Re: Envy24hf Audio Deck Control Panel Download
Chrystal Dueno
The 1st attempt at editing media was written in 1996. It just loaded asingle WAV file or edit list from the command line & shifted bits of itaround in a single window. Then it could render a new wav file or savethe edit list. It used bare X11 calls & no toolkit.
Its big magic tricks wer handling files up to 2 gigabytes with only 64megs of RAM & non destructive editing. That was a feature normally onlyaccessible to the highest end professional audio houses in those days.
In 1997 Broadcast 1.0 was replaced by Broadcast 2.0. This time thewindow had a menubar, patchbay, console, and transport control. Broadcast 2.0 still only handled audio but this time it handledunlimited tracks, and it could perform effects on audio and save theresulting waveform to disk. More notably a few effects could beperformed as the audio was playing back, in realtime. A user could mixunlimited numbers of tracks, adjust fade, pan, and EQ, and hear theresult instantly. Amazingly this real time tweaking is stillunavailable on most audio programs.
Linux became more and more fragmented after corporations adopted it. Threading once worked the same on all derivatives. Today there are morethreading models than days of the week. We try to focus on 1 of themost popular Linux derivatives at any moment. The threading model isported to that Linux derivative shortly before a release, but Linuxderivatives quickly evolve to new threading models and everythingbreaks.
Also, there is no consistent behaviour for sound and video drivers. Thesituation with video capture has improved in that modern video sourcescan all be mounted like disk drives. The audio capture drivers havebeen a bit more reliable.
The Cinelerra package contains Cinelerra and most of the librariesneeded to run it. We try to include all the dependancies because ofthe difficulty in tracking down the right versions. Also included aresome utilities for handling files. The following are the generalcontents of all Cinelerra packages.
Because of the variety of uses, Cinelerra cannot be run optimallywithout some intimate configuration for your specific needs. Very fewparameters are adjustible at compile time. Runtime configuration isthe only option for most configuration because of the multitude ofparameters.
In UNIX derivatives, environment variables are global variables in theshell which all applications can read. They are set with a commandlike set VARIABLE=value. All the environment variables can beviewed with a command like env. Cinelerra recognizes the followingenvironment variables:
The audio drivers are used for both recording and playback to get datato and from the hardware. Since the same drivers are used for bothrecording and playback, their functionality is described here in aseparate section. The most tested driver is ALSA.
This was the first Linux sound driver. It had an open sourceimplementation and a commercial implementation with more sound cardssupported. It was the standard sound driver up to linux 2.4. It stillis the only sound driver which an i386 binary can use when running onan x86_64 system.
The audio drivers are used for both recording and playback to get datato and from the hardware. Since the same drivers are used for bothrecording and playback, their functionality is described here in aseparate section.
The most powerful video playback method is OpenGL but support iscompletely hardware dependent. Although the OpenGL API was originallysupposed to be hardware independent, it only ended up getting supportedby NVidia with other brands moving to OpenCL or Vulcan.
Today, the rendering as well as the playback can be done in OpenGL. Itrelies on PBuffers and shaders to do video rendering. The graphicsdriver must support OpenGL 2 and Cinelerra needs to be explicitelycompiled with OpenGL 2 support. This requires compiling it on a systemwith the OpenGL 2 headers.
To get the most acceleration, OpenGL-enabled effects must be placedafter software-only effects. All rendering before the lastsoftware-only effect is done in software. The core operations likecamera and projector are of course OpenGL.
This is a method for playing motion JPEG-A files directly to acomposite analog signal. It uses a popular hack of the Video4Linux 1driver from 2000 to decompress JPEG in hardware. Sadly, even thoughanalog output is largely obsolete, newer drivers have replaced BUZ.
For playing audio, small fragments of sound are read from disk andprocessed in a virtual console sequentially. A larger value herecauses more latency when you change mixing parameters but gives morereliable playback.
A good way of ensuring high quality playback was to read biggerfragments from the disk and break them into smaller fragments for thesoundcard. That changed when the virtual console moved from the pushmodel to the pull model. Since different stages of the renderingpipeline can change the rate of the incoming data, it would now be realhard to disconnect size of the console fragments from the size of thefragments read from disk.
