[FFmpeg-user] Wrong TC read with doubled Framenumber read out when input is 50p

[Björn Büchel]

Hi Bouke, 
Thanks for the reply. You are right, that makes no sense. But this is what I found out. 
I checked the TC with Avid Media Composer as well as with Resolve and Premiere. 
In all three Apps the TC is identical. 
Björn 


—-

Björn Büchel
Am Hüpplingsgraben 5
42799 Leichlingen
0152 / 051 051 00
bjoernbuechel at me.com


> Am 06.11.2022 um 11:10 schrieb Bouke / Videotoolshed <bouke at videotoolshed.com>:
> 
> 
>> 
>> On 6 Nov 2022, at 08:42, Björn Büchel via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
>> 
>> Hi, when I pass a 50p h264 or h265 Video to "ffmpeg -i" without any further code the console shows the "TC In" of the Video. But the Frame coloumn of the File is doubled so the output has the wrong TC. 
>> e.g. 
>> orginial File TC: 10:00:00:05    
>> ffmpeg -i shows: 10:00:00:10
>> 
>> or e.g. 
>> orginial File TC: 10:00:00:45    
>> ffmpeg -i shows: 10:00:01:40
>> 
>> Is this a known issue or does anyone have a workaround?
> 
> This I’ve never seen. I know that the TC is written as frames in Mov, Mp4 and MXF, so you need the frame rate to convert to HH MM SS FF
> This sometimes goes wrong, so different apps calculate different TC values, but that is always the entire number doubled / halved.
> In your case only the frames are doubled, this makes no sense, a frames to tc routine will not use a different FPS for hours / minutes / seconds and frames.
> 
> When you say ‘original File TC’, what makes you so sure that is indeed correct? What software tells you that? Did you try other apps? (Resolve / Premiere / Avid / Quicktime player / whatever you have.)
> 
> Bouke
> 
> 
>> I would appreciate your help. 
>> Björn
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