actual fps on dvd

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potatis
Posts: 9
Joined: Tue Aug 16, 2011 6:45 pm

actual fps on dvd

Post by potatis » Sat Aug 04, 2018 10:09 am

Description of problem or question:

If a DVD with VIDEO_TS folder shows 29.97 fps in VLC and 23.97 fps after conversion with handbrake, which is correct fps for the film?

rollin_eng
Veteran User
Posts: 2908
Joined: Wed May 04, 2011 11:06 pm

Re: actual fps on dvd

Post by rollin_eng » Sat Aug 04, 2018 10:27 am

Could you please post your HB logs, instructions can be found here:

https://handbrake.fr/docs/en/latest/hel ... y-log.html

potatis
Posts: 9
Joined: Tue Aug 16, 2011 6:45 pm

Re: actual fps on dvd

Post by potatis » Sat Aug 04, 2018 11:18 am

Ok I see now just by opening the file again that Handbrake identifies the source as 23.97 fps. Must be a problem of VLC, so nevermind.

HandBrake Activity Log ***required*** (see How-to get an activity log)

Code: Select all

[13:13:37] macgui: Handbrake Version: 1.1.1  (2018061800)
[13:13:37] hb_init: starting libhb thread
[13:13:37] hb_init: starting libhb thread
[13:13:43] macgui: trying to open a folder or file
[13:13:43] macgui: ScanCore scanning titles with a duration of 10 seconds or more
[13:13:43] CPU: Intel(R) Core(TM) i5-2415M CPU @ 2.30GHz
[13:13:43]  - Intel microarchitecture Sandy Bridge
[13:13:43]  - logical processor count: 4
[13:13:43] hb_scan: path=/Users/potatis/Downloads/Manpower (1941)/VIDEO_TS/VTS_01_1.VOB, title_index=0
udfread ERROR: ECMA 167 Volume Recognition failed
disc.c:323: failed opening UDF image /Users/potatis/Downloads/Manpower (1941)/VIDEO_TS/VTS_01_1.VOB
disc.c:424: error opening file BDMV/index.bdmv
disc.c:424: error opening file BDMV/BACKUP/index.bdmv
[13:13:43] bd: not a bd - trying as a stream/file instead
libdvdnav: Using dvdnav version 5.0.3
libdvdread: Encrypted DVD support unavailable.
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[13:13:43] dvd: not a dvd - trying as a stream/file instead
[13:13:43] file is MPEG Program Stream
[13:13:43] Probing 3 unknown streams
[13:13:43]     Probe: Found stream mpeg2video. stream id 0xe0-0x0
[13:13:43] Found the following streams
[13:13:43]     Video Streams : 
[13:13:43]       0xe0-0x0 type MPEG2 (0x2)
[13:13:43]     Audio Streams : 
[13:13:43]       0xbd-0x80 type AC3 (0x81)
[13:13:43]       0xbd-0x81 type AC3 (0x81)
[13:13:43]     Subtitle Streams : 
[13:13:43]     Other Streams : 
[13:13:43] stream id 0xbd (type 0x81 substream 0x80) audio 0x8000bd
[13:13:43] stream id 0xbd (type 0x81 substream 0x81) audio 0x8100bd
[13:13:43] scan: decoding previews for title 1
[13:13:43] file is MPEG Program Stream
[13:13:43] Probing 3 unknown streams
[13:13:43]     Probe: Found stream mpeg2video. stream id 0xe0-0x0
[13:13:43] scan: audio 0x8000bd: ac3, rate=48000Hz, bitrate=192000 Unknown (AC3) (2.0 ch)
[13:13:43] scan: audio 0x8100bd: ac3, rate=48000Hz, bitrate=192000 Unknown (AC3) (2.0 ch)
[13:13:44] stream: 56 good frames, 0 errors (0%)
[13:13:44] scan: 10 previews, 720x480, 23.976 fps, autocrop = 0/0/0/10, aspect 4:3, PAR 8:9
[13:13:44] libhb: scan thread found 1 valid title(s)
[13:13:44] macgui: ScanCore scan done

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JohnAStebbins
HandBrake Team
Posts: 5218
Joined: Sat Feb 09, 2008 7:21 pm

Re: actual fps on dvd

Post by JohnAStebbins » Sat Aug 04, 2018 2:54 pm

It's not really a "problem" with vlc. It's more of a problem with DVD. The DVD spec only permits 29.97 (NTSC) and 25 fps (PAL). In order to reproduce film framerates for NTSC, they set field repeat flags in the video data that cause some frames to have a longer duration so that the average is 23.97 fps. HandBrake detects these field repeat flags and adjusts the framerate we show accordingly. The framerate is actually variable with some frames being less than 23.97 and some being greater than 23.97. But HandBrake also smooths this unevenness out during conversion.

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