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• Warning in pepeline of stream audio + Video gstreamer

  18 avril 2014, par user3212448

  i use this pepline for stream audio and video from RPI to Windows8
  But i have 2 warning in client and Server ,

  pepeline for client :

  gst-launch-1.0 udpsrc port=5000 ! "application/x-rtp, media=(string)video, \
  
  clock-rate=(int)90000, encoding-name=(string)MP2T, payload=(int)33, ssrc=(uint)4251539348, \
  
   timestamp-offset=(uint)2033210929, seqnum-offset=(uint)34671" ! rtpmp2tdepay \
  
   ! tsparse ! tsdemux  ! "video/x-h264" ! avdec_h264 ! autovideosink 

  Server (RPI)

  gst-launch-1.0 rpicamsrc bitrate=1000000 ! "video/x-h264,width=640,height=480" !\
  
  queue ! h264parse ! queue ! mux.  alsasrc device=hw:1,0 ! audioconvert ! \
  
  lamemp3enc ! "audio/mpeg"! queue !   mux. mpegtsmux name=mux ! queue ! \
  
  udpsink host=192.168.1.9 port=5000 -v 

  Warning client :

  Additional debug info :
  gstrtpbasedepayload.c(381) : gst_rtp_base_depayload_chain () : /GstPipeline:pipeli
  ne0/GstRtpMP2TDepay:rtpmp2tdepay0 :
  Received invalid RTP payload, dropping
  WARNING : from element /GstPipeline:pipeline0/GstRtpMP2TDepay:rtpmp2tdepay0 : Coul
  d not decode stream.

  Warning in RPI

  WARNING : from element /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0 : Can't record audio fast enough
  Additional debug info :
  gstaudiobasesrc.c(848) : gst_audio_base_src_create () : /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0 :
  Dropped 8820 samples. This is most likely because downstream can't keep up and is consuming samples too slowly.

  any one can help me ?
  best regards

• Display formatted date and time over frames using ffmpeg

  28 août 2020, par marcman

  I've gone through a handful of questions on here (this, this, this, etc) concerning overlaying the date and time on videos using ffmpeg, but I haven't been able to figure out the solution.

  


  I personally have found the ffmpeg documentation difficult to parse as well regarding drawing text that updates every (N) frame(s).

  


  I have the exif data from a movie specifying when it was created. I'd like to be able to emblazen that over the movie (as though it were a home video from some old VHS tape). For example, let's say I have a video from January 2, 2012 at 10:33:53. I'd like to be able to show "Jan 2, 2012 10:33:53am" on the lower right in white text. The spatial positioning and color are clear to me, but just how to go from the timestamp information I have to the formatted expansion is proving to be quite difficult for me. I have succeeded in getting a clock starting from 00:00:00.00 and counting up (using timecode and timecode_rate), but unfortunately I can't get much more than that.

  


  My question is : what is the proper datetext command that will allow me to both (a) provide the start time, and (b) format it with the proper expansion.

  


  ---

  


  As a bonus, if you can also point me to how to do this using the wonderful ffmpeg-python library, it would be even better. That library is quite good, but it does not appear to be actively maintained anymore.

  


• ffmpeg's segment_atclocktime cuts at inaccurate times for audio

  3 mai 2023, par Ross Richardson

  I am using ffmpeg's segment format to save files of an AAC stream to disk in hourly segments.
The segmenting works well, but the files are segmented/cut at different times in the clock each hour using segment_atclocktime

  


  I would like each to be exactly on the hour, e.g. 12:00:00, 13:00:00 etc. Or at least, beginning after the hour and not before, e.g. 12:00:00, 13:00:01, 14:00:00 etc.

  


  I am using ffmpeg-python to process the AAC stream and send to two outputs : stdout and these segments.
Here's the code :

  


  out1 = ffmpeg.input(stream, loglevel="panic").output("pipe:",
                                                     format="s16le", 
                                                     acodec="pcm_s16le", 
                                                     ac="1", 
                                                     ar="16000")

out2 = ffmpeg.input(stream, loglevel="info").output("rec/%Y-%m-%d-%H%M%S.aac",
                                                     acodec="copy",
                                                     format="segment",
                                                     segment_time="3600",
                                                     segment_atclocktime="1",
                                                     reset_timestamps="1",
                                                     strftime="1")
            
ffmpeg.merge_outputs(out1, out2)
      .run_async(pipe_stdout=True, overwrite_output=True)


  


  Most files are produced at the desired time : 05:00:00, 06:00:00, 07:00:00, but one or two each day start at 08:59:59 (where 09:00:00 would be desired), or even 16:00:24.

  


  I understand the segment needs to begin on a audio sample so it can't be perfect to the hour, but wondering how I can make it more consistent. Ideally, each hour's recording would begin at 00:00 or later, and not begin before the hour.

  


  I have tried using min_seg_duration 3600, reset_timestamps 1
I am not sure how exactly to use segment_clocktime_wrap_duration for audio, or whether segment_time_delta applies to audio.

  


  I'd appreciate any advice or understanding of how segment_atclocktime works with audio, as much on the internet seems video-focused.