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• libavcodec/xsubenc.c : Fix bounding box coordinates

  7 novembre 2013, par Erik Olofsson

  libavcodec/xsubenc.c : Fix bounding box coordinates
  Fix coordinates of the lower right corner of the text area.
  
  Note that the coordinates are redundant as the size and
  
  position of the text area are known.
  
  Many decoders (including Sony Playstation 3, VLC and FFmpeg)
  
  ignore the redundant coordinates.
  
  Some hardware decoders need them for correct playback.
  Verified on Philips DVD player models HTS7201 and DVP3380.
  Fixes ticket #3031
  Signed-off-by : Erik Olofsson <eaj.olofsson@gmail.com>
  
  Reviewed-by : Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/xsubenc.c

• ffmpeg usb Web cam recording terminates randomly before set duration

  16 mars 2018, par pomptondrive

  The output of this script is just fine ; it’s pretty much what I want. But it seems to terminate randomly. My next step will be to try this on another computer to see if the issue persists.

  My configuration :
  Dell Precision laptop, m4400
  2x Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
  Linux Mint 18.3 Sylvia
  Kernel : Linux 4.4.0-116-generic (x86_64)
  Card : NVIDIA G96GLM [Quadro FX 770M]
  ffmpeg version 2.8.11-0ubuntu0.16.04.1
  USB Camera-B4.09.24.1 Sony Playstation Eye

  And this is the script that I’m running - the last time it recorded for about three hours and forty-five minutes, before that it was about 55 minutes ; once it ran five and a half hours :

  #!/bin/bash  
  
  echo "This is a shell script to make a timelapse video."  
  
  ffmpeg \
  
  -f v4l2 -input_format yuyv422 -video_size 640x480 -framerate 5 -t 09:00:00 -i /dev/video0 \
  
  -vf "select=not(mod(n\,5)),setpts=N/(60*TB),fps=60, drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf:text='%{localtime\:%T}':x=20:y=20:fontcolor=white" \
  
  -c:v libx264 -preset superfast -crf 23 -pix_fmt yuv422p -g 15 -keyint_min 15 \
  
  -f mpegts /media/dkm/OneTB/Video/Timelapse_$(date +%Y-%m-%d_%H.%M.%S).ts

  Any suggestions would be appreciated. Thanks !

• Cannot find a proper format for codec ‘h264’ (id 28), pixel format ‘none’

  20 avril 2022, par 이중범

  I downloaded jocover’s git hub ffmpeg and compiled it to stream the video to the web on the Jetsonano board
However, i tried

  


  ffmpeg -c:vh264_nvmpi -i /dev/video -f null -


  


  


  Cannot find a proper format for codec ‘h264’ (id 28), pixel format
‘none’ (id-1)

  


  Assertion *codec_id != AV_CODEC_ID_NONE failed at
src/libavdevice/v4l2.c:811

  


  


  I got this error

  


  and I tried ./ffmpeg -encoders |grep 264

  


  As a result of this console, the output is as follows :

  


  


  v… h264_nvmpi nvmpi H.264 encoder wrapper (codec h264)

  


  


  


  v… h264_v4l2m2m V4L2 mem2mem H.264 encoder wrapper (codec h264)

  


  


  


  v… h264_vaapi H.264/AVC (VAAPI) (codec h264)

  


  


  The camera specs are like this maybe Sony IMX219, a model called Raspberry Pi Camera Module V2

  


  


  ioctl : VIDIOC_ENUM_FMT

  


  Index : 0

  


  Type : Video Capture

  


  Pixel Format : ‘RG10’

  


  Name : 10-bit Bayer RGRG/GBGB

  


  


  I’d really appreciate your help

  


  thx