Convert H261 to M4B Audiobook

H261 to M4B Converter converts H261 files to M4B audiobook. The software is an ALL-IN-ONE audio converter that supports more than 110 audio and video files.

H261 to M4B Converter supports batch conversion and is full compatible with Windows 10/8/7/Vista/XP/2000.

1. Free Download H261 to M4B Converter and then install the software by instructions
2. Launch H261 to M4B Converter
3. Choose H261 Files


Click on "Add Files" button to choose H261 files and add them to conversion list.


Choose one or more H261 files you want to convert and then click Open.


4. Choose "to M4B"




5. Convert H261 to M4B Audiobook


Click on button "Convert" to convert H261 files to M4B audiobook.


Alternatively, you could click "Convert to One" to convert and combine/join/merge multiple H261 files to one M4B audiobook.


The software is converting H261 files to M4B audiobook.


6. Play and Browse M4B Audiobook


Right-click converted M4B audiobook and choose "Play Destination" to play the outputted M4B audiobook, choose "Browse Destination Folder" to open Windows Explorer to browse the M4B audiobook.


7. Done

Free Download H261 to M4B Converter

What is H261?
H.261 is a 1990 ITU-T video coding standard, ratified in November 1988. Originally designed for transmission over ISDN lines on which data rates are multiples of 64 kbit/s. It is one member of the H.26x family of video coding standards in the domain of the ITU-T Video Coding Experts Group (VCEG). The coding algorithm was designed to be able to operate at video bit rates between 40 kbit/s and 2 Mbit/s. The standard supports two video frame sizes: CIF (352x288 luma with 176x144 chroma) and QCIF (176x144 with 88x72 chroma) using a 4:2:0 sampling scheme. It also has a backward-compatible trick for sending still picture graphics with 704x576 luma resolution and 352x288 chroma resolution (which was added in a later revision in 1993).

The H.261 standard actually only specifies how to decode the video. Encoder designers were left free to design their own encoding algorithms, as long as their output was constrained properly to allow it to be decoded by any decoder made according to the standard. Encoders are also left free to perform any pre-processing they want to their input video, and decoders are allowed to perform any post-processing they want to their decoded video prior to display. One effective post-processing technique that became a key element of the best H.261-based systems is called deblocking filtering. This reduces the appearance of block-shaped artifacts caused by the block-based motion compensation and spatial transform parts of the design. Indeed, blocking artifacts are probably a familiar phenomenon to almost everyone who has watched digital video. Deblocking filtering has since become an integral part of the most recent standard, H.264 (although even when using H.264, additional post-processing is still allowed and can enhance visual quality if performed well).

What is M4B?
Audiobook file based on the MPEG-4 container format; typically compressed with .AAC encoding; nearly identical to a .M4A file, but denoted as an audiobook and can be "bookmarked" by supporting audio players such as iTunes and iPod.

The M4B extension is used by audiobooks downloaded from the Apple iTunes store; these audiobooks may be copy-protected using Apple's FairPlay DRM, which means they can only be played on authorized computers or iPods.

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