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• How can one pipe the audio waveform image out of ffmpeg into an image display command/application ? [closed]

  15 mai 2022, par esp

  These two commands, when used in succession, produce a .png file of the inputted audio waveform.

  


  ffmpeg -i audioFile.mp3 -filter_complex "showwavespic=s=640x120" -frames:v 1 imageFile.png
qlmanage -p imageFile.png


  


  But I have not succeeded in piping the image from the first to the second. Simply using "|" between them did not work.

  


  ffmpeg -i audioFile.mp3 -filter_complex "showwavespic=s=640x120" -frames:v 1 |
qlmanage -p


  


  Error :

  


  Filter showwavespic has an unconnected output


  


  Sounds pretty fundamental !

  


  Please, how can what I am trying to do be achieved ?

  


• Pipe and OpenCV to FFmpeg with audio streaming RTMP in Python

  11 mai 2022, par KevinTran

  I'm trying to stream FFmpeg with audio.

  
I will show my code below :

  

  


  Import module

  


  import subprocess as sp


  


  ---

  


  Create variables

  


  rtmpUrl = "rtmp://a.rtmp.youtube.com/live2/key"
camera_path = "BigBuckBunny.mp4"
cap = cv.VideoCapture(camera_path)

# Get video information
fps = int(cap.get(cv.CAP_PROP_FPS))
width = int(cap.get(cv.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv.CAP_PROP_FRAME_HEIGHT))


  


  ---

  


  Command param

  


  # ffmpeg command
command = ['ffmpeg',
        '-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]


  


  ---

  


  Create subprocess to ffmpeg command

  


  # Pipeline configuration
p = sp.Popen(command, stdin=sp.PIPE)


  


  ---

  


  Send frame to RTMP server

  


  # read webcamera
while(cap.isOpened()):
    ret, frame = cap.read()
    if not ret:
        print("Opening camera is failed")
        break

    # write to pipe
    p.stdin.write(frame.tobytes())


  


  I hope you can help me to be able to live stream via FFmpeg over RTMP with audio. Thanks !

  


• FFmpeg pipe input, error while transcoding from WebM to MP4

  7 mai 2022, par saurav

  I am trying to record a video from pipe input using FFMPEG. The pipe input is in WebM format i.e. the video codec is VP8 and the audio codec is OPUS. I am able to save the output video in the WebM format using FFMPEG without any issue. But when I am trying to save it in MP4 format, I am not getting the desired output. Though there are no errors while saving, the output file shows an error with description " This file contains no playable streams !."

  


  These are the options for successfully recording in the WebM format.

  


      '-loglevel', 'debug', '-protocol_whitelist', 'pipe,udp,rtp', 
'-fflags', '+genpts', '-i', 'pipe:0', '-map', '0:v:0', '-c:v', 
'copy', '-map', '0:a:0', '-strict', '-2', '-c:a', 'copy', '-flags',
 '+global_header', '-f', 'webm', 'output.webm'


  


  Here are my ffmpeg options for recording in the MP4 format.

  


      '-thread_queue_size', '4096', '-r', '25', '-i', 'pipe:0', 
    '-c:v', 'libx264', '-preset', 'veryFast', '-pix_fmt', 'yuvj420p', 
    '-acodec', 'aac', "output.mp4"


  


  Console output after executing this command as a subprocess

  


  > ffmpeg::process::data [data:'  libavutil      56. 31.100 / 56. 
31.100\n' + '  libavcodec     58. 54.100 / 58. 54.100\n' + '  
libavformat    58. 29.100 / 58. 29.100\n' + '  libavdevice    58. 
 8.100 / 58.  8.100\n' + '  libavfilter     7. 57.100 /  7. 57.100\n'
 + '  libavresample   4.  0.  0 /  4.  0.  0\n' + '  libswscale 
     5.  5.100 /  5.  5.100\n' + '  libswresample   3.  5.100 /  3.
  5.100\n' + '  libpostproc    55.  5.100 / 55.  5.100\n'] +1ms
> 
> ffmpeg ffmpeg::process::data [data:"Input #0, matroska,webm, from
> 'pipe:0':\n" + '  Metadata:\n' + '    encoder         : Chrome\n' + ' 
> Duration: N/A, start: 0.000000, bitrate: N/A\n' + '    Stream
> #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)\n' + ' 
   Stream #0:1(eng): Video: vp8, yuv420p(progressive), 1920x950, SAR 1:1
> DAR 192:95, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)\n' + '   
> Metadata:\n' + '      alpha_mode      : 1\n'] +1s
> 
> 
>  ffmpeg::process::data [data:'Stream mapping:\n' + '  Stream #0:1 ->
> #0:0 (vp8 (native) -> h264 (libx264))\n' + '  Stream #0:0 -> #0:1 
(opus (native) -> aac (native))\n'] +1ms
> 
>    ffmpeg::process::data [data:'[swscaler @ 0x55a63050ddc0] deprecated
> pixel format used, make sure you did set range correctly\n'] +23ms
> 
>   ffmpeg::process::data [data:'[libx264 @ 0x55a630489980] using
> SAR=1/1\n'] +10ms
> 
>   ffmpeg::process::data [data:'[libx264 @ 0x55a630489980] using cpu
> capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2\n'] +0ms
> 
>   ffmpeg::process::data [data:'[libx264 @ 0x55a630489980] profile
> High, level 4.0\n'] +8ms
> 
>   ffmpeg::process::data [data:'[libx264 @ 0x55a630489980] 264 - core
> 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 -
> http://www.videolan.org/x264.html - options: cabac=1 ref=1
> deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00
> mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0
> deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=18
> lookahead_threads=6 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=1 keyint=250
> keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf
> mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
> aq=1:1.00\n'] +1ms
> 
>   ffmpeg::process::data [data:"Output #0, mp4, to 'output.mp4':\n" + '
> Metadata:\n' + '    encoder         : Lavf58.29.100\n' + '    Stream
> #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), 
yuvj420p(pc), 1920x950 [SAR 1:1 DAR 192:95], q=-1--1, 25 fps, 12800 tbn, 25 tbc
> (default)\n' + '    Metadata:\n' + '      alpha_mode      : 1\n' + '  
> encoder         : Lavc58.54.100 libx264\n' + '    Side data:\n' + '   
> cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1\n' + '   
> Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
> stereo, fltp, 128 kb/s (default)\n' + '    Metadata:\n' + '     
> encoder         : Lavc58.54.100 aac\n'] +0ms
> 
> ffmpeg::process::data [data:'frame=   45 fps=0.0 q=28.0 size=      
> 0kB time=00:00:01.87 bitrate=   0.2kbits/s speed=3.48x    \r'] +505ms
> 
> ffmpeg::process::data [data:'frame=   61 fps= 56 q=28.0 size=      
> 0kB time=00:00:02.41 bitrate=   0.2kbits/s speed=2.22x    \r'] +564ms
> 
> ffmpeg::process::data [data:'frame=   76 fps= 48 q=28.0 size=      
> 0kB time=00:00:02.88 bitrate=   0.1kbits/s speed=1.81x    \r'] +492ms


  


  I have a doubt on this output as it may have been causing the issue.

  


  ffmpeg::process::data [data:'[swscaler @ 0x55a63050ddc0] deprecated
 pixel format used, make sure you did set range correctly\n'] +23ms


  


  I hope I have provided enough information about the issue I am facing. Please ask for any other information needed to understand the issue correctly.

  


  I am sure that I am missing some ffmpeg options which is causing this issue. But I am not able to identify them ! Any help in correcting this issue would be greatly appreciated.

  


  Thank you.