[FFmpeg-user] Start offset changes with ts file

[m.kamalasubha m.kamalasubha]

Hello guys,
    I converted a video file from MP4 format to TS format using the
following ffmpeg command.
   * ffmpeg -i <input.mp4> -c copy -bsf h264_mp4toannexb <output.ts>*
    => simply copies the A/V data from .mp4 to .ts

    Simple copy operation from .mp4 -> .ts introduces *"start: 1.441667" in
<output.ts>* whereas <input.mp4> contains "start: 0.000000".

     I find this extra 1.4 seconds getting added to start metadata in all
.ts files generated using ffmpeg command. My questions are
1) Why is it added ?
2) How to retain  "start: 0.000000" in <output.ts> ?

Thanks in advance.