I created an API for transcoding video files like adaptive bit rate of youtube. I used FastAPI. Currently, I am trying to set resolution values for each file. But whenever I am adding multiple resolutions, I am recieving 422 unprocessible entity error in the Swagger.
Here is my code:
async def transcode_video(input_path, output_folder, res, unique_id, total_files, pbar): # Use asyncio for command execution with progress bar output_path = os.path.join(output_folder, f"{res}p.m3u8") # Calculate the target size target_size = calculate_target_size(input_path) cmd_duration = f"ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {input_path}" total_duration = float(subprocess.check_output(cmd_duration, shell=True, text=True).strip()) cmd = ( f"ffmpeg -i {input_path} -vf scale=-2:{res} -c:a aac -b:a 128k " f"-g 50 -hls_time 1 -hls_list_size 0 " f"-crf 23 -b:v 100k -fs {target_size} " f"-hls_segment_filename \"{output_path.replace('.m3u8', '_%03d.ts')}\" " f"{output_path}" ) process = await asyncio.create_subprocess_shell( cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE ) while True: line = await process.stderr.readline() if not line: break line = line.decode().strip() if "time=" in line: # Extracting the time progress from FFmpeg output time_str = line.split("time=")[1].split()[0] current_time = sum(x * float(t) for x, t in zip([3600, 60, 1], time_str.split(":"))) progress = (current_time / total_duration) * 100 pbar.update(progress - pbar.n) # Wait for the transcoding process to complete await process.wait() if process.returncode != 0: raise HTTPException(status_code=500, detail="Video transcoding failed.") pbar.close() # Increment the total number of transcoded files total_files[0] += 1@app.post("/transcode/")async def transcode_video_endpoint(files: List[UploadFile] = File(...), resolutions: List[int] = None): # Counters for transcoded videos total_files = [0] # Iterate over each file for file in files: # Check if the file is a valid video file based on its extension valid_video_extensions = {".mp4", ".avi", ".mkv", ".mov", ".wmv", ".flv"} if not any(file.filename.lower().endswith(ext) for ext in valid_video_extensions): print(f"Skipping non-video file: {file.filename}") continue # Assign a unique ID for each file unique_id = str(uuid.uuid4()) # Log the filename and unique ID print(f"Processing file: {file.filename} with unique ID: {unique_id}") # Create a folder for the unique ID unique_id_folder = os.path.join(OUTPUT_FOLDER, unique_id) Path(unique_id_folder).mkdir(parents=True, exist_ok=True) # Save the uploaded file input_path = os.path.join(UPLOAD_FOLDER, file.filename) with open(input_path, "wb") as video_file: video_file.write(file.file.read()) # Check if the file is a valid video file using ffprobe try: subprocess.run( ["ffprobe", "-v", "error", "-select_streams", "v:0", "-show_entries", "stream=codec_type", "-of", "csv=p=0", input_path], check=True, capture_output=True ) except subprocess.CalledProcessError: print(f"Skipping non-video file: {file.filename}") continue # Determine the resolutions to transcode based on the provided or default resolution resolutions_to_transcode = [res for res in [240, 360, 480, 720] if resolutions is None or res in resolutions] # If resolutions is not exactly 360, 480, 720, or 1080, transcode to the nearest lower resolution if resolutions is not None: resolutions_to_transcode = [get_closest_lower_resolution(res) for res in resolutions] # Transcode the video into the specified resolutions for res in resolutions_to_transcode: output_folder = os.path.join(unique_id_folder, f"{res}p") Path(output_folder).mkdir(parents=True, exist_ok=True) # Call the transcode_video function with tqdm progress bar with tqdm(total=100, desc=f"Transcoding {res}p", position=0, leave=True) as pbar: await transcode_video(input_path, output_folder, res, unique_id, total_files, pbar) # Create index.m3u8 file after transcoding all resolutions create_index_m3u8(unique_id, resolutions_to_transcode) return JSONResponse(content={"message": f"{total_files[0]} videos transcoded."})If I provide one resolution it works fine. But if I provide a list of resolutions for all the uploaded videos I am getting error 422.
Code Details422 Error: Unprocessable EntityResponse bodyDownload{"detail": [ {"loc": ["body","resolutions", 0 ],"msg": "value is not a valid integer","type": "type_error.integer" } ]}I used python 3.8.18. Can you help me please? I tried with list, object but always getting the error. My input format is shown below:
