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• Launch Leech and the History of WMV

  14 septembre 2010, par Multimedia Mike — General

  I was combing through my programming archives again and came across an old Perl script called launch-leech.pl. This was a private script I used to maintain for the benefit of myself and a few friends. See, there was this site called Launch.com (URL doesn’t seem to do anything as of this writing but here’s the Wikipedia page). Purchased by Yahoo ! in 2001, Launch still maintained their independent branding. They also carried a lot of music videos, of which I am a huge junkie. launch-leech.pl was the tool I used to download the videos. This was particularly useful since I stubbornly clung to dialup internet access until mid-2004 and it would have been impossible to stream video at any decent quality (though there were 56k streams, so like I said– not possible at any decent quality).

  
  
  

  Technically
  I followed Launch.com for many years. To be honest, I only “followed” in that I figured out where their “latest videos” URL lived and regularly polled it. Each video had either a 6-, 7-, or 8-digit unique ID that could be plugged into the launch-leech.pl script which would then have a conversation with the relevant servers, determine the correct streaming URL with the highest quality, then download and save the URL by handing it off to an external program (first ASFRecorder, though I later switched to mmsclient).

  At one point, I even wrote a crawler that compiled an offline database of all the videos, their IDs and their metadata. I never thought of anything interesting to do with it, though.

  
  
  

  Windows Media Legacy
  During these glory days of leeching, Launch.com streamed using Windows Media. I admit, it’s a bit of a blur now — the site might have used Real or QuickTime, but I was obviously most in tune with the WM side. I remember when I first found the site circa 2000-2001, the videos were in MS MPEG-4v3, and the high quality bitrate was 300 kbits/sec. Eventually, Launch.com would stream WMV7, WMV8, and finally WMV9, with bitrates up to 700 kbits/sec. However, they never broke free of the 320×240 encoding resolution, which was frustrating. When I wasn’t able to notice any substantial difference between 300 and 700 kbits/sec, I felt it might be time to put those extra bits to work on a resolution upgrade.

  At least they were nice enough to re-encode a number of old videos using better codecs and bitrates with each revision, thus prompting me to scan through the site collecting updated video IDs for download.

  
  
  

  Epilogue
  I don’t clearly remember when I stopped visiting Launch.com. Video-wise, the web has been a blur of Flash video ever since about 2006. Meanwhile, I spent a lot of time collecting a bunch of music videos in the first half of the decade only to find that pretty much every version of every music video made since the dawn of time is available on demand thanks to YouTube. I have found that this phenomenon manifests in many areas as internet technology marches on.

  The Real Entertainment
  The launch-leech.pl tool represents a recurring pattern for me. I derive as much — if not more — entertainment from creating programs like launch-leech.pl (and implicitly reverse engineering something in the process ; in this case, a website) as I do from the intended entertainment media itself. I seem to have this issue a lot with games, too.

  Is this an issue for anyone else ? Am I the only one who would rather play with the box that a shiny toy comes packaged in ?

• "ffplay.exe has stopped working” during live video streaming from CMD for windows 7

  19 janvier 2019, par M. D. P

  "ffplay.exe has stopped working” during live video streaming from CMD for windows 7. my ffplay command on CMD is :

  C:\User>ffplay -f dshow -i video="Integrated Webcam"

  help me out for this problem. what i think is there is dependency problem or some missing libraries.is there proper solution for this issue ????

  error report :

  

  C:\Users>ffplay -f dshow -i video="Integrated Webcam"
  
  ffplay version N-89127-g8f4702a93f Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  3.103 / 58.  3.103
  
    libavformat    58.  2.100 / 58.  2.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  2.100 /  7.  2.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100

  also tried this :

  C:\Users>ffplay -f dshow -rtbufsize 64M -i video="Integrated Webcam" -t 3600 -report

  still i got same error.

• Invalid data found when processing input from rtsp stream

  5 septembre 2019, par Jeremi Sharkboy

  im trying to playe rtsp stream with ffplay by this command :

  ffplay -i rtsp://HOST:1235/qc/Ks3Al3nVHPOt5F -fflags nobuffer -flags low_delay -an -framedrop

  or

  ffplay -i rtsp://HOST:1235/qc/Ks3Al3nVHPOt5F

  But i got an error

  C:\Users\Administrator\Desktop\QuadroCam\ffmpeg>ffplay rtsp://HOST:1235/qc/
  
  Ks3Al3nVHPOt5F
  
  ffplay version 4.1 Copyright (c) 2003-2018 the FFmpeg developers
  
    built with gcc 8.2.1 (GCC) 20181017
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3
  
   --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libas
  
  s --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenco
  
  re-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enab
  
  le-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libt
  
  wolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --e
  
  nable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --en
  
  able-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable
  
  -libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --
  
  enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --e
  
  nable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  rtsp://HOST:1235/qc/Ks3Al3nVHPOt5F: Invalid data found when processing inpu
  
  t
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

  Maybe need some extra arg for this command or something. Any help please ?