Screencasting Under Linux--A brief Story

My first consideration for making A/V screencasts under Linux is Software. What programs are available to do screen-recordings with simultaneous audio narration under Linux? I've probably tried them all: recordmydesktop (which has both gtk-recordmydesktop and qt-recordmydesktop GUI font ends), Istanbul, xvidcap, and wink. Frankly, none of these yielded the high-quality screen capture I wanted. But the real problem is that the audio quality was worse. After thrashing about, I finally end up with a non open source commercial product called DemoRecorder.
Now DemoRecorder is a commercial, proprietary program, which costs $47.00US, $77.00US, or $247.00US depending on the desired feature set. I purchased the $77.00 license. This does not work under Mandriva 2010 in nested desktop mode, but the openGL mode of capture works well. No dropped frames on the video side, and relativey smooth modion. On the audio side, no major sound glitches like I had with recordmydesktop.
Using DemoRecorder in the openGL mode is a two-phase process--Running the demorec --opengl program to perform the initial capture of the video and audio files, then the transcoding or assembly into a finished product using demorec-to-avi (or demorec-to-dv, demorec-to-flv, demorec-to-mpeg1, demorec-to-mpeg2, demorec-to-ogg-theora or whatever video codec/container you wish).
While the sound quality is considerably improved, it's still a bit hollow and tinny when recorded from my Logitech headset. I found the captured sound file produced by demorecorder, which I could then import into Audacity in raw format. I could then edit and improve the sound in Audacity, and export the edited sound file back to the drive before the assembly/transcoding of the video files and the sound file into one avi file.
This works--still, the sound isn't quite professional quality, but close. The real issue with this is that this type of post-production sound-editing takes a lot of time. Better, if possible, to get a high-quality sound recording to begin with, and bypass the editing step. Time for some research into sound production.
I have no experience in sound recording--I'm a computer guy, but I do like to play with hardware.
Fortunately, I already have a really good high-quality sound card in my working desktop computer--an HT Omega Claro Plus.
Turns out, you can get a decent quality mic, and a device called a sound mixer, and you can record really great sound. Good to know. I end up purchasing a Behringer XENYX 1204FX model mixer for $179.99US. This model of mixer turns out to be overkill on my part, and I now know I could have got by just fine with a cheaper mixer (prices for a mixer can range from $99.00US to several thousand US dollars).
As is often the case, one purchase often begets another. So, on to buy a decent, but relatively inexpensive condensor mike (after shelling out too many $$$ on the mixer). I end up purchasing an MXL 990 condenser microphone with a shock mount for $49.00US. Then a proLine desktop mic stand, model MS112 ($29.99US). Finally, I purchase assorted cables and adapters.
After all my sound gear arrives, I connect the mic to my mixer, the mixer to my sound card. Then I fire up Audacity to run some tests. After fiddling with the gear for about an hour, I'm amazed at the quality of the sound captures. Now I can start recording those educational screencasts in earnest.
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| Debian Installer Bullseye RC 1 releaseThe Debian Installer team[1] is pleased to announce the first release candidate of the installer for Debian 11 "Bullseye". Improvements in this release ============================ * base-installer: - Re-add the removed is_ports_architecture() function - it's used by other packages and library.sh looks like a fair central place for it to be (#979193). * brltty: - Update udev rules. - Make sure the hardening flags are used in the udeb build. * choose-mirror: - Update Mirrors.masterlist. * debian-archive-keyring: - Add bullseye keys, remove jessie keys. * debian-cd: - Shorten "ppc64el" to "p64el" in the volume ID. - Include eatmydata deb for the installer to use offline (#986772). * debian-installer: - Build in libinput instead of evdev driver for the graphical installer. This should improve support for touchpads in particular. - Bump Linux kernel ABI to 5.10.0-6. - Add wireless-regdb-udeb to all Linux arch images (#979104). - Correct keyword for bootloader arguments in netboot/xen/debian.cfg example file (#904131). - Update debian-internals manual to current development state. - Update minimum disk and memory sizes. * debian-installer-utils: - list-devices-linux: Support partitions on USB UAS devices. * espeakup: - Carry over the alsa mixer levels into the installed system. * grub-installer: - Make sure that efivarfs is loaded and the efivars pseudofs is mounted when needed. * grub2: - Add support for SBAT. - grub-install: Fix inverted test for NLS enabled when copying locales (#979754). * installation-report: - bugscript: do not include template in script output (#980929). * libdebian-installer: - Remove the arbitrary limitation on maximum line length in Packages and Sources files (#971946). * libinih: - Add libinih1-udeb for Debian Installer (#981864). * libinput: - Drop libwacom support from the udeb. * libmd: - Add a udeb package needed by libbsd. * libwacom: - Drop the udeb, libinput no longer needs it. * linux: - Add bonding driver to the nic-modules udeb. - Remove efivars from the efi-modules udeb. - arm64: Fix i2c-mv64xxx module name. * localechooser: - Disable Kabyle for the text-based installer, as switching keyboard fails there (#973455). - Correct Kabyle locale definition in languagelist to its real naming. * lowmem: - Delete graphical terminal related files when memory is low (#977490). - 5lowmem: Rename to 05lowmem so that rescue actually overrides it (#870574). - S15lowmem: Update minimum memory sizes. * nano: - Compile the udeb with --without-included-regex to make binaries substantially smaller. * netcfg: - Update testcases to work with current Check API (#980607). - Satisfy GCC pedantry for strncpy() calls. * os-prober: - Probe Microsoft OS on arm64. * partman-btrfs: - Add minimal subvolume support for / (#964818). * partman-efi: - Make sure that efivarfs is loaded and the efivars pseudofs is mounted when needed. * rootskel: - Use /dev/tty0 as a console even if it's not in /proc/consoles. - Do not remove the font when bterm is not started (#977466). * rootskel-gtk: - Switch to Homeworld theme for Debian 11 by Juliette Taka. * user-setup: - Allow underscore in username of first account (#977214). Hardware support changes ======================== * debian-installer: - arm64: Add support for puma-rk3399. - arm64: Update to use u-boot-install-sunxi. - armhf: Make hd-media and netboot sdcard images start at offset 32768, for compatibility with rockchip platforms. - arm64, armhf: Update SD-card-images sizes for netboot, netboot-gtk and hd-media. * flash-kernel: - Add support for Orange Pi One Plus (#981328). - Add support for ROCK Pi 4 (A,B,C). - Add support for Banana Pi BPI-M2-Ultra (#982089). - Add support for Banana Pi BPI-M3 (#981561). - Fix missing ESPRESSObin variants (#969518). - Fix several DTB-Id entries that incorrectly referenced the .dts instead of .dtb file. Localization status =================== * 78 languages are supported in this release. Known bugs in this release ========================== * Broken rescue mode with the graphical installer (#987377). * amdgpu firmware required for many AMD graphic cards. See the errata[2] for details and a full list of known issues. Feedback for this release ========================= We need your help to find bugs and further improve the installer, so please try it. Installation images, and everything else you will need are available at our web site[3]. Thanks ====== The Debian Installer team thanks everybody who has contributed to this release. 1. https://wiki.debian.org/DebianInstaller/Team 2. https://www.debian.org/devel/debian-installer/errata 3. https://www.debian.org/devel/debian-installer ![]() |
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