I think most of this has been explained if you could re-read what has already been written.
To improve accuracy, you can use the two decimal places for the seconds “Length to” in Change Tempo.
As suggested, use Sliding Time Scale if Change Tempo does not give the correct length or the audio does not fill the length correctly. Enter the same percent change that you used for Change Tempo. Enter that percent change in both the “Initial” and “Final” tempo change.
If you make the Hindi audio the same length as the English audio it cannot drift from the video once the delay has been set, unless the Hindi DVD is a different length to the English BluRay. 15 minutes shorter for Hindi audio is an excessive difference, which makes me think there is something wrong with that Hindi audio, or the Hindi DVD is a shorter version of the film.
If the Hindi audio is synchronised in the DVD, why not simply watch the DVD or burn that Hindi DVD to BluRay?
As I asked before, what post? A post in this Forum?
This has already been explained. You cannot specify channel assignments in Audacity, only move tracks up and down if the exported channel order is not played correctly by the audio player. Click and drag above Mute / Solo to move tracks up or down.
AAC channel order is specified as FC , FL , FR , SL , SR , LFE .
AC3 channel order is not specified but the decoder usually enforces FL , FC , FR , SL , SR , LFE .
There is no such thing as “0 kbps” in a valid audio stream.
Encoding the audio in a lossy format will add silence at the start, which you can adjust using the delay setting in the video player or encoder. Changing the encoding quality or kbps will not further change the length.
Gale