260 lines
10 KiB
Python
260 lines
10 KiB
Python
import streamlit as st
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import os
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import tempfile
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from moviepy.editor import VideoFileClip
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import ffmpeg
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from transformers import WhisperProcessor, WhisperForConditionalGeneration
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import tqdm
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# Load Whisper model
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@st.cache_resource
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def load_whisper_model():
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try:
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processor = WhisperProcessor.from_pretrained("openai/whisper-medium")
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model = WhisperForConditionalGeneration.from_pretrained("openai/whisper-medium")
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return processor, model
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except Exception as e:
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st.error(f"Failed to load Whisper model: {str(e)}")
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return None, None
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processor, model = load_whisper_model()
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def transcribe_audio(audio_file, language, chunk_length=3): # Changed default to 3 seconds
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if model is None or processor is None:
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st.error("Whisper model is not loaded. Cannot transcribe audio.")
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return []
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# Load audio
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audio_input, sr = AudioLoader.load_audio(audio_file)
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# Calculate number of samples per chunk
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samples_per_chunk = int(chunk_length * sr)
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segments = []
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for i in tqdm.tqdm(range(0, len(audio_input), samples_per_chunk)):
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chunk = audio_input[i:i+samples_per_chunk]
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# Pad/trim audio chunk
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chunk_input = processor.feature_extractor(chunk, sampling_rate=sr, return_tensors="pt").input_features
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# Generate token ids
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predicted_ids = model.generate(chunk_input, language=language)
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# Decode token ids to text
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transcription = processor.batch_decode(predicted_ids, skip_special_tokens=True)
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start_time = i / sr
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end_time = min((i + samples_per_chunk) / sr, len(audio_input) / sr)
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segments.append({
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"start": start_time,
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"end": end_time,
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"text": transcription[0].strip()
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})
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return segments
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def format_srt(segments):
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srt_content = ""
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for i, segment in tqdm.tqdm(enumerate(segments, start=1)):
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start_time = format_timestamp(segment['start'])
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end_time = format_timestamp(segment['end'])
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text = segment['text'].strip()
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if text: # Only add non-empty segments
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srt_content += f"{i}\n{start_time} --> {end_time}\n{text}\n\n"
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return srt_content
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def format_timestamp(seconds):
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hours = int(seconds // 3600)
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minutes = int((seconds % 3600) // 60)
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seconds = seconds % 60
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milliseconds = int((seconds - int(seconds)) * 1000)
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return f"{hours:02d}:{minutes:02d}:{int(seconds):02d},{milliseconds:03d}"
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# Add this helper class for audio loading
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class AudioLoader:
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@staticmethod
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def load_audio(file_path):
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import librosa
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audio, sr = librosa.load(file_path, sr=16000)
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return audio, sr
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def burn_subtitles(video_path, srt_content, subtitle_style):
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with tempfile.NamedTemporaryFile(delete=False, suffix='.srt') as temp_srt:
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temp_srt.write(srt_content.encode('utf-8'))
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temp_srt_path = temp_srt.name
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output_path = os.path.splitext(video_path)[0] + '_with_captions.mp4'
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temp_video_path = os.path.splitext(video_path)[0] + '_temp_video.mp4'
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temp_audio_path = os.path.splitext(video_path)[0] + '_temp_audio.aac'
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try:
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# Extract video metadata
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probe = ffmpeg.probe(video_path)
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video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
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if video_stream is None:
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raise ValueError("No video stream found in the input file.")
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width = int(video_stream['width'])
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height = int(video_stream['height'])
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# Extract audio
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ffmpeg.input(video_path).output(temp_audio_path, acodec='aac', audio_bitrate='128k').overwrite_output().run(capture_stdout=True, capture_stderr=True)
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# Process video with subtitles (without audio)
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ffmpeg.input(video_path).filter(
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'subtitles',
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temp_srt_path,
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force_style=subtitle_style
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).output(
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temp_video_path,
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vcodec='libx264',
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video_bitrate='2000k',
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an=None,
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s=f'{width}x{height}'
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).overwrite_output().run(capture_stdout=True, capture_stderr=True)
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# Combine video with subtitles and original audio
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ffmpeg.concat(
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ffmpeg.input(temp_video_path),
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ffmpeg.input(temp_audio_path),
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v=1,
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a=1
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).output(output_path, vcodec='libx264', acodec='aac').overwrite_output().run(capture_stdout=True, capture_stderr=True)
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# Check if the output file was created and has both video and audio streams
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if os.path.exists(output_path):
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output_probe = ffmpeg.probe(output_path)
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output_video_stream = next((stream for stream in output_probe['streams'] if stream['codec_type'] == 'video'), None)
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output_audio_stream = next((stream for stream in output_probe['streams'] if stream['codec_type'] == 'audio'), None)
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if output_video_stream is None or output_audio_stream is None:
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raise ValueError("Output file is missing video or audio stream.")
