wrong stream size and bitrate of the video track

[HolyGit12]

After encoding with auto-encode the resulting video has the wrong stream size (header). It seems to be the data from the source file.
The video bitrate is also wrong.
I attach what mediainfo is reporting:

General
Format : Matroska
Format version : Version 4
File size : 412 MiB
Duration : 36 min 4 s
Overall bit rate : 1 596 kb/s
Frame rate : 29.970 FPS
Writing application : Lavf61.7.100
Writing library : Lavf61.7.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : AV1
Format/Info : AOMedia Video 1
Format profile : [email protected]
Codec ID : V_AV1
Duration : 36 min 4 s
Bit rate : 4 995 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 0)
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.080
Stream size : 1.26 GiB
Writing library : Lavc61.19.100 libsvtav1
Default : Yes
Forced : No
Color range : Limited

[HolyGit12]

I guess that the wrong data are part of the global (?) tags:

<Simple>
  <Name>BPS</Name>
  <String>4995221</String>
</Simple>
<Simple>
  <Name>NUMBER_OF_FRAMES</Name>
  <String>64878</String>
</Simple>
<Simple>
  <Name>NUMBER_OF_BYTES</Name>
  <String>1351683311</String>
</Simple>

[mr44er]

It seems to be the data from the source file.

Yes, that is the metadata from the source file.

Try this:
ffmpeg -i outputold.mkv -map_metadata -1 -c copy outputnew.mkv

[Dropforged]

@HolyGit12, I had a similar issue. I had my presets defined to preserve/carry forward existing metadata so as not to loose valuable information - at least, that was the idea. So I had the same problem with inaccurate headers (kbps, etc). I took me a while to figure out why it was happening

Much thanks @mr44er , I'll run this against my library. I wasn't going to re-transcode all those sources again before I corrected the issue :)