.mp4flvogg-vorbisrecordmydesktopvideo conversion
I have used gtk-recordMyDesktop to make a video as an OGV file using the default settings. I need to do 3 things:
How can I reduce the screen resolution (height and width) so that it can fit into a smaller video size on my website?
How can I pull out like every third frame so that the file size is not so large, yet not mess up the sound?
Not all Windows IE users can view OGV files. How can I convert to FLV (or, as a fallback, MP4) so that I can share on my blog?
My answer to this question: How can I maximum compress video files? may be helpful for your case. In this answer I talk about Miksoft's Mobile Media Converter, but there are a few alternatives to this task which can easily be reached over the net.
Anyway, Mobile Media Converter will only work for 32 bit version OS's. And for both 32/64 bit version I suggest you to give a chance to
And there are some other useful Transcoding Software, which includes Non Linear Editing Systems like those mentioned on the answers to this question: What is an easy video editor? and command line using ffmpeg. (as mentioned by @tomodachi)
Nevertheless, the trick in compression (in order to make the videos lighter when loaded to/from the server) isn't in the software itself but the way you make your videos.
You must pay special attention to the Audio and Video Bitrates, which determines both the quality and file size for the resulting transcoded videos and remember that the higher bitrate will result in a higher quality but it will also drop "heavy" file sizes.
You should run as many tests as you need in order to feel comfortable with both the resulting quality and file size.
There is no a pre-defined set of parameters which will do always the same for your videos when you are trying to save something, let's say: quality and file size, or in the worst case: both them.
There is no such "magic codec" that will result in a better quality with small file sizes. Take in consideration that you could have a mpeg1 video file (VCD) with a high bitrate looking better than an mp4 video file with a lower bitrate.
Additionally and only for your consideration:
The FileInfo.com webpage related to "Video Formats" provides an extensive and really comprehensive list of video formats, its available software which can be used to play each one and the "popularity".
You may also wish to take a look to the "Digital Container format" and the table of "Comparison of container formats".
Good luck!
- Parts of this answer were took from Reduce avi size without losing too much quality
There is a bug filed with libav about this exact issue. Depressingly, is doesn't seem to be addressed. I think it's best to consider avconv a good encoding tool, but not a good encapsulating tool.
The best way to go about it is to use MP4Box from GPAC. It's a utility which seems to be primarily concerned with encapsulating media streams into mp4 files. It does not do en/de/transcoding, for instance. If you install GPAC on Ubuntu, you can say:
MP4Box -add non-streamable.mp4 new-shiny-streamable.mp4
MP4Box by default makes the mp4 files streamable:
As of version 0.2.4, MP4Box always stores the file with 0.5 second interleaving and meta-data at the begining, making it suitable for HTTP streaming. (source)
Best Answer
You can resize and convert with
ffmpegusingffmpeg -i input.ogv -s widthxheight -sameq output.flv.You can also change the video bit rate with
-b:v bitarateand control the frame rate with-r framerateto reduce the size of outcome. As izx has mentioned the bit rate option is recommended over changing frame rate or dropping frames.