Posts: 7
Threads: 1
Joined: Aug 2018
Sure, I also noticed that in stream 0:0, the original has
25 fps, 25 tbr, 2500 tbn, 50 tbc (default)
Where as the file I output is:
25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
Why is the tbn so wildly different, and can I hard set it somewhere?
Kind regards.
Posts: 10.618
Threads: 57
Joined: May 2017
05.08.2018, 18:22
(This post was last modified: 05.08.2018, 18:23 by Selur.)
Quote:tbn = the time base in AVStream that has come from the container
tbc = the time base in AVCodecContext for the codec used for a particular stream
tbr = tbr is guessed from the video stream and is the value users want to see when they look for the video frame rate
source:
http://www.ffmpeg-archive.org/What-does-...41538.html
Before you mentioned:
Quote:The input file is 25fps, but my output file is 26.40fps,...
but:
Quote:25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
would indicate that the output si 25fps not 26.4fps.
-> confused.
That aside you can set the tbn value for mov and mp4 files with 'video_track_timescale', so adding '-video_track_timescale 2500' might help. (hoping that this hasn't changed since the last time I used it
)
Cu Selur
----
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Posts: 7
Threads: 1
Joined: Aug 2018
OK, I got this working, but I cheated
I tried various versions of ffmpeg, and eventually found a working version from last year (3.2.4), which appears to produce the correct file.
The working command was simply:
ffmpeg -y -enable_drefs 1 -use_absolute_path 1 -i "P:/CSI/Test/CSP0002377.mov" -map 0 -c copy "P:/CSI/Test/test22.mov"
The output file is 25fps with no errors on output, tbn also correct.
Thanks for all your help Selur, as always, very helpful and knowledgable.
Kind regards.
