I'm looking for a program, that can replace low-quality audio track in video with high-quality one from lossless audio file. It also must be available to shift HQ-track position. I want to do these operations at least with MP4-files. I use Windows 7 64-bit.


You might want to look at VirtualDub.

From its list of video editing features

  • Reads and writes AVI2 (OpenDML) and multi-segment AVI clips.
  • Integrated MPEG-1 and Motion-JPEG decoders.
  • Remove and replace audio tracks without touching the video.
  • Extensive video filter set, including blur, sharpen, emboss, smooth, 3x3 convolution, flip, resize rotate, brightness/contrast, levels, deinterlace, and threshold.
  • Bilinear and bicubic resampling -- no blocky resizes or rotates here.
  • Decompress and recompress both audio and video.
  • Remove segments of a video clip and save the rest, without recompressing.
  • Adjust frame rate, decimate frames, and 3:2 pulldown removal.
  • Preview the results, with live audio.

FFMPEG is able to add and replace audio (and video, subtitle, etc) tracks in files without re-encoding.

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