[BUG] Interlaced files encoded lossless, muxed with mencoder in AVI, are 10% shorter

[Selur]

I tried to reproduce it by:
Using an interlaced MPEG-2 file, passing through the audio and reencoding the video to FFV-1 interlaced.
Remuxing the output once with mencoder, once with FFmpeg.
Content was identical of both files.

I then used an m2ts with interlaced avc content, passing through the audio and reencoding the video to FFV-1 interlaced.
Remuxing the output once with mencoder, once with FFmpeg.
Now I got the same result as you, the mencoder file seems to be missing frames.

=> I can reproduce the issue, I'm looking into it some more.

Cu Selur