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Best Video Converter

Transcoding is the direct digital-to-digital conversion of one encoding to another. This is often done in cases where a target device does not support the format or has limited storage capacity that mandates reduced file size, or to convert incompatible or obsolete data to a more supported or modern format. When transcoding one lossy file to another, the process always introduces generation loss (albeit perhaps imperceptible).

Here list video converter (transcode) software that i often use for many times, and i hope this could help.

MeGUI (Windows only)

MeGUI is a video conversion application, which was primarily designed to be a DVD ripper, but is capable of many transcoding tasks. It is essentially a frontend for many free tools, but also includes a number of utilities to enhance the conversion process. MeGUI is a free program which has many ties with doom9.org

Input:

DVD (vob through d2v) and other MPEG-1 and MPEG-2 streams receive special input support for demuxing of audio and subtitles, and faster video seeking
Any computer video file via AviSynth

Output:

Video Encoders: x264, XviD, libavcodec MPEG-4 Part 2, Snow
Audio Formats: MP2/MP3 (via LAME/ffmpeg), AAC (via FAAC, Nero AAC or Coding Tech AAC), Vorbis, AudX, AC3
Container formats: Matroska, MP4, AVI

Dr. DivX (Windows Only)

The goal of the Dr. DivX 2.0 OSS project is to build an application which is portable and capable of transcoding as many video formats as possible to DivX.

Able to convert most input files Dr. DivX can convert most input files including MPEG-1, MPEG-2, VOB, AVI, FLV, MOV, MP4, AVISynth scripts to DivX.
Uses available DivX encoder If you install a new version of the DivX encoder, Dr. DivX automatically uses it for encoding.
Tweak encode settings If required, encode settings can be manually configured for optimal output.
Generates DivX files which are playable on DivX certified players Since Dr. DivX respects DivX certification constraints, all files generated by the application are guaranteed to playback on DivX certified hardware players.
Watch folders Monitor user specified folders to automatically convert newly added files using configured output profile.
Supports multiple audio tracks Convert multiple audio tracks using different encoder settings for each track. MP3, MP3 Surround and AC-3 are supported output audio formats.
Supports multiple subtitle tracks in VOB input Convert DVD subtitle tracks to DivX XSUB subtitle tracks.
Automatically configures encode settings for requested quality level User needs to choose only the required quality level, the application does the rest.

Include MP3 surround encoder Dr. DivX can encode your multi-channels 5.1 audio and video sources to MP3 surround, MP3 surround is backward compatible with “Normal” MP3 while preserving the full 5.1 channel separation. You will need to use the DivX player 6.4 to take advantage of 5.1 audio decoding.
Automatically configures encode settings for requested output file size User needs to choose only the required output file size, the application does the rest.
Create and load custom profiles Manage encoding settings using custom profiles.
Preview video crop and resize settings Real-time updations of video based on user specified crop and resize values.
Batch control Re-order, Re-configure and Remove encodes from the batch.
Audio track preview Playback input audio tracks to confirm correct selection for encode.
Track information tagging Tag audio and subtitle tracks with descriptive information.
Pause and resume encodes Resume from paused encode stage.
Post encode plugins Add and configure plugins which will run after an encode has successfully finished.
CLI version of application for scripting Use the CLI version of application for automated batch encodes.

MPEG Streamclip (Windows & Mac)

MPEG Streamclip is a powerful high-quality video converter, player, editor for MPEG, QuickTime, transport streams, iPod. And now it is a DivX editor and encoding machine, and even a stream and YouTube downloader.

