Opened 7 years ago

Closed 7 years ago

Last modified 7 years ago

#4400 closed defect (fixed)

Problems switching bit depth in input file

Reported by: electron.rotoscope Owned by:
Priority: important Component: avcodec
Version: git-master Keywords: dnxhd regression
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


Some editing systems such as Avid Media Composer will routinely create quicktime files that have some frames yuv422p and some frames yuv422p10le in the same file. When ffmpeg tries to encode video from these files it creates different glitches depending on unknown factors, but usually the result is not clean video.
Sample source file with on-screen text showing the changing bit depth available at and without onscreen text at

% ffmpeg.exe -i D:\ -pix_fmt yuv420p -vcodec libx264 -crf 24 -an D:\outvid.mp4
ffmpeg version N-71102-g1f5d1ee
built on 2015-03-28

Sample encode loglevel sandard
Sample encode loglevel debug

Change History (3)

comment:1 by electron.rotoscope, 7 years ago

I don't know if this pastebin is any different but it's -v 9 -loglevel 99

Sorry about the double-upload, browser malfunction.
Also I should note the errors always seem to be at the point of switchover

Last edited 7 years ago by electron.rotoscope (previous) (diff)

comment:2 by Carl Eugen Hoyos, 7 years ago

Component: undeterminedavcodec
Keywords: dnxhd regression added
Priority: normalimportant
Reproduced by developer: set
Resolution: fixed
Status: newclosed
Version: unspecifiedgit-master

Regression since 64e7cf12 - should be fixed in dcac15a8
Thank you for the report!

For future tickets: Please do not use external resources (like pastebin), always post all necessary information here on the bug tracker. Please do not upload output files, this nearly always leads to confusion, just write that the issue is a regression (worked with version xyz).

comment:3 by electron.rotoscope, 7 years ago

I'll keep that in mind, thank you! Wow this will really help, I wish I'd reported it sooner!
I actually didn't know that it ever worked properly, I've never tried it in an ffmpeg that didn't have an error at the switchover point.

Note: See TracTickets for help on using tickets.