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I used to use -vsync -1 to Auto Sync a Audio and Video input stream using the -copy switch as they would get out of sync at times and sometimes not so can't specify any seconds for a delay setting but I am getting this message now -vsync deprecated, use -fps_mode but I can't find any information on this new -fps_mode switch. Does anyone know how to use it to Auto Sync an Audio and Video stream? I'm running it in Windows, Thanks

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    Look for fps_mode in FFmpeg Documentation. It looks like -fps_mode -1 is the same as -vsync -1. auto (-1) - Chooses between cfr and vfr depending on muxer capabilities. This is the default method.. Note that -vsync is deprecated, but we can still use it. Commented Nov 13, 2023 at 16:14
  • Got it, Thank you Commented Nov 13, 2023 at 17:18
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    Hello, I'm using "-fps_mode auto" but the stream will still get out of sync after a few days. Is the word auto in the Document just explaining what -1 does? So my command should be -fps_mode -1 instead of -fps_mode auto? When I use -1 I get the error: Invalid value -1 specified for fps_mode of #0:0. What does it mean Stream Specifier? -fps_mode[:stream_specifier] parameter (output,per-stream) Commented Mar 8, 2024 at 14:41
  • If it's getting out of sync after a few days, my guess it that is unrelated to fps_mode (but I don't have any experience with videos that takes days). Try vfr and passthrough... The stream_specifier is relevant in cases where there is more than one video stream - it allows us to define different fps_mode for each video stream. -fps_mode:0:v applies the video from the first input file. -fps_mode:1:v applies the second input file... -fps_mode:0:v:0 applies the first video stream of the first input file -fps_mode:0:v:1 applies the second video stream of the first input file... Commented Mar 8, 2024 at 21:32
  • Can you use fps_mode when transcoding video and audio? I was upgrading old code to new ffmpeg, and when trying to use fps_mode before or after the input it always complain about invalid value 0 specified Commented Apr 29, 2024 at 9:55

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