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2MP4 - Windows script to convert/remux videos to MP4. Subtitles are supported in both hard and soft formats.

Goals

. Fast - Re-encode only when needed. Selectable encoding speed.

. Flexible - Process multiple folders as well as single videos.

. Set-n-forget - Batch and nested folder processing.

. Simple - Drag-drop operation. One plain-English menu.

Supported video formats: MKV MP4 M4V MOV WMV AVI MPEG1 MPEG2 FLV RM RMVB OGM

Install

. AVISynth (http://sourceforge.net/projects/avisynth2)

. FFDShow (http://videohelp.com/tools/ffdshow), enable AC3/DTS/AAC support in Audio Decoder Config

. Haali Splitter (http://haali.su/mkv)

Use

1. Unpack. Create shortcut to 2MP4.CMD on desktop (don't drag it to the desktop).

2. Drag-drop one or more video files and/or folders onto shortcut.

3. Change settings from pop-up menu as needed. Enter 'S' to start.

Script Options

. Recode H.264 video

AUTO: H.264 video up to 720p high profile and 1080p baseline profile are not recoded. YES: Always recode H.264. NO: Never recode H.264. Note: Non-H.264 videos are always recoded.

. Video quality (19-25, lower number=higher quality/bitrate, default=21)

The default 21 should be the considered as max for Tegra 2 tablets at 720p. There may be stutter in some 720p high action scenes. Suggested setting for Tegra 2 is 22 for 720p high-action movies. SD-sized movies have more leeway and can use 21 or better.

. Video type (LIVE/cartoon/mixed)

The encoder has different tunings for live-action videos and cel-shaded animations (animes). For cel-shaded content, use the Cartoon setting. For any other content, including 3D animations (which most current animated movies are), use Live. If you are converting a batch of live-action & cartoons, use Mixed.

. H.264 profile (HIGH/main/baseline)

High has best compression efficiency but higher playback requirement. Baseline has low playback requirement, but size will be 10-20% larger than High. Use Baseline as last resort for smooth playback. Main is between High and Baseline with respect to size and playback smoothness.

. Encode speed (VERYFAST..veryslow)

Suggested use is MEDIUM for best compromise between speed and quality, VERYFAST for mobile viewing, and VERYSLOW if you have lots of time. There are also intervening settings to taste. Details: VeryFast is twice as fast as Medium, but quality can be slightly worse depending on content. VerySlow has the same quality as Medium at about 10-20% smaller size, but takes 5 times longer. Do not use VerySlow for mobile devices, as higher compression settings may affect playback smoothness.

. Maximize audio volume

Maximizes audio volume without clipping. Enable this if audio is too quiet.

. Burn-in subtitle (Advanced Option)

By default, script extracts any embedded subtitles to external standalone files. If this option is enabled, the script will take the first eligible subtitle and burn it into the video. Subs can be of SRT, ASS, SSA, or VobSub (bitmap) format. Video recoding is mandatory. Subtitle is selected in this order: external, PrefLang embed, AltLang embed, or no-tag embed. If there are multiple eligible subtitles and you want one different from that selected, remux using MKVToolnix (see Notes below) and remove all except the desired subtitle.

. Autocropping (Advanced Option)

Crop black bars if exist. This uses a less efficient method, so enable only when needed.

. Variable framerate encoding (Advanced Option)

The script encodes in constant framerate (CFR) by default. Some videos (animes/hybrid/rmvb) use variable framerate (VFR). If a VFR video is recoded, enable this option, else audio will be out-of-sync (OOS). There's no foolproof way to determine if a video is VFR in advance, so if video is recoded and sound is OOS, enable this setting and try again. Note: This setting only matters when video is recoded. If video is only remuxed, correct framerate is always retained.

Notes

. Audio and subtitle tracks are selected by their language ID. Default is English for both preferred and alternate language. To change, edit 'PrefLang=eng' & 'AltLang=eng' settings in script. Find your language country code here (http://loc.gov/standards/iso639-2/php/code_list.php). ISO 639-2 3-letter code is used. Where there are 2 codes available, use the "B" (bibliographic) code.

. Text (SRT/ASS/SSA) subtitles are selected in this priority: external sub file, embedded sub in preferred language, embedded sub in alt language, embedded sub w/o language tag. Once a sub is found, then lower priority subs are ignored. Note: Any attachment in a MKV (font embeds, cover art, chapters) are also extracted for future use.

. Audio track selection: If a subtitle is available, the first audio track is selected. If no subtitle, then a PrefLang audio track is selected if available, else an AltLang audio is selected. If no Pref/AltLang audio and no sub are available, the first audio track is simply selected. [Note: If audio track has no language tag, the 1st track is selected.] The intent here is that subs are preferable to dubs.

. To manually select a different audio track: Remux to MKV (see below); uncheck undesired audio tracks to make new copy with only the desired audio track. Drop the newly-muxed copy onto the script.

. The number of items that can be batch selected at one time is limited. If processing 20+ files, put them into a folder and drop the folder. Multiple folders can be dropped.

. Video encoder used is 32-bit x264cli, which runs on both 32- and 64-bit systems. To get 10-15% more encoding speed on 64-bit systems, get the 64-bit x264.exe from http://x264.nl and copy over the existing executable.

. The script relies on the host system to provide format splitter and audio codec support.

- [XP and Vista only] To convert MOV/M4V, install QT Lite (http://free-codecs.com/download/QT_Lite.htm).

- To convert FLV, install FLV splitter (http://videohelp.com/tools/FLV_Splitter), and enable FLV decode in FFDShow video decoding options.

- To convert RM/RMVB, install Real Alternative (http://afterdawn.com/software/audio_video/media_players/real_alternative.cfm).

. Remuxing to MKV: Many file formats can be quickly converted to MKV container before being fed to the script, which can solve many problems. To remux to MKV: Run MMG.EXE in \MKVTOOLNIX folder, drag-drop video onto app, click 'Start Muxing'.

Changelog

0.2.4

. Add autocropping

. Bug fixes & refinements