I have a video of 3.34 gb and I found that its audio was not at the correct duration, so I adjusted the audio and rendered it with the same quality as the original one but found that after it has been rendered it becomes of 52.6 gb, which is nearly about 13 times the original one. Nothing else was done rather then adjusting the audio's place. Pls tell hw to render with original size.

Hi, take a look to this: viewtopic.php?f=265&t=172017&p=447513&hilit=mediainfo#p447513

Hi there,
filesize corresponds to bitrate. If you rendered to the same quality, you may want to check especially the video bitrate of the source and rendered video by using ffprobe <file>. The bitrate of the shortened video will be much higher (approx. 11-12 times).

If you want to render close to the old filesize, set the video and audio bitrate in the render dialog manually to those of the original.

If you want to shorten the audio track without re-rendering (and so losslessly) you can use ffmpeg to

a) demux the clip
b) cut the audio track file to the correct length (https://trac.ffmpeg.org/wiki/Seeking)
c) mux audio and video together again.

Good luck