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else:
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raise FileNotFoundError("Output file was not created.")
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except (ffmpeg.Error, ValueError, FileNotFoundError) as e:
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st.error(f"An error occurred while burning subtitles: {str(e)}")
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return None
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finally:
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os.unlink(temp_srt_path)
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if os.path.exists(temp_video_path):
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os.unlink(temp_video_path)
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if os.path.exists(temp_audio_path):
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os.unlink(temp_audio_path)
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return output_path
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def convert_to_web_compatible(input_path):
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output_path = os.path.splitext(input_path)[0] + '_web.mp4'
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try:
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(
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ffmpeg
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.input(input_path)
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.output(output_path, vcodec='libx264', acodec='aac',
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video_bitrate='1000k', audio_bitrate='128k')
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.overwrite_output()
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.run(capture_stdout=True, capture_stderr=True)
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)
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return output_path
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except ffmpeg.Error as e:
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st.error(f"An error occurred while converting the video: {e.stderr.decode()}")
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return None
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st.title("Reel Caption Maker")
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if 'temp_video_path' not in st.session_state:
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st.session_state.temp_video_path = None
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if 'web_compatible_video_path' not in st.session_state:
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st.session_state.web_compatible_video_path = None
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uploaded_file = st.file_uploader("Choose a video file", type=["mp4", "mov", "avi"])
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if uploaded_file is not None:
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# Save the uploaded file to a temporary location if not already done
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if st.session_state.temp_video_path is None or not os.path.exists(st.session_state.temp_video_path):
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with tempfile.NamedTemporaryFile(delete=False, suffix='.mp4') as temp_video:
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temp_video.write(uploaded_file.read())
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st.session_state.temp_video_path = temp_video.name
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# Convert the video to web-compatible format
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st.session_state.web_compatible_video_path = convert_to_web_compatible(st.session_state.temp_video_path)
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# Create two columns for layout
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col1, col2 = st.columns([2, 3])
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with col1:
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st.subheader("Video Player")
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# Display the web-compatible video
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if st.session_state.web_compatible_video_path:
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st.video(st.session_state.web_compatible_video_path)
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else:
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st.error("Failed to convert video to web-compatible format.")
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with col2:
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st.subheader("Captions")
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language = st.selectbox("Select video language", ["French", "English"])
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lang_code = "fr" if language == "French" else "en"
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if st.button("Generate Captions"):
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with st.spinner("Generating captions..."):
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video = VideoFileClip(st.session_state.temp_video_path)
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audio = video.audio
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audio.write_audiofile("temp_audio.wav")
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segments = transcribe_audio("temp_audio.wav", lang_code, chunk_length=3)
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srt_content = format_srt(segments)
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st.session_state.srt_content = srt_content
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st.session_state.temp_audio_path = "temp_audio.wav" # Store the audio path
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video.close()
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if 'srt_content' in st.session_state:
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edited_srt = st.text_area("Edit Captions (SRT format)", st.session_state.srt_content, height=300)
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if st.button("Burn Captions and Download"):
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with st.spinner("Burning captions onto video..."):
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subtitle_style = (
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'Fontname=Arial,Fontsize=16,'
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'PrimaryColour=&H00FFFFFF&,'
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'SecondaryColour=&H00000000&,'
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'OutlineColour=&H00000000&,'
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'BackColour=&H40000000&,'
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'BorderStyle=1,'
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'Outline=1,'
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'Shadow=1,'
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'MarginV=20'
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)
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output_path = burn_subtitles(st.session_state.temp_video_path, edited_srt, subtitle_style)
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if output_path:
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with open(output_path, "rb") as file:
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st.download_button(
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label="Download Video with Captions",
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data=file,
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file_name="video_with_captions.mp4",
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mime="video/mp4"
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)
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os.remove(output_path)
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os.remove(st.session_state.temp_audio_path)
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if 'temp_audio_path' in st.session_state:
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del st.session_state.temp_audio_path
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else:
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st.error("Failed to burn captions onto the video.")
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if st.button("Reset"):
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# Clear session state
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for key in list(st.session_state.keys()):
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del st.session_state[key]
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# Remove temporary files
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if 'temp_video_path' in st.session_state and os.path.exists(st.session_state.temp_video_path):
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os.remove(st.session_state.temp_video_path)
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if 'web_compatible_video_path' in st.session_state and os.path.exists(st.session_state.web_compatible_video_path):
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os.remove(st.session_state.web_compatible_video_path)
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if 'temp_audio_path' in st.session_state and os.path.exists(st.session_state.temp_audio_path):
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os.remove(st.session_state.temp_audio_path)
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st.success("All data has been reset. You can now upload a new video.")
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