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

[Bouke (Edit 'B)]

> On 06 Nov 2022, at 21:35, Björn Büchel via ffmpeg-user <ffmpeg-user at ffmpeg.org> wrote:
> 
> 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 

Hi Björn,
Did you try QTchange as well? (If not, please do, the free demo will do just fine.)
https://www.videotoolshed.com/handcrafted-timecode-tools/qtchange/

It’s partly based on FFmpeg, so it ‘should’ give the same results. 
There are a couple of thousend end users, including some major broadcasters / studios, and I have not have any complaint like you describe…

So, this is strange.

Bouke



> 
> —-
> 
> 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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