jxself <[email protected]> added the comment:

The issue appears to be more with decoding rather than 
encoding because in the example I posted ffmpeg 
reports the frame rate as being 59.94 tbc.

Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 
720x480 [PAR 32:27 
DAR 16:9], 9800 kb/s, 59.94 tbr, 90k tbn, 59.94 tbc

ffmpeg appears to have issues with mpeg program and 
transport streams in PAL content (25fps) is reported 
as 50FPS, same issue with telecined NTSC content 
(23.976 telecined to 29.976 fps) is sometimes reported 
as 47.952. NTSC content at 29.970 fps is reported as 
59.94. The pattern is ffmpeg reports the frame rate as 
doubled.

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FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/roundup/ffmpeg/issue1197>
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