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• How to convert audio stream from PureTool/CVS video ?

  1er janvier 2013, par Mark

  I apologize if there is a better place to post this. I recently came across a couple CVS single-use video cameras that I had been using back in 2005. I still have the USB cable I made and now that I've switched to Mac I can use Puretool to extract the old videos from the cameras. The problem I'm having is that I can only hear the audio when viewing the videos with VLC media player. I read on PureTools site, a common problem is that the audio codec used is incompatible with Quicktime and the audio stream needs to be converted. There is a link on their site to a program called FixSound which is purported to fix this, but the link is dead and I've been unable to find any further information about this. If anyone could point me in the right direction, I'd be very grateful. All the videos I'm dealing with are from the first year of my son's life and I'd really like to be able to archive them in a more uniform format. I would think this would be possible to do using Adobe Audition or some other program in Adobe's CS6 Master Collection but I've only dealt with Photoshop, Illustrator, Dreamweaver, Flash & Fireworks. I have no experience with audio or video yet.

  Thanks,

  Mark

• Can't record S-Video with avconv

  16 avril 2014, par Ertain

  I've been trying to record feed from my S-Video cable using avconv. I am able to record composite video with avconv, but the quality isn't the best. To set the input, I use v4l2-ctl -i $n, where $n is either 0 for composite, or 1 for S-Video. I tried to use v4l2-ctl -i 1 to set the input, but that doesn't work. Oddly enough, when I use tvtime or qv4l2 I can view the video.

  I am able to record audio, just not the video. In tvtime I can get audio as well as video. Also, I was able to record the S-Video with ffmpeg using the -channel option. ffmpeg, btw, can't record the audio, and recording the separate audio isn't an option.

  Edit : as per Anton's request, here's the command I use to capture video with avconv.

  avconv -f video4linux2 -i /dev/video0 -f alsa -i hw:2,0 -vcodec mpeg4 -vtag xvid -b 8000k -r 30000/1001 -acodec \
  
  libmp3lame -ar 48000 -ac 2 -ab 192k -aspect 16:9 -vf yadif=0,scale=1200:800 -y test.avi

  And here's the output from this command :

  avconv version 0.8.6-6:0.8.6-0ubuntu0.12.10.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:02:16 with gcc 4.7.2
  
  [video4linux2 @ 0x982340] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, video4linux2, from '/dev/video0':
  
    Duration: N/A, start: 1368113780.210591, bitrate: 165722 kb/s
  
     Stream #0.0: Video: rawvideo, yuyv422, 720x480, 165722 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
  
  [alsa @ 0x982ba0] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, alsa, from 'hw:2,0':
  
    Duration: N/A, start: 854.715783, bitrate: N/A
  
      Stream #1.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  Incompatible pixel format 'yuyv422' for codec 'mpeg4', auto-selecting format 'yuv420p'
  
  [buffer @ 0x9930a0] w:720 h:480 pixfmt:yuyv422
  
  [yadif @ 0x997960] mode:0 parity:-1 auto_enable:0
  
  [yadif @ 0x997960] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'Parsed filter 0 yadif'
  
  [scale @ 0x985a80] w:720 h:480 fmt:yuyv422 -> w:720 h:480 fmt:yuv420p flags:0x4
  
  [scale @ 0x998000] w:720 h:480 fmt:yuv420p -> w:1200 h:800 fmt:yuv420p flags:0x4
  
  Output #0, avi, to 'test.avi':
  
    Metadata:
  
      ISFT            : Lavf53.21.1
  
      Stream #0.0: Video: mpeg4, yuv420p, 1200x800 [PAR 32:27 DAR 16:9], q=2-31, 8000 kb/s, 29.97 tbn, 29.97 tbc
  
      Stream #0.1: Audio: libmp3lame, 48000 Hz, 2 channels, s16, 192 kb/s
  
  Stream mapping:
  
        Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
        Stream #1:0 -> #0:1 (pcm_s16le -> libmp3lame)

• Disconnect Network Xcode app crash

  15 novembre 2013, par Igor Malasevschi

  I am using ffmpeg library for publishing Video and Audio Live Streaming to the rtmp server.
  I work under MacOS (in Xcode), for capturing I use Qtkit framework.

  As example i consulted the open source app QTFFmpeg : https://github.com/BigHillSoftware/QTFFmpeg

  The main issue is : while i disconnect network cable application crash.
  For encode and stream i use AVFormatСontext.

  Callback for video is :

   -(void)captureOutput:(QTCaptureOutput*)captureOutput  didOutputVideoFrame:(CVImageBufferRef)videoFrame
  
  withSampleBuffer:(QTSampleBuffer*)sampleBuffer   fromConnection:(QTCaptureConnection*)connection
  
  
  
  
  
  
  
  returnval  = av_interleaved_write_frame(avFormatContext, &avPacket);
  
  if (returnVal != 0)
  
    { Never Happens   !!!! }

  Started debug and application crahs on :0 mach_msg_trap.

  Please help me to solve the issue.
  IF you are able to download the source and try to debug without network will be very good.

  Thank You,
  Igor