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    def merge_ts_files(self):
        os.chdir("./tmpTS")
        file_list = sorted(os.listdir("./"), key=len)
        with open("./all.txt", "w+") as f:
            for file in file_list:
                if file.endswith(".ts") and not file.startswith("output"):
                    f.write(f"file {file}\n")
        print(os.getcwd())
        command = "ffmpeg -err_detect ignore_err -f concat -i ./all.txt -c copy ./output.mp4"
        # command = f"ffmpeg  -f concat -i ./all.txt -c:v libsvtav1 -preset 7 -crf 24 ./output.mp4"
        print(command)
        os.system(command)