it takes some time to convert source*.mp4 files to one medium.mp4 enter your text areas contents if needed.Otherwise, only the first stream of each type will be copied. in terminal run: python3 source-to-medium.py (here will be created 'medium.mp4') Important: always use -map 0 when using any copy options to make sure all streams are selected.Put your MP3 file to project directory as 'voice.mp3'.
Put your PNG transparent image to project directory as 'overlay.png'.Put your video files to project directory as 'source1.mp4', 'source2.mp4', etc.Resulting video file are ready to upload on Youtube or any PNG transparent overlay, adding text areas on video, with mp3 audio I've make this script in a try to merge any video sequence files with Overlay, text areas with mp3 audio track. Replicator is a Python script to merge a few video files, transparent I've made a Python script to do this, you can try it if you want. The -map option makes ffmpeg only use the first video stream from the first input and the first audio stream from the second input for the output file. If your input video already contains audio, and you want to replace it, you need to tell ffmpeg which audio stream to take: ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 output.mp4 If your output container can handle (almost) any codec – like MKV – then you can simply copy both audio and video streams: ffmpeg -i video.mp4 -i audio.wav -c copy output.mkv Sound to-video synchronization (AV synchronization, otherwise called lip-sync, or by its absence: lip-sync blunder, lip fold) alludes to the overall planning of sound and video parts during creation, after creation (blending), transmission, gathering, and play-back handling. If your audio or video stream is longer, you can add the -shortest option so that ffmpeg will stop encoding once one file ends. Common Audio and Video Out of Sync Issues. See the FFmpeg Wiki: AAC Encoding Guide for more info. You can use any other desired audio codec if you want. The above command transcodes the audio, since MP4s cannot carry PCM audio streams. Here, we assume that the video file does not contain any audio stream yet, and that you want to have the same output format (here, MP4) as the input format.
It should be something to the effect of: ffmpeg -i video.mp4 -i audio.wav -c:v copy -c:a aac output.mp4 See this example, taken from this blog entry but updated for newer syntax. Merging video and audio, with audio re-encoding
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