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• Methods For Retaining State

  26 décembre 2011, par Multimedia Mike — General, evernote, organization

  I jump around between projects. A lot. Over the years, I have employed various methods for retaining state or context as I switch to a different project. Here’s a quick survey and a general classification of their effectiveness.

  Good

  • Evernote : This is a cloud-based note-taking service that has a web client, Mac and Windows clients, and clients for just about ever mobile platform out there. I have an account and access it via the web interface as as the Windows, iOS, and Android clients. I really like it.

  
  
  

  Okay

  • Series of text files : I have been doing this for a very long time. I have many little note-filled directories here and there that are consistently migrated to new machines but generally forgotten about. This isn’t a terrible method but can be unwieldy when you work on lots of different machines. I’m still tracking down all these directories and importing them into Evernote.

  Bad

  • Layout of desktop windows : I have a habit of working on one project in a set of windows on one desktop space and another project in a second set of windows in another space, etc. Oh, this makes me shudder just thinking about it, mostly because of living in constant fear of a power failure or some other inadvertent reset (darn you, default config’d Windows Update) that wipes the state clean (sure, all of the work might have been saved, but I was relying on those windows to be set up in just the right manner to remind me of all the things I was working on). These days, I force myself to reboot at least once a week so I can’t get too deep into this habit. When it’s time to change projects, I write up exactly what I was doing and where I left off and stick it in Evernote.
  • Open browser windows : I guess it’s common to have many, many tabs open in one’s web browser in this day and age. Like many, I use open tabs as a stack of items to read. The state problem comes when a few of the open tabs represent TODO items. Then I start living in fear that the browser might crash or be restarted in an unexpected way and I struggle to recall what 3-5 important TODO items were that I had opened in separate tabs (on top of a stack of less important items). Again, I try to shut down the browser frequently in order to break this tendency. TODO items are better filed in Evernote.
  • Unsaved data in a text editor : Okay, this is just sloppy on my part, shoving temporary data into a text editor window thinking it’s supremely ephemeral. The problem comes when it’s linked to one of the many tasks on my desktop that might be bumped down a few priority levels ; when finally returning to the context-free data, I’m at a loss to explain what it’s for. Evernote gets it, once more, with a more thorough description of what was going on.
  • Email inbox : I make an effort to ensure that my email inbox has the fewest number of messages possible. Once things are dealt with, they get filed away elsewhere. This implies that things in my inbox require action. Some things have a habit of hanging around, though. Longer items now get described in better detail and filed away in Evernote.
  • Classic paper : Thanks to Derek in the comments for reminding me of this one. Paper is a reliable standby but it can get unwieldy when Post-It Notes litter your work area. Further, it can be problematic when you have multiple physical work areas.
  • Shell history : Another method I rely on entirely too often. This is when I count on a recipe of command line incantations living on in the history buffer of my Unix shell (generally Bash). What sequence of git commands allowed me to do XYZ ? Let’s check the shell history– I sure hope it’s still in there.

  Conclusion
  I guess what I’m trying to say here is that I really like Evernote. If you have similar troubles with retaining state, try it out. I hear there are many other services similar to it with slightly varying feature sets (people rave about Microsoft OneNote). So there are plenty of options and something out there is surely a fit.

  Evernote has a free tier and a premium tier. For my meager note-taking needs, I don’t come anywhere close to the free tier’s limit but I decided to pay for a premium subscription simply because I feel like I derive so much value from the service.

  One downside, however, is that I seem to be doing a lot less blogging since I got on Evernote earlier this year (though it is where I author most of these posts nowadays ; I especially like that I have a notebook labeled “Posted” whose incrementing count reminds me that I am getting some stuff out there). I originally started this blog as a sort of technical journal in order to organize notes and projects in a central location. It’s strange to think that if Evernote existed in 2005, I might never have had a reason to start this blog.

• anyone had success with OpenFP ? [closed]

  30 mai 2013, par Robert Shaw

  http://sourceforge.net/projects/open-fp/

  Built and ran openfp - a sound fingerprinting project available in many places. Includes :
  openfp_extract (calls ffmpeg) _server and _match.

  Hours today fiddling with the samples but I always get MATCH RESULTS 0, even with identical afp files in the signatures directory. What is the trick to get a match ?

  Usings PCM 16 mono 22kHz . Do endian and signed matter as long as its always the same ?

  I hope to try and match bird or animal sounds, anybody think it can work ?

  Thanks in advance ! - Robert

• ffmpeg : images to 29.97fps mpeg2, audio not sync [migrated]

  21 novembre 2011, par Andy Le

  I have spent a lot of time on this issue. Hope someone can help.

  I want to convert 3147 images + ac3 audio file into an mpeg2 video at 29.97fps (about 1m45s). My command :

  ~/ffmpeg/ffmpeg/ffmpeg -loop_input -t 105 -i v%4d.tga -i final.ac3 -vcodec mpeg2video -qscale 1 -s 400x400 -r 30000/1001 -acodec copy -y out.mpeg 2> out.txt

  However, the audio file ends before the frame sequence. Which means the video is slower then audio.

