Which format has the smallest capacity:

It doesn't have to be like this. Transcoding involves many factors.

Such as code rate, scanning mode, compression mode, coding mode, number of channels, etc.

These will affect the file size. If the formats are different

Parameters cannot be completely equivalent.

So we can't compare the sizes.

For example, a wmv full HD debugging short film of 1080p released on Thunder.

After transcoding to 3gp

The file is bigger than before.

The clarity is much worse than before.

For the clarity of the video

Its code rate is the most important reference index.

It can be said (assuming that it is not meaningless to artificially expand the original code rate during transcoding)

The higher the code rate

The better the clarity.

generally speaking

The same movie

The higher the code rate

The better the clarity.

The larger the file.

If you want to maintain the original image quality to the greatest extent

The original video bit rate should be used (lossless compression is the best)

lossy compression

The closer to the original video, the better.

in addition

Check the bit rate of the original video when transcoding.

It has very important reference value.

If there are no specific requirements.

Avi format is the first choice for high bit rate compression.

Because it is scanned frame by frame.

Clear picture

Nice details

Of course, the file will grow accordingly.

Rmvb is better at low bit rate.

Soft compression will blur.

But it will bring a smooth picture. From this perspective,

Avi is really better.

Of course, the file will grow accordingly.

But generally speaking, people's transcoding compression is lossy compression.

For example, after switching to mp4.

If you go back to Avi,

It includes pressure loss.

This pressure loss cannot be recovered.

but

If h.264 encoder is used when transcoding to mp4.

You will still get a very clear mp4 file.

Basically, it can be understood that the calculation method of code rate is the same regardless of the format. If you want similar image quality, you must have similar bit rate.

Higher image quality

You need a higher bit rate to keep up.

Don't be trapped by "what format is good"

The more you want clarity.

You have to seek a higher bit rate (note that the premise is that "it is not meaningless to artificially expand the original bit rate when transcoding". For example, the original video bit rate is 900kbps.

The transcoding must be set to 1200kbps.

There is no point in doing so)

However, different formats of audio and video files may be very different.