You'll find my escalator requires extra attention today.

Previously, previously, previously, previously, previously, previously, previously, previously, previously.

Tags: , , ,


No shits given for the Star Wars or Avengers trailers, but the Terminator trailer looks promising!

If I were a self-replicating AI, I wouldn't house myself inside some kind of Iron Man turducken, I'd be thousands of spiders. You really haven't thought this through.

Why does Ultron's itty bitty head on his gigantic robot body have its own helmet? Whyyyyyy?? Is he like that bug that impersonates fish tongues?


Tags: , , ,

DNA Lounge: Wherein the halfassery sinks to new depths.

I'm trying something new and stupid with our long-suffering video webcast.

As you may recall, the video webcast has been largely down since shut down. I don't have any good replacement options. I looked at dozens of streaming providers, and except for two, they are all either really expensive, or spam the viewers with commercials all the time. The two services that don't are Streamup and Youtube.

So I was using Streamup, and it sucked, because they're just really, really bad at running their service. Literally weeks of unexplained downtime. Even after I tracked down the actual engineers to talk to and gave them easily reproducible test cases, all I got was, "Huh, that's funny."

Then I tried Youtube, and that's a non-starter because as soon as music starts playing, they Content-ID us, shut down the stream, and threaten hellfire damnation and an airstrike if those DJs don't stop playing other peoples' music right now.

So I got out the duct tape...

The video webcast is now streaming via Youtube, but it's streaming there silently -- video only -- so that their robots have nothing to complain about. Also, the page with the video embed on it has a second embed of our audio player, streaming the audio webcast from the DNA site.

Downside: There's no chance that audio and video will ever be in sync.

Upside: It kinda... sorta... works?

It looks like the audio is between 15 and 25 seconds ahead of the video, but your mileage will surely vary.

"There. I fixed it."


ffmpeg on MacOS with Blackmagic

Things are bleak when ffmpeg might make things BETTER than what you were doing before.

Lazyweb, earn your keep:

How do I get video out of a BlackMagic SDI-to-HDMI 4K MiniConverter using ffmpeg on MacOS?

I installed it like this:

port install ffmpeg +nonfree +librtmp +libdc1394

I gather that the following incantation should list available input devices, but it freaks out halfway through:

ffmpeg -list_devices true -f avfoundation -i dummy

ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
built on Aug 21 2014 20:56:05 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-libdc1394 --enable-librtmp --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfdk-aac --enable-libfaac
libavutil 52. 92.100 / 52. 92.100
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 48.100 / 55. 48.100
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 11.100 / 4. 11.100
libavresample 1. 3. 0 / 1. 3. 0
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[AVFoundation input device @ 0x7f935ac2d3e0] AVFoundation video devices:
[AVFoundation input device @ 0x7f935ac2d3e0] [0] Blackmagic
dummy: Input/output error
Exit 1

My reading of various cargo-cult droppings suggested that my command might look something like:

cmd="ffmpeg -f avfoundation"
cmd="$cmd -i video=Blackmagic"          #
cmd="$cmd -video_size 1280x720"         # input video size
cmd="$cmd -framerate 60"                # input video frame rate
cmd="$cmd -r 15"                        # output video fps
cmd="$cmd -g 30"                        # output motion estimation?
cmd="$cmd -maxrate 350k"                # output video rate
cmd="$cmd -bufsize 700k"                # output video rate
#cmd="$cmd  -rtbufsize 702000k"         # output video rate?
cmd="$cmd -vf scale=640:-1,format=yuv420p"     # output video size
cmd="$cmd -threads 4"                   # tune this?
cmd="$cmd -acodec libmp3lame"           # output audio codec
cmd="$cmd -ac 2"                        # output audio channels
cmd="$cmd -b:a 96k"                     # output audio bps
cmd="$cmd -ar 44100"                    # output audio Hz
cmd="$cmd -vcodec libx264"              # output video codec
cmd="$cmd -crf 23"                      # constant rate factor. 0 = lossless, 18 good, 23 default, 51 worst
cmd="$cmd -preset ultrafast"            # little compression, high bitrate
cmd="$cmd -f mpegts"                    # MPEG-TS packets, CBR MPEG
cmd="$cmd -f flv"
cmd="$cmd rtmp://[REDACTED]"

But that fails:

[avfoundation @ 0x7f8d3b82cc00] Failed to create AV capture input device: Cannot Use Blackmagic
Blackmagic: Input/output error

Also, how do I tell it to take video from Blackmagic but encode silence as audio? Not "no audio stream", but rather, "there is an audio stream and it is silent"?

Also, how do I tell it to take video from Blackmagic but audio from the Mac's built-in analog line-in jack?

Previously, previously, previously.

Tags: , , , , , ,

Aaaaaaaahhhhhh everything is terrible.

Since we still have no video webcast, Streamup continuing to be nonfunctional approximately 100% of the time, I had a stupid idea: I'll webcast silently through Youtube Live, so those pigfuckers won't Content-ID me, and then do audio playback from the MP3 webcast.

Downside: there's not even a remote chance that audio and video will ever be in sync. Upside: by not using Streamup, there's a chance that there might sometimes be any video at all.

But now I can't figure out what the hell I did last time to get video into Youtube at all. FMLE is chugging away, telling me that it has been connected for 26 minutes, but the Youtube "Live Control Room" keeps saying "We are not receiving data from your encoder". FFFFFFFFUUUUUUUU...


Tags: , , ,

  • Previously