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This article describes the main window in the Qt graphical user interface, which is the default GUI for the official Microsoft Windows builds of Avidemux. GNOME, Xfce or LXDE users may prefer the GTK+ version.
The main toolbar allows easy access to the commonly used actions:
;Button_open-Qt.png:Open a video file
;Button_save-Qt.png:Save a video file
;File_properties-Qt.png:Display file information (audio/video codec, resolution etc.)
;Button_save-Qt.png:Save a project
;Button_calculator-Qt.png:Open a bitrate/filesize calculator – it calculates the video size for 2-pass encoding (because only video size, without audio, is required in the 2-pass codec settings), clicking the OK button sets the 2-pass video size for the selected encoder
;Input-Qt.png:Input – display input (unfiltered) video in the main window ;Output-Qt.png:Output – display filtered output in the main window ;Side-Qt.png:Side – display both input and output in the main window, horizontally ;Top-Qt.png:Top – display input and output stacked vertically ;Separate-Qt.png:Separate – display input in the main window and output in a separate window
The navigation bar is used for navigation, using the navigation slider on the left and the buttons, playback, selecting parts of the file (cutting) and time information. The blue rectangle marks the current selection.
;Previous_frame-Qt.png:Go to previous frame
;Next_frame-Qt.png:Go to next frame
;Previous_keyframe-Qt.png:Go to previous intra frame (keyframe)
;Next_keyframe-Qt.png:Go to next keyframe
;Previous_black_frame-Qt.png:Go to previous black frame – searching for black frames may take some time and may not be 100% accurate
;Next_black_frame-Qt.png:Go to next black frame
;First_frame-Qt.png:Go to the first frame (beginning)
;Last_frame-Qt.png:Go to the last frame (end)
;Jogshuttle-Qt.png:Jog/shuttle, fast-forward or rewind by turning the wheel, speed depends on how far it is turned; keyframe based navigation
You can either cut or save a selected part of the video.
;MarkA-Qt.png:Set mark A (selection start) to the current frame
;MarkB-Qt.png:Set mark B (selection end) to the current frame
;Selection-Qt.png:This frame shows the corresponding frame numbers for A and B marks (unless you set A or B marks, the whole video is selected), pressing the buttons with the numbers means “go to mark A” or “go to mark B”
;Frame-Qt.png:Displays current frame and total number of frames – when you enter a frame number into the current frame text box and press Enter, Avidemux will go to that frame
;Time-Qt.png:Displays current time and total time – when you change the time in the current frame text box and press Enter, Avidemux will go to that time
;Frame_type-Qt.png:Type of the current frame (I-frame, P-frame or B-frame), the number between brackets shows the quantizer used to encode the displayed image (meaningful only when used with a quantizer type codec like the MPEG codecs)
The toolbar on the left can be used for setting audio and video encoders, filters and the output format.
Audio and video encoders are listed in a “format (encoder)” form, where format is the specification, standard, while encoder is the particular software library, implementation, that encodes the stream to the chosen format. For example, “MPEG-4 ASP (Xvid4)” means the output video format is set to MPEG-4 ASP and the chosen software library used for encoding the MPEG-4 ASP video is Xvid. “MP3 (LAME)” means the output audio format is set to MP3 and LAME is the MP3 encoder.
The “Format” menu is mainly used for setting the output container. A container contains audio and video streams multiplexed into a single file. It is important to select a suitable container format for the audio and video stream types selected in the Audio and Video menus. For example, MPEG-2 (DVD, SVCD) or MPEG-1 (VCD) video should not be saved into an AVI container. Some popular A/V format/container combinations include:
;Sidebar-video-Qt.png:The default video codec is “Copy”, which means no video encoding, video from the input will be copied to output (filters cannot be applied in Copy mode) – selecting a video codec for encoding from the drop-down list allows you to configure it (the Configure button) and set video filters (the Filters button); if a supported codec does not appear in the list, it means Avidemux has not been built with support for it
;Sidebar-audio-Qt.png:The default audio codec is “Copy”, which means no audio encoding, audio from the input will be copied to output – selecting an audio codec for encoding from the drop-down list allows you to configure it (the Configure button) and set audio filters (the Filters button); when the the A/V shift checkbox is checked, audio will by shifted by the number of milliseconds set in the A/V shift spin box
;Sidebar-format-Qt.png:Select the output format; the default A/V container is AVI