[x264-devel] Get MV during the x264 encoding process

[孫偉程]

Hi x264 developers,

I want to get the Motion Vector(MV) during x264 encodes the video. After
tracing the source code, I felt this line(*) in encoder\analyse.c could be
the thing I want. For validation, I generated a video with one black dot
moving from top left to top right on a pure white background. After that, I
get the raw video and encoded it with x264. When I get the printed MV
values(**), it doesn't make sense. Can somebody shed some light on what is
going on? I want to get the MVs just after the motion estimation during the
x264 encoding process.

The following three steps are the command I executed in the experiment.

1. ffmpeg -pattern_type glob -i '*.jpg' dot_move.mp4
2. ffmpeg -i dot_move.mp4 dot_move.yuv
3. ./x264 --log-level debug --input-res 64x64 -b 0 --partitions none --ref
1 -o /path/to/the/video/dot_move.264 /path/to/the/video/dot_move.yuv

Here(***) are the pictures and generated video I used for the experiment.
Thank you!

*:
https://gist.github.com/dmvictor/8d60eac9962fb762c74128f18fa57ec8#file-analyse-c-L40
**: https://gist.github.com/dmvictor/cb4f33c6296ce6d49e74ce5f991b8946
***:
https://drive.google.com/drive/folders/19a3p7pPoUXx_31eU5zzGGilIo-miwfEe?usp=sharing
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