concatenate files

list.txt

@@ -0,0 +1,2 @@
+file '/tmp/genBase.mp3'
+file '/tmp/quote.mp3'

main.py

@@ -1,5 +1,6 @@
 from fastapi import FastAPI, UploadFile, HTTPException
 from ffmpeg import input, output, run
+import ffmpeg
 import boto3
 import os
 
@@ -28,9 +29,12 @@ async def merge_audio(output_key: str):
     s3_gen_base_key = f'{s3_directory}/genBase.mp3'
     s3_quote_key = f'{s3_directory}/quote.mp3'
 
+    input_files = ['genBase.mp3', 'quote.mp3']
     try:
-        s3_client.download_file(s3_bucket_name, s3_gen_base_key, gen_base_file)
-        s3_client.download_file(s3_bucket_name, s3_quote_key, quote_file)
+        for input_file in input_files:
+            s3_object_key = f'{s3_directory}/{input_file}'
+            local_file = temp_dir + input_file
+            s3_client.download_file(s3_bucket_name, s3_object_key, local_file)
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"Failed to download files from S3: {e}")
 
@@ -38,11 +42,12 @@ async def merge_audio(output_key: str):
     output_file = temp_dir + 'output.mp3'
 
     # Use python-ffmpeg to merge audio clips
-    input_args = [input(gen_base_file), input(quote_file)]
-    output_args = output(output_file, acodec='copy')
+    # input_file_paths = [temp_dir + input_file for input_file in input_files]
+    # input_args = [input(file_path) for file_path in input_file_paths]
+    input_file = 'list.txt'
 
     try:
-        run(*input_args, output_args, overwrite_output=True)
+        ffmpeg.input(input_file, format='concat', safe=0).output(output_file, c='copy').run()
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"FFmpeg Error: {e}")