Muxing interlaced video

[Selur]

Source file options:
Format : MPEG Video
Frame rate : 25.000 FPS
Standard : PAL

Output File Options:
Frame rate mode : Variable
Frame rate : 50.000 FPS
Original frame rate : 25.000 FPS

Where do these values come from?

When looking at the source file I get:

Video Count : 378 Count of stream of this kind : 1 Kind of stream : Video Kind of stream : Video Stream identifier : 0 StreamOrder : 0 FirstPacketOrder : 0 ID : 224 ID : 224 (0xE0) Format : MPEG Video Format : MPEG Video Commercial name : MPEG-2 Video Format version : Version 2 Format profile : Main@Main Format settings : CustomMatrix / BVOP Format settings, BVOP : Yes Format settings, BVOP : Yes Format settings, Matrix : Custom Format settings, Matrix : Custom Format_Settings_Matrix_Data : 10111112121213131313141414141415151515151516161616161616171717171717171718181818181818191A191A1A191B1B1B1A1B1C1C1C1C1E1E1E1F1F21 Format settings, GOP : M=3, N=15 Format settings, picture structure : Frame Internet media type : video/MPV Duration : 178600 Duration : 2 min 58 s Duration : 2 min 58 s 600 ms Duration : 2 min 58 s Duration : 00:02:58.600 Duration : 00:02:58:15 Duration : 00:02:58.600 (00:02:58:15) Bit rate mode : VBR Bit rate mode : Variable Bit rate : 9000000 Bit rate : 9 000 kb/s Width : 720 Width : 720 pixels Height : 576 Height : 576 pixels Sampled_Width : 720 Sampled_Height : 576 Pixel aspect ratio : 1.067 Display aspect ratio : 1.333 Display aspect ratio : 4:3 Frame rate : 25.000 Frame rate : 25.000 FPS Frame count : 4465 Standard : PAL Color space : YUV Chroma subsampling : 4:2:0 Chroma subsampling : 4:2:0 Bit depth : 8 Bit depth : 8 bits Scan type : Interlaced Scan type : Interlaced Scan order : BFF Scan order : Bottom Field First Compression mode : Lossy Compression mode : Lossy Bits/(Pixel*Frame) : 0.868 Delay : 247.811111 Delay : 248 ms Delay : 248 ms Delay : 248 ms Delay : 00:00:00.248 Delay_DropFrame : No Delay, origin : Container Delay, origin : Container Delay_Original : 0 Delay_Original : 00:00:00.000 Delay_Original_Settings : drop_frame_flag=0 / closed_gop=1 / broken_link=0 Delay_Original_DropFrame : No Delay_Original_Source : Stream Time code of first frame : 00:00:00:00 Time code source : Group of pictures header GOP, Open/Closed : Open GOP, Open/Closed : Open GOP, Open/Closed of first frame : Closed GOP, Open/Closed of first frame : Closed Stream size : 201127997 Stream size : 192 MiB (96%) Stream size : 192 MiB Stream size : 192 MiB Stream size : 192 MiB Stream size : 191.8 MiB Stream size : 192 MiB (96%) Proportion of this stream : 0.95628 Buffer size : 229376 intra_dc_precision : 9

for the video no indication of VFR.

Cu Selur