[FFmpeg-user] Codec error when adding color parameter to fade

[pdr0]

When appending videos, you usually need to match the specs for the video,
including dimensions, framerate, pixel format

filtered.mp4 is 640x352, 30fps

intro.mp4 is 1080x608, 59.94fps

My guess is that is part of the reason.  The specs can change midstream for
a transport stream, but some players , decoders might have problems with it. 
MP4 container does not support changes midstream as well as transport
streams

The aspect ratio is slightly different between them. 1.818 vs. 1.776. You'd
have to letterbox the filtered version if converting that up; or if you
didn't care about the AR error, then just resize it





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