  I checked the output file with imageinfo and see :

  General
  
  Complete name                    : out.mpeg
  
  Format                           : MPEG-PS
  
  File size                        : 7.18 MiB
  
  Duration                         : 1mn 44s
  
  Overall bit rate                 : 574 Kbps
  
  
  
  Video
  
  ID                               : 224 (0xE0)
  
  Format                           : MPEG Video
  
  Format version                   : Version 2
  
  Format profile                   : Main@Main
  
  Format settings, BVOP            : No
  
  Format settings, Matrix          : Default
  
  Format_Settings_GOP              : M=1, N=12
  
  Duration                         : 1mn 44s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 103 Kbps
  
  Width                            : 400 pixels
  
  Height                           : 400 pixels
  
  Display aspect ratio             : 1.000
  
  Frame rate                       : 29.970 fps
  
  Resolution                       : 8 bits
  
  Colorimetry                      : 4:2:0
  
  Scan type                        : Progressive
  
  Bits/(Pixel*Frame)               : 0.021
  
  Stream size                      : 1.29 MiB (18%)
  
  
  
  Audio
  
  ID                               : 128 (0x80)
  
  Format                           : AC-3
  
  Format/Info                      : Audio Coding 3
  
  Duration                         : 1mn 44s
  
  Bit rate mode                    : Constant
  
  Bit rate                         : 448 Kbps
  
  Channel(s)                       : 6 channels
  
  Channel positions                : Front: L C R, Side: L R, LFE
  
  Sampling rate                    : 44.1 KHz
  
  Stream size                      : 5.61 MiB (78%)

  The log from ffmpeg shows many duplicate frames. But I don't know how to get rid of that.

  -loop_input is deprecated, use -loop 1
  
  [image2 @ 0x9c17a80] max_analyze_duration 5000000 reached at 5000000
  
  Input #0, image2, from 'v%4d.tga':
  
    Duration: 00:02:05.88, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: targa, bgr24, 400x400, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  -loop_input is deprecated, use -loop 1
  
  [ac3 @ 0x9ca5420] max_analyze_duration 5000000 reached at 5014400
  
  [ac3 @ 0x9ca5420] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, ac3, from 'Final.ac3':
  
    Duration: 00:20:10.68, start: 0.000000, bitrate: 447 kb/s
  
      Stream #1:0: Audio: ac3, 44100 Hz, 5.1(side), s16, 448 kb/s
  
  Incompatible pixel format 'bgr24' for codec 'mpeg2video', auto-selecting format 'yuv420p'
  
  [buffer @ 0x9c1e060] w:400 h:400 pixfmt:bgr24 tb:1/1000000 sar:0/1 sws_param:
  
  [buffersink @ 0x9dd56c0] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x9c178e0] w:400 h:400 fmt:bgr24 -> w:400 h:400 fmt:yuv420p flags:0x4
  
  [mpeg @ 0x9d58060] VBV buffer size not set, muxing may fail
  
  Output #0, mpeg, to 'out.mpeg':
  
    Metadata:
  
      encoder         : Lavf53.21.0
  
      Stream #0:0: Video: mpeg2video, yuv420p, 400x400, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0:1: Audio: ac3, 44100 Hz, 5.1(side), 448 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (targa -> mpeg2video)
  
    Stream #1:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  267 fps=  0 q=1.0 size=     564kB time=00:00:08.87 bitrate= 520.6kbits/s dup=43 drop=0    
  
  frame=  544 fps=542 q=1.0 size=    1186kB time=00:00:18.11 bitrate= 536.2kbits/s dup=89 drop=0    
  
  frame=  821 fps=546 q=1.0 size=    1818kB time=00:00:27.36 bitrate= 544.3kbits/s dup=135 drop=0    
  
  frame= 1098 fps=548 q=1.0 size=    2444kB time=00:00:36.60 bitrate= 547.0kbits/s dup=181 drop=0    
  
  frame= 1376 fps=549 q=1.0 size=    3072kB time=00:00:45.87 bitrate= 548.5kbits/s dup=227 drop=0    
  
  frame= 1653 fps=550 q=1.0 size=    3700kB time=00:00:55.12 bitrate= 549.9kbits/s dup=273 drop=0    
  
  frame= 1930 fps=550 q=1.0 size=    4326kB time=00:01:04.36 bitrate= 550.6kbits/s dup=319 drop=0    
  
  frame= 2208 fps=551 q=1.0 size=    4960kB time=00:01:13.64 bitrate= 551.8kbits/s dup=365 drop=0    
  
  frame= 2462 fps=546 q=1.0 size=    5746kB time=00:01:22.11 bitrate= 573.2kbits/s dup=407 drop=0    
  
  frame= 2728 fps=544 q=1.0 size=    6354kB time=00:01:30.99 bitrate= 572.1kbits/s dup=451 drop=0    
  
  frame= 3007 fps=545 q=1.0 size=    6980kB time=00:01:40.28 bitrate= 570.2kbits/s dup=498 drop=0    
  
  frame= 3146 fps=546 q=1.0 Lsize=    7352kB time=00:01:44.93 bitrate= 573.9kbits/s dup=521 drop=0    
  
  
  
  video:1518kB audio:5745kB global headers:0kB muxing overhead 1.230493%