The easiest way to set the audio offset is to create a timeline with 1video track and one audio track. Expand the audio track and center theaudio pan. The frame rate should be something over 24fps and thesampling rate should be over 32000. The frame size should be smallenough for your computer to render it at the full framerate. Highlighta region of the timeline starting at 10 seconds and ending at 20seconds. Drop a gradient effect on the video track and configureit to be clearly visible. Drop a synthesizer effect on the audioand configure it to be clearly audible.
There are many sound drivers for Linux. This allows selecting onesound driver and setting parameters specific to it. The sound driversand their parameters are described in the sound driver section. See AUDIO DRIVERS.
This uses nearest neighbor interpolation when scaling in software. Produces jagged edges and uneven motion but it can extract higherresolution when downscaling video in a multiple of pixels. A commontrick is downscaling 4k to 2k using LOW QUALITY.
The Quicktime decoder can handle DVD sources better when this is around10000000. This reduces the amount of seeking required. Unfortunatelywhen reading high bitrate sources from a hard drive, this tends to slowit down. For normal use this should be 0.
DVD IFO files usually contain subtitle tracks. These must be decodedwith by the MPEG decoder. Select Enable subtitles to enablesubtitle decoding. There are usually multiple subtitle tracks startingfrom 0. The subtitle track to be decoded for all MPEG streams goes inthe DVD subtitlee to display text box. Go to the asset correspondingto the MPEG file in the Resources window and right click. Click onInfo. The number of subtitle tracks is given at the bottom.
Enables white balancing for CR2/CR3 images. This has gone from beingmandatory to optional when interpolating as libraries have evolved. Itoriginally required diabolical hacks to dcraw but seems to work properlyin the current libraw version.
The parameters here affect what happens when you go toFile->Record.... The intention was to make File->Record... goas fast as possible into the record monitoring window, without alengthy dialog to configure the file format. Instead the file formatfor recording is set here and it is applied to all recordings. Alsoset here is the hardware for recording, since the hardware determinesthe supported file format in most cases.
This determines the output file format for recordings. It dependsheavily on the type of driver used. The interface is the same as therendering interface. The Record audio tracks toggle must beenabled to record audio. The Record video tracks toggle must beenabled to record video. The wrench button left of each toggle opens aconfiguration dialog to set the codec corresponding to audio andvideo. The audio and video is wrapped in a wrapper defined by theFile Format menu. Different wrappers may record audio only, videoonly, or both.
Some video drivers can only record to a certain wrapper. DV, forexample, can only record to Quicktime with DV as the video compression.If the video driver is changed, the file format may be updated to givethe supported output. If you change the file format to an unsupportedformat, it may not work with the video driver.
This is used for recording audio in the Record window. It may beshared with the Record Driver for video if the audio and video arewrapped in the same stream. It takes variable parameters depending onthe driver. The parameters have the same meaning as they do forplayback.
Audio is first read in small fragments from the device. Many smallfragments are combined into a large fragment before writing to disk. The disk writing process is done in a different thread. The value heredetermines how large the combination of fragments is for each diskwrite.
This is used for recording video in the Record window. It may beshared with the Record Driver for audio if the audio and video arewrapped in the same stream. It takes variable parameters depending onthe driver. The parameters have the same meaning as they do forplayback.
For high bitrate recording the drives may be fast enough to store thedata but Linux may wait several minutes and stall as it writes severalminutes of data at a time. This forces Linux to flush its buffersevery second instead of every few minutes and produce slightly betterrealtime behavior.
The aspect ratio for the recording monitor is determined by the settingfor auto aspect in Settings->set format. If auto aspect isenabled, the recording monitor shows square pixels. If auto aspect isdisabled, the recording monitor stretches the captured frame to theaspect ratio in Settings->set format.
To speed up rendering, several assets are kept open simultaneously.This determines how many are kept open. A number too large may exhaustyour memory pretty fast and result in a crash. A number too small mayresult in slow playback as assets need to be reopened more frequently.
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