[FFmpeg-user] Copying time stamp metadata

Abhinav Kashyap akashya at gmail.com
Wed Jul 25 06:06:42 EEST 2018

Replying back to myself.

I am still not sure if copy is the correct approach or map ? Any
suggestions ?

On Mon, Jul 23, 2018 at 10:56 AM, Abhinav Kashyap <akashya at gmail.com> wrote:

> Hello,
> I am trying to find out how can I copy timestamp related metadata from a
> file to another ?
> My input file has UNIX timestamp (start time)  which is what i need to
> copy. Here is what I am doing or have tried:
> 1) Read a video file frame by frame in OpenCV
> 2) Modify frames (image processing such as Gaussian blurring or sharpening)
> 3) Write back frames in a video using openCV. Written file has a start
> time of 0.00 ms.
> 4) Copy metadata from original file to modified file using below command :
>    a) ffmpeg -i input.mkv -c copy -movflags +faststart output.mkv - This
> copies bunch of metadata but not the start time which is what I am after.
>    b) fmpeg -i input.mkv -copyts -movflags +faststart output.mkv - This
> copies the video content as with all metadata including the start time.
> Any ideas how can I copy just the start time from originial file to
> modified file ?
> Thanks,
> Abhi

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