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• How to connect ffmpeg to broadcasted rtsp live camera link feeds to users browser ??? These camera link are dynamic so it cannot be defined initially

  9 décembre 2016, par vibhor Gupta

  The following rtsp link gives me feed :
  rtsp ://user:11111@192...***/MPEG-4ch1/main/avstreams

  The following ffmpeg command helps gets me these feed and i can store it on my server :
  ffmpeg -i rtsp ://user:11111@192...***/MPEG-4ch1/main/avstreams -vcodec copy -acodec copy -f mpegts video.mp4

  But when i use the following command broadcast starts but no streaming is received :
  ffmpeg -i rtsp ://user:11111@192...***/MPEG-4ch1/main/avstreams -vcodec copy -acodec copy -f mpegts udp ://127.0.0.1:7000

  I even checked on the server for 7000 port but nothing is running so i am cannot understand what is going.

  To Check I used vlc and in the network stream option i placed udp ://192.168.1.105:7000 as the network url. but it is not working

  So friends i would like to know where i am going and if possible what can be a better solution for this problem ??

  Thank You

• Input link in1:v0 parameters (size XXX, SAR XXX) do not match the corresponding output link in0:v0 parameters (XXX, SAR 1:1) [duplicate]

  1er mars 2020, par theapache64

  I’ve two files, a mp4 and a mp3 file. I want to add a 3 seconds intro screen with title Welcome and black background to the head of the video with the mp3 as background. So here’s what I wrote.

  ffmpeg \
  
      -i input.mp4 \
  
      -i bgm.mp3 \
  
      -f lavfi -i color=c=black:s="1280"x"544":d=3.0 \
  
      -filter_complex \
  
          "[2:v]
  
    drawtext=
  
      fontsize=30
  
      :fontcolor=white
  
      :x=(w-text_w)/2
  
      :y=(h-text_h)/2
  
      :text='WELCOME',
  
      geq=0:128:128
  
  [introVideo];
  
  
  
  [1:a]
  
      atrim=0.0:3.0
  
  [introAudio];
  
  
  
  [introVideo][introAudio][0:v][0:a]concat=n=2:v=1:a=1" -preset superfast output.mp4

  but am getting below error when I try to execute the command

  [Parsed_concat_3 @ 0x55c02756fa00] Input link in1:v0 parameters (size 1280x544, SAR 1299:1280) do not match the corresponding output link in0:v0 parameters (1280x544, SAR 1:1)
  
  [Parsed_concat_3 @ 0x55c02756fa00] Failed to configure output pad on Parsed_concat_3
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:1
  
  Conversion failed!

  Any help will be highly appreciated.

  PS : I am a beginner in video processing and ffmpeg.

• DirectX12 Video Encoding : output buffer population

  6 janvier 2023, par mike

  I'm attempting to implement DX12 video encoding.

  


  

  • To date I've been using the ffmpeg library so am not very clued up on very low level data.

  


  • I'm using the simplest possible encoding I can think of, with GOP size of 1 and H264

  


  


  I am struggling with the first part of defining the output structure D3D12_VIDEO_ENCODER_ENCODEFRAME_OUTPUT_ARGUMENTS, namely setting up the resource pBuffer in D3D12_VIDEO_ENCODER_COMPRESSED_BITSTREAM :

  


  typedef struct D3D12_VIDEO_ENCODER_COMPRESSED_BITSTREAM {
  ID3D12Resource *pBuffer;
  UINT64         FrameStartOffset;
} D3D12_VIDEO_ENCODER_COMPRESSED_BITSTREAM;


  


  Regards pBuffer, the docs say :

  


  


  "A pointer to a ID3D12Resource containing the compressed bitstream buffer".

  


  


  

  • So I guess I create a buffer at least the size of the input frame + room for header data, and make it writeable - seems like it should be straightforward, but am I missing something ? Should it be multi-planar for example, or be some multiple of input frame size ?
    

  


  


  Then :
  

  


  


  "The output bitstream is expected to contain the subregion headers, but not the picture, sequence, video or other headers. The host is responsible for coding those headers and generating the complete bitstream."
  

  


  


  

  • what do these subregion headers look like ? I am showing my lack of encoding knowledge here in general, is there a resource somewhere explaining how to calculate them ? (or have I misread this, and this is saying the output will contain them)

  


  • do I just write them by copying into mapped memory and setting the FrameStartOffset to point after the header data ?

  


  • I'm currently streaming AVPackets from ffmpeg using libdatachannel, how would the content of the output (without my adding extra headers) compare to an AVPacket->data ?