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• How to solve the incremental delay in ffplay streaming ?

  26 avril 2021, par Nilton Garcia

  Problem : Incremental streaming runtime delay with FFPLAY

  


  Question : Is there a way to clear the delay buffer at run time ?

  


  I'm using FFPLAY to play an RTP stream. In the first few minutes the delay is constant however, after 1h the delay increases by a few milliseconds generating in the end seconds of delayed increases.

  


  I have tested several protocols : SRT, RTP and UDP, RTMP and the behavior is the same with FFPLAY.

  


  Command used to play an RTP audio stream :

  


  ffplay -max_delay 100000 -flags low_delay -probesize 32 -fflags nobuffer+fastseek+flush_packets -analyzeduration 0 -protocol_whitelist file,rtp,udp -i audio.sdp -loglevel info -nodisp


  


  I have tested and made several combinations of flags and so far without success.

  


  Arquivo .SDP

  


  SDP:
v=0
o=- 0 0 IN IP4 10.50.50.14
s=FONTE DE AUDIO
c=IN IP4 10.50.50.14
t=0 0
a=tool:libavformat 58.29.100
m=audio 3029 RTP/AVP 127
b=AS:1536
a=rtpmap:127 L16/32000/2


  


  My version FFPLAY

  


  ffplay version 4.2.2-0york0~18.04 Copyright (c) 2003-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
  configuration: --prefix=/usr --extra-version='0york0~18.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100


  


• ffmpeg stream segmenting loses some frames after initialization

  17 février 2020, par zerociudo

  I use this ffmep command to get stream from usb camera and segment videos of 1 seconds

  ffmpeg -i /dev/video0 -pix_fmt yuv420p -vcodec libx264 \
  
                    -r 15 -x264opts keyint=15:min-keyint=15 -crf 19 \
  
                    -vf drawtext='expansion=strftime:fontfile='/usr/share/fonts/cantarell/Cantarell-Light.otf':fontsize=28:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=1:text='%Y-%m-%d\ %H\\\\:%m\\\\:%S':x=200:y=200'" \
  
                    -f segment -reset_timestamps 1 -segment_time 1 -segment_format mp4 \
  
                    -strftime 1 -map 0 output/%Y-%m-%d-%H:%M:%S.mp4 \

  The output that I get is

  Parsed_drawtext_0 @ 0x5633950a66c0] Using "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
  
  [Parsed_drawtext_0 @ 0x5633950a66c0] expansion=strftime is deprecated.
  
  [libx264 @ 0x5633950a1680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x5633950a1680] profile High, level 3.1
  
  [libx264 @ 0x5633950a1680] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=10 keyint_min=6 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=19.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:14.mp4' for writing
  
  Output #0, segment, to 'output/%Y-%m-%d-%H:%M:%S.mp4':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720, q=-1--1, 10 fps, 10240 tbn, 10 tbc
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:18.mp4' for writing
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:19.mp4' for writing
  
  [segment @ 0x56339509fac0] Opening 'output/2020-02-17-13:39:20.mp4' for writing

  You can clearly see that first video is output/2020-02-17-13:39:14.mp4, then something happens and the next video is output/2020-02-17-13:39:18.mp4. After this I lose 3 seconds and my whole videos are delayed by 3 seconds.

  Is my command incorrect or is there something else could cause it ?

• How to add BGM when pipe opencv images to ffmpeg - python

  23 mars 2020, par karobben

  Basically, I know how to stream by Pipe opencv to ffmpeg using python.
  But my problem is I can’t add an audio file (BGM) for it. Does anyone know how to make it with python ?

  my python code is :

  import cv2 as cv
  
  import subprocess as sp
  
  
  
  # ffmpeg command
  
  
  
  command = ['ffmpeg',
  
          #'-re', '-stream_loop', '-1', 
  
          #'-i', '/home/pi/scrpt/Blive/StarBucks_BGN.mp3',
  
          '-y',
  
          '-f', 'rawvideo',
  
          '-vcodec','rawvideo',
  
          '-pix_fmt', 'bgr24',
  
          '-s', "{}x{}".format(width, height),
  
          '-r', str(fps),
  
          '-i', '-',
  
          '-c:v', 'libx264',
  
          '-pix_fmt', 'yuv420p',
  
          '-preset', 'ultrafast',
  
          '-f', 'flv',
  
          rtmpUrl]

  I know that I can achieve this by :

  sudo raspivid -o - -t 0 -w 1280 -h 720 -fps 24 -b 1000000 | 
  
                  ffmpeg  -re -stream_loop -1 -i  "/home/pi/scrpt/Blive/StarBucks_BGN.mp3" \
  
          -f h264 -i - -vcodec copy -r 30 -acodec aac -b:a 100k -preset ultrafast \
  
          -tune zerolatency -f flv "rtmp://"

  So, I tried to add -re -stream_loop -1 -i  "/home/pi/scrpt/Blive/StarBucks_BGN.mp3" into the python pipe, but it crashed with :

  [libx264 @ 0x1952aa0] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x1952aa0] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x1952aa0] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  [flv @ 0x1951d00] FLV does not support sample rate 48000, choose from (44100, 22050, 11025)
  
  [flv @ 0x1951d00] Audio codec mp3 not compatible with flv
  
  Could not write header for output file #0 (incorrect codec parameters ?): Function not implementedStream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (mp3 (native) -> mp3 (libmp3lame))
  
      Last message repeated 1 times
  
  Traceback (most recent call last):
  
    File "With_BG.py", line 57, in <module>
  
      p.stdin.write(BG.tostring())
  
  BrokenPipeError: [Errno 32] Broken pipe
  
  </module>