New answers tagged mp4
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.
The solution was to turn off IE-11's "hardware acceleration" feature which (says here) "lets Internet Explorer move all graphics and text rendering from the CPU to the Graphics Processing Unit (GPU)". I disabled that under Tools -> Internet Options-> Advanced by selecting "Use software rendering instead of GPU rendering". It's pictured here Then, after ...
The root cause is very likely the color space settings in your file. The video is also grey in Firefox on my machine but not in Chrome. If you open your file in MediaInfo you can see this at the bottom of the video stream: Color primaries : BT.601 NTSC Transfer characteristics : BT.709 Matrix coefficients ...
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