ROQ to AVI
ROQ to AVI Converter, Convert ROQ to AVI
ROQ to AVI Software converts ROQ to AVI quickly. Besides AVI, the converter could convert ROQ to common video formats and portable devices, for example, TS, MPEG, iPad, OGG, MOV, WMV, AVI, MP4, 3G2, Xbox 360, and so on.
The converter is an all-in-one video converter that supports more than 100 video and audio file formats and converts to 40 popular formats. It could convert MPE to AVI, 3G2 to MKV, WebM to MKV, THD to iPhone, MKV to WebM, H263 to DV, DNXHD to MPEG, H263 to iPod, and so on.
ROQ to AVI Software supports batch conversion and is full compatible with 32-bit and 64-bit editions Vista and Windows 7.
What is ROQ?
The format runs at a fixed 30 frames per second with an optional 22050 Hz mono or stereo sound track. Videos may technically be up to 65520 x 65520 pixels with both dimensions divisible by 16 and produce a valid RoQ file, but none of id Software's games will play back a video with dimensions that aren't a power of two, most likely because of OpenGL's texture sizing restrictions.
NOTE: It's been reported that movies with dimensions greater than 512 x 512 cause issues in various id Software games. Until this can be positively confirmed or denied it's best to avoid higher resolutions.
RoQ is a motion compensating vector quanitizer format, similar to Cinepak, but higher quality due to the use of the ITU-R BT.601 colorspace (the same one used in component video, PAL televisions, JPEG and MPEG), whereas Cinepak uses a low-quality YUV-like colorspace designed for faster decoding that often results in gamut degradation before compression even begins.
Because it's a vector quantizer, RoQ files are very fast to decode and very slow to encode. Decoding involves nothing more than converting the colorspace of the codebooks and then copying data, whereas encoding involves using several complicated schemes to produce a "palette" of image fragments that will result in the least degradation.
RoQ uses two codebooks per frame, with the second being constructed from pieces of the first, with up to 256 entries each. Due to this, only 1024 new colors can be introduced each frame, severely limiting the color gamut. This could arguably be improved by better predicting which sections will be motion compensated, but doing so is difficult, since codebook entries are generated from non-motion-compensated image sections, but whether or not they'll be used depends on the quality of them compared to motion compensated sections, resulting in a chicken-and-egg problem. This is made worse by the fact that all three major RoQ codecs are single-pass.
While the format is limited and much lower quality than MPEG and Indeo Video, it was presumedly preferred by id Software because of the lack of royalties, the lack of patent liability that presents a serious problem with most video formats, and the absence of complex platform-specific APIs.
What is AVI?
There is slight overhead when used with popular MPEG-4 codecs (Xvid and DivX, for example), increasing file size more than necessary. The AVI container has no native support for modern MPEG-4 features like B-Frames. Hacks are sometimes used to enable modern MPEG-4 features and subtitles, however, this is the source of playback incompatibilities.
Step-by-Step Instructions to Converting ROQ to AVI
Click "Add Files" to choose ROQ files and add them to conversion list.
Choose one or more ROQ files you want to convert and then click Open.
[Optional] If you want to change AVI encoding parameters, for example, vodec codec, bit rate, frame rate, video size, and aspect ratio, please click "Options".
[Optional] Switch to tab "Video Options" and then set encoding parameters.
Click "Convert" to convert ROQ files to AVI.
The software is converting ROQ to AVI.
When conversion completes, you can right-click converted item and choose "Play Destination" to play the outputted file; or choose "Browse Destination Folder" to open Windows Explorer to browse the outputted file.
ROQ to AVI Software is 100% clean and safe to install.
It's certified by major download sites.
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