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• FFmpeg Live streaming, capture card avisynth/graphedit

  19 décembre 2013, par diegonaranjo

  I´m stuck in a problem with a test doing multicast streaming from a Viewcast Osprey 700e HD using ffmpeg.
  The thing is that I´ve to use avisynth(with graphedit) for ffmpeg recognize the card. The streaming has no ending time,
  is a live channel for IPTV.
  The script is working well, but the problem is the avisynth config, because I have to specify the countframe option,
  i think this is for the duration of the clip, but I need an infinity streaming.

  The is script is :

  ffmpeg -i espnhd.avs -rtbufsize 100000k -r 30 -c:v mpeg2video -b:v 5120k -s 1280x720 -g 100 -q:v 2 -c:a ac3 -b:a 256k -f mpegts udp ://239.192.42.61:1234

  The espnhd.avs file is :

  v=directshowsource("espnhdv.GRF", pixel_type="YUV", framecount=1000000, fps=30, audio=False, convertfps=false)
  A=directshowsource("espnhda.GRF", fps=30, framecount=1000000, video=False, convertfps=false)
  AudioDub(V, A)
  loop()

  When i run the application, work fine but the streaming ends when 1000000 frames it´s encoded...
  If i dont specify framecount, ffmpeg doesn´t start with the following error, can´t determine the duration of the clip.

  Is there any way to specify an inifinity duration on avisynth ?

  The streaming stops at 1:57hs. I took the end fo the logs :

  frame=212014 fps= 30 q=4.0 size= 6957018kB time=01:57:54.13 bitrate=8056.4kbits/s dup=0 drop=211 
  
  frame=212029 fps= 30 q=4.0 size= 6958383kB time=01:57:54.64 bitrate=8057.4kbits/s dup=0 drop=211 
  
  frame=212044 fps= 30 q=4.0 size= 6959504kB time=01:57:55.13 bitrate=8058.1kbits/s dup=0 drop=211 
  
  frame=212060 fps= 30 q=4.0 size= 6960692kB time=01:57:55.66 bitrate=8058.9kbits/s dup=0 drop=211 
  
  espnhd.avs: Not enough space
  
  [output stream 0:0 @ 02f02220] EOF on sink link output stream 0:0:default.
  
  [output stream 0:1 @ 02f10c20] EOF on sink link output stream 0:1:default.
  
  No more output streams to write to, finishing.
  
  frame=212069 fps= 30 q=4.0 Lsize= 6961519kB time=01:57:56.00 bitrate=8059.5kbits/s dup=0 drop=211 
  
  
  
  video:6196482kB audio:221125kB subtitle:0 global headers:0kB muxing overhead 8.475312%
  
  424560 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 02f8c3e0] Statistics: 0 seeks, 4977161 writeouts
  
  [AVIOContext @ 02f032a0] Statistics: 229 bytes read, 0 seeks

  I really appreciate some help.
  Thanks.

• Saving highest quality video from video-capture card

  23 décembre 2013, par DusteD

  I have a machine with 2x3 3ghz dual-core xeon and 4x10krpm scsi 320 disks in raid0.
  The capture card is an osprey 560 64 bit pci card.
  Operating system is currently Windows Server 2003.

  The video-stream that I can open with VLC using direct show is rather nice quality.
  However, trying to save this video-stream without loss of quality has proven quite difficult,
  using the h264 codec I am able to achieve a satisfying quality, however, all 4 cores jump to 100% load after a few second and then it start dropping frames, the machine is not powerful enough for realtime encoding. I've not been able to achieve satisfying mpeg1 or 4 quality, no matter which bitrate I set..

  Thing is, the disks in this machine are pretty fast even by todays standard, and they are bored.. I don't care about disk-usage, I want quality.
  I have searched in vain for a way to pump that beautiful videostream that I see in VLC onto the disk for later encoding, I reckon the disks would be fast enough, or maybe something which would apply a light compression, enough that the disks can keep up, but not so much as to loose visible quality.

  I have tried FFMPEG as it seems capable of streaming a yuv4 stream down to the disk, but ofcause FFMPEG is unable to open the dshow device ( same error as this guy Ffmpeg streaming from capturing device Osprey 450e fails )

  Please recommend a capable and (preferably) software which can do this.

• Using ffmpeg for recording multi audio track and video from decklink card ?

  24 février 2020, par Tuanxter

  I want to use ffmmpeg to record video and audio with multiple audio tracks, I used this command and tried many other ways but the video file has only 1 audio track ? Can someone help me ? Thank very much !
  My command :
  ffmpeg -y -f dshow -video_size 1920x1080 -pixel_format uyvy422 -rtbufsize 152000 -framerate 25 -i video="Decklink Video Capture":audio="Decklink Audio Capture" -codec:v libx264 -pix_fmt yuv420p -preset ultrafast output.mp4 ?