You can use MPEG Streamclip to: open most movie formats including MPEG files or transport streams; play them at full screen; edit them with Cut, Copy, Paste, and Trim; set In/Out points and convert them into muxed or demuxed files, or export them to QuickTime, AVI, DV and MPEG-4 files with more than professional quality, so you can easily import them in Final Cut Pro, DVD Studio Pro, Toast 6, 7, 8, and use them with many other applications or devices.
Supported input formats: MPEG, VOB, PS, M2P, MOD, VRO, DAT, MOV, DV, AVI, MP4, TS, M2T, MMV, REC, VID, AUD, AVR, VDR, PVR, TP0, TOD, M2V, M1V, MPV, AIFF, M1A, MP2, MPA, AC3, …

Handbrake (Windows, Mac, Linux)

Supported Sources:

Any DVD-like source: VIDEO_TS folder, DVD image or real DVD (unencrypted–protection methods including CSS are not supported internally and must be handled externally with third-party software and libraries), and some .VOB and .TS files
Most any multimedia file it can get libavformat to read and libavcodec to decode.

Outputs:

File format: MP4 and MKV
Video: MPEG-4, H.264, or Theora
Audio: AAC, CoreAudio AAC (OS X Only), MP3, or Vorbis. AC-3 pass-through, DTS pass-thorugh (MKV only)

Misc features:

Chapter selection
Subtitles
Integrated bitrate calculator
Picture deinterlacing, cropping and scaling
Live Video Preivew

StaxRip (Windows only)

What is StaxRip?

With StaxRip you can easily convert your DVD’s, DVB captures and many more formats into MPEG-4 with codecs like x264, XviD and DivX. As a open source application StaxRip is completely free.

What formats are supported?

Video Output Formats: x264, XviD, DivX
Audio Output Formats: AAC, MP3, AC3, Vorbis
Container Output Formats: MKV, AVI, MP4, DIVX

What features are supported?

Open Source, Freeware
Easy to use
Versatile and customizable
Reasonable default values for filters and codecs
Help system including, online help (assistant), context sensitive help, forum support
Rich cutting/trim facilities for tasks like removing ads
Job and batch processing

ffmpegX (Mac only)

Reads the following input formats: MPEG-1, MPEG-2, MPEG-4, DIVX, XviD, non-encrypted VOB and VIDEO_TS, Quicktime .MOV, .DV, .WAV, Real Audio, Real Video, H.263, MP4 H.264, PGM, YUV, PPM, AC3, PCM8/16 bits, mulaw/Alaw, WMA-1/2, SUN AU format, MP2, MP3, AAC, 3GP, FPS1, ALAC, and even more formats
Converts the above formats to DivX, AVI XviD, H.264 MP4, MOV, DV, 3GP, Sony PSP, MP2, MP3, AAC, AC3, MPEG-1, MPEG-2, VCD, CVD, SVCD, KVCD, KSVCD, DVD, KDVD and MPEG-TS with complete control over encoding options.
Super-fast. Many conversions are faster than realtime. DIVX encoding on a G5 dual is twice as faster as realtime.
Queue encodings in the ffmpegX Progress window.
Includes a full-featured universal video player (mplayer) supporting VOB and text subtitles, with choice of fonts, font sizes and international text encodings including Japanese, Chinese, Russian, Greek and more.
Supports subtitles in VobSub, SubRip, MicroDVD, SubViewer, Sami, VPlayer, RT, SSA, AQTitle, JACOsub and MPsubt formats
Allows creation of DVD selectable subtitles
Includes a subtitle converter with OCR from VOB image format to SRT text format.
Includes a bitrate calculator to control best image quality and target filesize.
Includes an automatic crop tool.
Includes a series of video tools like split, join, fix, mux, demux.
Compresses a non-encrypted DVD to 4GB without reencoding it.
Reauthors SVCD as DVD.
Creates DVD image files from VIDEO_TS folders.
Converts SRT subtitles to DVD Studio Pro 1.5 format.
Creates AVI or MPG files with two audio tracks.
Authors as VCD or K/XVCD (.bin/.cue files for burning with Toast by dropping the .bin into VCD window).
Authors as SVCD, CVD or K/XSVCD (two .img files to be burned in Toast under Multitrack XA window).
Authors as DVD (/DVD/ folder for burning in Toast DVD mode, and .img file for burning in Disk Image app or Toast disk image mode).