeg to use a different clock
> reference or if there are workarounds for this issue.
> This was just an example, the real case is daylight saving time (and I can't
> disable it).
> Thanks,
> MB

Hi Massimo,

I am currently doing some work to propose to ffmpeg dev to robustify the project in that aspect. I can point you out where to fetch v1 of my patch if you want to try it out in your setup but before I have 2 questions.

1. On which platform are you running ffmpeg (my patch only address the issue on Linux)?
2. Would you be able to send the stream on a different machine (in order be sure that the freeze is in ffmpeg and not in the player...)?

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