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• Why am I getting FFMPEG "cannot set sample format 0x10000 2 (Invalid argument)" error ? [duplicate]

  30 mars 2020, par Embedded

  I’m trying to stream audio input from Seeed Studio 4-Mic-Array Respeaker on desired IP address and port on Raspberry Pi 4.

  Command that I’m using is :

  ffmpeg -re -f alsa -i hw:1,0 -ac 4 -ar 16000 -f rtp rtp://10.0.0.1:1234

  Error I’m getting is :

  cannot set sample format 0x10000 2 (Invalid argument)

  Result from arecord --dump-hw-params -D hw:1,0 command is :

  Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
  
  HW Params of device "hw:1,0":
  
  --------------------
  
  ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
  
  FORMAT:  S32_LE
  
  SUBFORMAT:  STD
  
  SAMPLE_BITS: 32
  
  FRAME_BITS: 128
  
  CHANNELS: 4
  
  RATE: [8000 48000]
  
  PERIOD_TIME: (333 2048000]
  
  PERIOD_SIZE: [16 16384]
  
  PERIOD_BYTES: [256 262144]
  
  PERIODS: [2 2048]
  
  BUFFER_TIME: (666 4096000]
  
  BUFFER_SIZE: [32 32768]
  
  BUFFER_BYTES: [512 524288]
  
  TICK_TIME: ALL
  
  --------------------
  
  arecord: set_params:1299: Sample format non available
  
  Available formats:
  
  - S32_LE

• FFMPEG hls event start always from first segment on Android device

  29 juillet 2020, par tidpe

  I've this live streaming server that encode RTMP stream into HLS.
My server is doing something like that :

  


   ffmpeg -re -i rtmp://server:port/address/name -rw_timeout 500 -http_persistent 1 -method PUT -http_user_agent myuseragent -f hls -hls_list_size 5 -hls_flags discont_start+delete_segments+omit_endlist -async 1 -vf "scale=640:trunc(ow/a/2)*2" -movflags +faststart -c:a libfdk_aac -ar 48000 -c:v h264 -profile:v main -crf 24 -sc_threshold 0 -g 48 -keyint_min 48 -hls_time 4 -hls_playlist_type event -preset veryfast -b:v 350k -maxrate 800k -bufsize 1100k -b:a 96k -vcodec libx264 -hls_segment_filename %03d.ts master.m3u8


  


  On desktop all working fine, problem is that on android devices/android native players the live streaming is starting always from begin.

  


  I'm trying to remove segments from playlist, but nothing can work and playlist is starting always from first TS segment.

  


  What I've tried

  


  


  -hls_list_size 5

  


  


  


  -hls_flags delete_segments

  


  


  


  -hls_delete_threshold 2

  


  


• how to use the pts in ffmpeg

  2 décembre 2016, par Allan

  I have a library with can provide video data and PTS. The library head file Like this：

   /**
  
   * \brief           Write mirror video H.264 frame to player.
  
   * \param p_src     Pointer to source buffer.
  
   * \param size      H.264 frame size. (unit: byte)
  
   * \param ptsValue  PTS value.
  
   * \return          Copied size. (unit: byte)
  
   */
  
  int (*WriteMirrorVideoData)(const std::string& ip, const void *p_src, int size, double ptsValue);

  As you see, the library give me video frame buffer address and PTS.

  I use FFMpeg to decode video data correctly.

  My question is how to control the display time by ptsValue which provided by library.

  Did I need to set the ptsValue to AVFrame ? then FFMPeg can control the display time itself.
  Or I need to control the display by my own code ?

  I am a newer to FFMpeg. please help me. Thank you very much !