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• avcodec/rpza : Perform pointer advance and checks before using the pointers

  22 août 2013, par Michael Niedermayer

  avcodec/rpza : Perform pointer advance and checks before using the pointers
  Fixes out of array accesses
  
  Fixes Ticket2850
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/rpza.c

• ffmpeg capture for usb v4l2 card

  8 décembre 2020, par elbarna

  I have a Grabby Terratec USB card.

  


  Bus 001 Device 006: ID 0ccd:10af TerraTec Electronic GmbH Terratec G1


  


  With mencoder I capture fine video and audio using a script like this one

  


  #!/bin/sh
#script for capture
#settings for pal 25 fps 720:576 normid=5
#settings for ntsc 30000/1001 fps normid 0 720:480
#settings for INPUT,0=composite,1=s-video,but depend on card

TITLE="MYMOVIE"
CROP="612:467:16:1"
SCALE="560:432"
DEVVID=0
INPUT=1
ADEVICE=hw.2,0
NORMID=5
WIDTH=640
HEIGHT=480
FPS=25
AUDIORATE=48000
ASPECT=4/3
VFS="yadif,crop=$CROP,scale=$SCALE,harddup"

mencoder tv:// -tv driver=v4l2:normid=$NORMID:width=$WIDTH:height=$HEIGHT:device=/dev/video$DEVVID:input=$INPUT:fps=$FPS:alsa:adevice=$ADEVICE:audiorate=${AUDIORATE}:amode=1:forceaudio:immediatemode=0 -of mpeg -mpegopts format=dvd -oac lavc -ovc lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=8000:vbitrate=6000:keyint=15:acodec=ac3:abitrate=320 -aspect $ASPECT -vf $VFS -o "$TITLE".mpg


  


  The script capture audio because this line is present

  


  :amode=1:forceaudio:immediatemode=0


  


  Now the problem, I want to capture using ffmpeg with libx265 and aac

  


  #!/bin/sh
SCALE=528:400
CROP=616:471:14:0
ASPECT=4:3
TITLE="MYTITLE"

#usbstream:CARD=Generic
#    HD-Audio Generic
#    USB Stream Output
#sysdefault:CARD=G1
#    Terratec G1, USB Audio
#    Default Audio Device
#front:CARD=G1,DEV=0
#    Terratec G1, USB Audio
#    Front output / input
#usbstream:CARD=G1
#    Terratec G1
#    USB Stream Output

ffmpeg -y -f video4linux2 -i /dev/video0  -thread_queue_size 512 -f alsa -i hw:CARD=G1 -ac 2 -vf yadif,crop=$CROP,scale=$SCALE -c:v libx265 -c:a aac -b:v 1200k -b:a 320k -metadata language=eng -metadata title="Mymovie" -aspect $ASPECT "$TITLE".mkv


  


  The problem is.. video is captured but without audio, I have tried the line

  


   -f alsa -i hw:CARD=G1


  


  and

  


   -f alsa -i hw:CARD=G1,DEV=0


  


  and

  


   -f alsa -i hw:2,0


  


  But no way. The option " :amode=1:forceaudio:immediatemode=0" doesn't exist on ffmpeg.
Any suggestion ?Thanks

  


• recording live video stream from tv card using ffmpeg in windows

  23 septembre 2015, par user2688423

  I want to capture thumbnail every 1 second from tv card(tv signal) using ffmpeg in windows.

  first of all, to record live video from tv card, I tried below.

  ffmpeg -f dshow -i video="SKYTV HD USB Maxx Video Capture" -r 20 -threads 0 D ://test.mkv

  But it didn’t work.
  the Error message is

  "[dshow@000000000034d920] Could not run filter
  video=SKYTV HD USB Maxx Video Capture : Input/output error"

  I use the device called ’SKYTV HD USB Maxx Video Capture’ for getting tv signal(TV card).

  (people usually suggest "ffmpeg -f oss -i dev/dsp -f video4linux2 -i dev/video0/tmp/out.mpg"
  but I dont think it works at window. this is the error message i got : "Unknown input format: 'video4linux2'")

  what should i do to record live video and get thumbnail every 1 second from tv card(tv signal) using ffmpeg in window ?

  Please help..!