The mp4 tag has no wiki summary.
5
votes
2answers
149 views
I changed the .mp4 extension of my video to .mpg and it still opens and plays fine (in VLC and in Windows Media Player). Why is this so?
I'm uploading a file to an external system that accepts only mpg or mpeg extension files. I had a mp4 file so I changed the mp4 extension to mpg and I was able to upload the file into the system. ...
4
votes
1answer
128 views
How to create a x264 (mp4) video with the smallest size using ffmpeg that has just 1 image through entire video?
I'm creating narrated mp4 (x264+aac) videos for books. Each video has just the book's cover as the background.
I wonder what would be the most effective way to create such videos with ffmpeg?
I've ...
3
votes
1answer
56 views
Do video formats support colour profiles?
Recently, I was reading a wiki, dedicated to one popular cartoon show and stumbled upon an interesting problem:
From left to right: frames from the US iTunes, Australian iTunes and US iTunes version ...
2
votes
3answers
859 views
Gradient banding
I have a video with a gradient background, with silhouette vector animations on top. The gradient therefore stays exactly the same throughout the video.
However, rendering the video as mp4, I'm ...
2
votes
1answer
965 views
How to force ffmpeg to insert keyframe at first frame when downsampling a framerate of a video with x264 vcodec
I have a mpeg4 video at 25fps. This video contains just one static frame. I'm trying to downsample the frame rate to 1fps and convert the video to x246 (mp4).
I ran the following ffmpeg command:
...
2
votes
2answers
558 views
Can I manually change an .mp4 to .m4v by changing the extension in the Finder (mac) or explorer (win)?
I need to change an .mp4 (h264, AAC-Audio) to an exactly same .m4v. Can I just rename it from "X.mp4" to "X.m4v"? By renaming, I mean clicking on it in Finder (Mac) or Explorer (Win) and renaming it.
1
vote
3answers
255 views
Utility or method for joining MP4 files
I have two MP4 files that I generated with Camtasia Studio. I need to join them together post rendering with Camtasia (it can't be done during the Camtasia rendering process). Looking for a utility or ...
1
vote
1answer
322 views
2 h264/mp4 files does not merging in right way by mp4box
I have a problem when merging two h264/mp4 files with the same parameters except length. I'm using the command
mp4box -cat ....
After that the video player's behaviour is strange: if I drag the ...
1
vote
1answer
218 views
How can I convert the AAC audio in an MP4 from CBR to VBR?
I'm trying to get MP4 video files I have created in Corel VideoStudio to play on an XBox 360 via streaming from a NAS device.
In my question on gaming.stackexchange.com, it's come up, that perhaps ...
1
vote
0answers
67 views
Possible to use sRGB as mp4 colorspace?
I have an mp4 using h264 that i'm using in the background of a website. It has to blend in with the background image. I've already created ogv and webm videos for firefox and chrome and these work ...
0
votes
3answers
173 views
How to Create a High Quality, Small File Size .mp4 from .mov
Recently, I helped a friend produce a short zombie comedy.
He has now asked me to add it to the film's website as a digital download. I'm not having issues with the digital download. My issue is how ...
0
votes
1answer
141 views
What is the difference between mkv and mp4 files?
I don't know if this is the correct exchange site to ask this question. I would like to know what is the difference between mkv and mp4 files?
