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up vote 0 down vote favorite I am encoding with ffmpeg. What I'm doing right now is to split it into a ts file and then paste it back to the mp4 file via the concat option. But the problem is that there is a subtitles in this video, but when it is attached to an mp4 file, the subtitles disappears. -analyzeduration 100M -probesize 100m and -c: s copy option to create ts image and then check with ffprobe. I am convinced that this stream is a subtitle stream, because the original video also has a 0: 2 portion as a subtitle stream. I have inserted both images with the concat option -analyzeduration 100M -probesize 100M and -c: s copy, but no subtitles was created in the mp4 file. If I use the concat option, it does not encode. Is it because of it? This is my code ffmpeg -analyzeduration 100M -probesize 100M -y -i Whisper_of

up vote 0 down vote favorite I am given the following question : Let f(z) = 1/(1+z) [z is a complex number] (a) Expand f(z) about z=1. (b) Find the region of convergence. I am able to solve part (a) using Taylor series expansion, but how should I proceed with part (b)? Our professor said that the region of convergence is a circle with radius |z-1|<2. How do I arrive at this? complex-analysis power-series share | cite | improve this question edited Nov 17 at 7:44 José Carlos Santos 142k 20 111 207 asked Nov 17 at 7:36