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raczek / lavfilters

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25fps plays at twice the frame rate on 4k@30hz display #525

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Describe the issue you're having:
25fps content plays at 45fps and drops alot of frames *half* on 4k@30hz display

How can the issue be reproduced? Sample File?
play a interlaced h264 25fps mkv file on a 3840x2160@30hz display

What version of the product are you using? In which Player?
LAV Video Decoder 0.64 64-bit
MPC-BE 1.4.4 Build 285 64-bit
Native DXVA2 (AMD Radeon HD 7970)

Please provide any additional information below.
i noticed if you disable deinterlacing mode it will stop drop frames like crazy 
and play at correct 25fps rate

mediainfo
Video
ID                             : 1
Format                         : AVC
Format/Info                    : Advanced Video Codec
Format profile                 : High@L4.1
Format settings, CABAC         : Yes
Format settings, ReFrames      : 4 frames
Codec ID                       : V_MPEG4/ISO/AVC
Duration                       : 33mn 16s
Bit rate mode                  : Variable
Maximum bit rate               : 35.0 Mbps
Width                          : 1 920 pixels
Height                         : 1 080 pixels
Display aspect ratio           : 16:9
Frame rate mode                : Constant
Frame rate                     : 25.000 fps
Standard                       : PAL
Color space                    : YUV
Chroma subsampling             : 4:2:0
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                     : Top Field First
Language                       : English
Default                        : No
Forced                         : No
Color primaries                : BT.709
Transfer characteristics       : BT.709
Matrix coefficients            : BT.709
Color range                    : Limited

Audio #1
ID                             : 2
Format                         : FLAC
Format/Info                    : Free Lossless Audio Codec
Codec ID                       : A_FLAC
Duration                       : 33mn 16s
Bit rate mode                  : Variable
Channel(s)                     : 2 channels
Channel positions              : Front: L R
Sampling rate                  : 48.0 KHz
Bit depth                      : 24 bits
Title                          : Stereo
Writing library                : MakeMKV v1.9.1 win(x64-release)
Language                       : English
Default                        : Yes
Forced                         : No

Original issue reported on code.google.com by tomma...@gmail.com on 18 Apr 2015 at 9:13

GoogleCodeExporter commented 9 years ago 
The video is interlaced, which results in 50 fps after deinterlacing. Playing 
that on a 30Hz screen will never be perfect.

That said, LAV has no influence on what the video renderer does.

Original comment by h.lepp...@gmail.com on 18 Apr 2015 at 10:47