I'll ask on the ffmpeg email list, but in the meantime here's another option that will work:ġ. If an ffmpeg fundi could confirm this it would be great.ĮDIT: It turns out that my ffmpeg command line for delaying audio doesn't work for MKV either, so I'm probably doing something wrong. I suspect ffmpeg can do the latter in a single command line because it provides a null audio source filter, but my experience of its use doesn't extend to timeline editing. So the solution (as from that thread) is to mux in a delay in a container format like MKV, or when outputing to MP4 to physically move audio on the timeline, effectively padding with silence. I quickly tried an offset MP4 remux with ffmpeg now and not one of my players respected the offset.
There was a recent thread (here or on ) that concluded as I recall that most players don't (properly) obey timestamp offsets in the MP4 container format. You can do it with MMG (part of MkvToolNix) if you can live with an MKV file. Just remux with a ~120000 ms audio delay. Thanks for any help anyone can offer - I'm a total 'noob' at this kind of thing. Is there a simple to use (and free!) tool (which works under Windows 7) out there which will allow me to manually sync the audio to the video? Something which will allow me to view/hear both simultaneously and perhaps move a few sliders/timer settings to manually sync them up? Then of course I need to dump them to one file (.mp4. mp3, but I have to work with what I've got! They seem like strange file format selections to me - I would have assumed that they would be. MP4 file (this is how the owner supplied it) and the audio is just a.
As I'm the only one in the family with a modicum of computer knowledge I have been given a very old home video that has been digitised and the audio which has also been digitised - unfortunately approximately the first 2 minutes of the audio are missing so I'm going to have to leave the first two minutes of the video silent which isn't a major problem.
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