New answers tagged audio
Here is a list of equipments my film-making friends consider very useful.(I own few of them). Budget is $1800, excluding a good computer and post production software. A decent DSLR camera with kit lens. (eg: Canon t3i with 18-55mm lens - $500) Prime lens for great image quality and shallow depth of field (Canon 50mm f1.8 - $100). Great for shooting ...
ffmpeg is a good choice for this task. You can do this with this command: ffmpeg -i input.mp4 -i input_audio.aac -map 0:0 -map 1 -vcodec copy -acodec copy output.mp4
Yes, ffmpeg can do what you need, which is to demux the MP4 into audio and video components, then remux using the new audio. Actually, you can extract just the video since you don't need the existing audio. I'm not an expert in ffmpeg, but the demux command line would be something like ffmpeg -i myfile.mp4 -vcodec copy myvideo.h264.
A standard for WAV is 48K / 16 bit mono, or stereo if there's ambiance or presence you'd like to preserve. The last two parameters are a consequence of those choices and you can calculate them based on your selection. Then any compression you might apply afterward will have a good starting basis. If all you're after is intelligibility, a lower sample rate ...
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