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• How to overlay images sequence from pipe over a video stream with ffmpeg?

  7 June 2018, by Dotan Simha

  I’m trying to figure out an issue with ffmpeg.
  I have the following installation:
   DeckLink Mini Recorder Card (for HDMI input)
   DeckLink Mini Monitor Card (for HDMI output)

  I’ve successfully managed to take the HDMI input from the Decklink card and output is as-is to the output card with the following command:

  ffmpeg -f decklink -video_input hdmi -raw_format yuv422p10 -i "DeckLink Mini Recorder" -f decklink -pix_fmt uyvy422 "DeckLink Mini Monitor"

  I tried to add a complex-filter to add an overlay of an image, with the following command, and it works:

  ffmpeg -f decklink -video_input hdmi -raw_format yuv422p10 -i "DeckLink Mini Recorder" -i ./tools/bin/windows/2.png -y -filter_complex "[0:1][1:0]overlay=10:10" -f decklink -pix_fmt uyvy422 "DeckLink Mini Monitor"

  I’m getting a realtime feed from the decklink recorder, the image is added to the stream, and it outputs it to the output HDMI card. Everything seems to work.

  Now I tried to change the static image path to use stdin (pipe:0), and I have a tool that constantly streaming PNG images to stdout:

  ffmpeg -f decklink -video_input hdmi -raw_format yuv422p10 -i "DeckLink Mini Recorder" -i pipe:0 -y -filter_complex "[0:1][1:0]overlay=10:10" -f decklink -pix_fmt uyvy422 "DeckLink Mini Monitor"

  The result that i’m getting on the output HDMI card is a static image, of the first frame.
  The output of ffmpeg also changes now, and it looks like it stuck of the first-second of the stream:

  ```
  frame= 30 fps=7.4 q=-0.0 size=N/A time=00:00:01.00 bitrate=N/A speed=0.247x

  frames: 30,
  currentFps: 7,
  currentKbps: NaN,
  targetSize: NaN,
  timemark: ’00:00:01.00’
  ```

  It just remains on 00:00:01.00 and never changes.

  I tried to find the issue, and did the following:

  • Tried to stream Decklink Recorder -> static png file overlay -> Decklink Monitor = IS WORKS

  • Tried to stream static png file -> Decklink Monitor = IS WORKS

  • Tried to stream pipe:0 (PNG files) -> Decklink Monitor = IS WORKS

  • Tried to stream Decklink Recorder -> pipe:0 (PNG files overlay) -> RAW AVI file IS WORKS

  The only issue is with:
   Tried to stream Decklink Recorder -> pipe:0 (PNG files) overlay -> Decklink Monitor DOES NOT WORK

  I suspect that Decklink output is more strict, and my pipe:0 with the PNG images is not stable, and the combination of both causes it to freeze.

  Any idea how to solve it? :(

  Thanks!

• FFMPEG: change input without stoping proccess

  10 July 2018, by admin883

  how i can change input on ffmpeg without stop process on linux Debian 9?
  im user decklink input and i need to change to file mp4 input.

  ffmpeg -f decklink -i 'DeckLink Mini Recorder' -vf setpts=PTS-STARTPTS -pix_fmt uyvy422 -s 1920x1080 -r 25000/1000 -f decklink 'DeckLink Mini Monitor'

• Merge commit ’d78fd2fa21cde28465e40dd0be4446b1387d22a6’

  14 July 2016, by Clément Bœsch

  Merge commit ’d78fd2fa21cde28465e40dd0be4446b1387d22a6’
  * commit ’d78fd2fa21cde28465e40dd0be4446b1387d22a6’:
  
    Add MagicYUV decoder
  Changes observed from Libav:
  
   many cosmetics (function renames/move, spacing, line breaks)
  
   MagicYUVContext.slices_size is now unsigned
  
   use of pixdesc (include fixed in FFmpeg)
  
   mention of "Lossless" in the long name dropped (also removed from
  
    general.texi in FFmpeg)
  
   addition of the FF_CODEC_CAP_INIT_THREADSAFE caps
  
   use of qsort() instead of AV_QSORT() (NOT MERGED)
  
   use of AVCodecContext.width,height instead of AVCodecContext.coded_width,height (NOT MERGED)
  See also 77f9c4b7aa9eb793b3019025e177245896821816
  Merged-by: Clément Bœsch <u@pkh.me>
  

  • [DH] doc/general.texi
  • [DH] libavcodec/codec_desc.c
  • [DH] libavcodec/magicyuv.c