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• ffmpeg Non monotonous DTS, Previous DTS is always the same, audio microphone streaming [closed]

  5 février, par adrien gonzalez

  I'm using ffmpeg to stream audio from a microphone using rtp. I'm on Raspberry and use an external sound card (HifiBerry DAC + ADC Pro).
My goal is to stream audio with the lowest latency possible to others Raspberry reading this audio with ffplay. I try not to compress the audio flux and leave it untouched as wav 48000 Hz.
I encounter often some Non Monotonous DTS errors. When this happens I have a latency of hundred of milliseconds adding itself.
I tried to add the +igndts flag but it is not changing anything. Also tried +genpts flag.

  


  What is weird is that the previous DTS is always the same (201165 is the example below) and does not seems to change.
I looked on forums for answers but I'm unable to find one.

  


  Here is my bash command :

  


  ffmpeg -guess_layout_max 0 -re -f alsa -i hw -acodec pcm_s16le -ac 1 -payload_type 10 -f rtp rtp://192.168.1.152:5003

  


  And the result from the terminal :

  


  ffmpeg version 5.1.6-0+deb12u1+rpt1 Copyright (c) 2000-2024 the FFmpeg developers


built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=0+deb12u1+rpt1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, alsa, from 'hw':
  Duration: N/A, start: 1738663653.066577, bitrate: 1536 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, rtp, to 'rtp://192.168.1.152:5003':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
    Metadata:
      encoder         : Lavc59.37.100 pcm_s16le
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 192.168.1.152
t=0 0
a=tool:libavformat LIBAVFORMAT_VERSION
m=audio 5003 RTP/AVP 10
b=AS:768

[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201160; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201155; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201149; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201142; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201134; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201124; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201114; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201102; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201089; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201075; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201060; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201044; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201027; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 201009; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 200990; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 200970; changing to 201165. This may result in incorrect timestamps in the output file.
[rtp @ 0x558b48ea90] Non-monotonous DTS in output stream 0:0; previous: 201165, current: 200949; changing to 201165. This may result in incorrect timestamps in the output file.


  


  I tried to add the +igndts flag but it is not changing anything. Also tried +genpts flag. I expected the DTS to restore itself but I still have the same issue

  


• FFmpeg matlab error : At least one output file must be specified ? [closed]

  3 mars, par as moh

  I'm trying to get I frames from a video using Matlab using this command system(sprintf('ffmpeg -i testVid.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr output_%03d.png')); ,but i get this message

  


   ffmpeg version 7.1-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers 
  built with gcc 14.2.0 (Rev1, Built by MSYS2 project) 
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libvvenc --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint 
  libavutil      59. 39.100 / 59. 39.100 
  libavcodec     61. 19.100 / 61. 19.100 
  libavformat    61.  7.100 / 61.  7.100 
  libavdevice    61.  3.100 / 61.  3.100 
  libavfilter    10.  4.100 / 10.  4.100 
  libswscale      8.  3.100 /  8.  3.100 
  libswresample   5.  3.100 /  5.  3.100 
  libpostproc    58.  3.100 / 58.  3.100 
Trailing option(s) found in the command: may be ignored. 
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testVid.mp4': 
  Metadata: 
    major_brand     : isom 
    minor_version   : 512 
    compatible_brands: isomiso2avc1mp41 
    encoder         : Lavf57.83.100 
  Duration: 00:00:02.02, start: 0.000000, bitrate: 12798 kb/s 
  Stream #0:0[0x1](eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x720 [SAR 1:1 DAR 16:9], 12662 kb/s, 29.74 fps, 30 tbr, 90k tbn (default) 
      Metadata: 
        handler_name    : VideoHandler 
        vendor_id       : [0][0][0][0] 
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 121 kb/s (default) 
      Metadata: 
        handler_name    : SoundHandler 
        vendor_id       : [0][0][0][0] 
At least one output file must be specified 


  


  i searched and tried many cases but i don't know where is the problem, any help please ?

  


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       this.isValid = false;<br />
     }<br />
   },<br />
<br />
   htmlEmbedDropdownValidation: function(field) {<br />
     var dropdowns = field.querySelectorAll('.mimi_html_dropdown');<br />
     var _this = this;<br />
<br />
     for (var i = 0; i &lt; dropdowns.length; ++i) {<br />
       var dropdown = dropdowns[i];<br />
<br />
       if (dropdown.value) {<br />
         field.className = field.className.replace(/ invalid/g, '');<br />
       } else {<br />
         if (field.className.indexOf('invalid') === -1) field.className += ' invalid';<br />
         this.isValid = false;<br />
         dropdown.onchange = (function(){ _this.validate(); });<br />
       }<br />
     }<br />
   },<br />
<br />
   textFieldError: function(input) {<br />
     input.className   = 'required invalid';<br />
     input.placeholder = input.getAttribute('data-required-field');<br />
   },<br />
<br />
   removeTextFieldError: function(input) {<br />
     input.className   = 'required';<br />
     input.placeholder = '';<br />
   },<br />
<br />
   onSelectCallback: function(input) {<br />
     if (typeof Widget === 'undefined' || !Widget.BasicDropdown) return;<br />
<br />
     var dropdownEl = input.parentNode,<br />
         instances  = Widget.BasicDropdown.instances,<br />
         _this = this;<br />
<br />
     for (var i = 0; i &lt; instances.length; ++i) {<br />
       var instance = instances[i];<br />
       if (instance.wrapperEl === dropdownEl) {<br />
         instance.onSelect = function(){ _this.validate() };<br />
       }<br />
     }<br />
   },<br />
<br />
   updateFormAfterValidation: function() {<br />
     this.form.className   = this.setFormClassName();<br />
     this.submit.value     = this.submitButtonText();<br />
     this.submit.disabled  = !this.isValid;<br />
     this.submit.className = this.isValid ? 'submit' : 'disabled';<br />
   },<br />
<br />
   setFormClassName: function() {<br />
     var name = this.form.className;<br />
<br />
     if (this.isValid) {<br />
       return name.replace(/\s?mimi_invalid/, '');<br />
     } else {<br />
       if (name.indexOf('mimi_invalid') === -1) {<br />
         return name += ' mimi_invalid';<br />
       } else {<br />
         return name;<br />
       }<br />
     }<br />
   },<br />
<br />
   submitButtonText: function() {<br />
     var invalidFields = document.querySelectorAll('.invalid'),<br />
         text;<br />
<br />
     if (this.isValid || !invalidFields) {<br />
       text = this.submit.getAttribute('data-default-text');<br />
     } else {<br />
       if (invalidFields.length || invalidFields[0].className.indexOf('checkgroup') === -1) {<br />
         text = this.submit.getAttribute('data-invalid-text');<br />
       } else {<br />
         text = this.submit.getAttribute('data-choose-list');<br />
       }<br />
     }<br />
     return text;<br />
   },<br />
<br />
   submitForm: function() {<br />
     this.formSubmitting();<br />
<br />
     var _this = this;<br />
     window[this.callbackName] = function(response) {<br />
       delete window[this.callbackName];<br />
       document.body.removeChild(script);<br />
       _this.onSubmitCallback(response);<br />
     };<br />
<br />
     var script = document.createElement('script');<br />
     script.src = this.formUrl('json');<br />
     document.body.appendChild(script);<br />
   },<br />
<br />
   formUrl: function(format) {<br />
     var action  = this.form.action;<br />
     if (format === 'json') action += '.json';<br />
     return action + '?callback=' + this.callbackName + '&amp;' + serialize(this.form);<br />
   },<br />
<br />
   formSubmitting: function() {<br />
     this.form.className  += ' mimi_submitting';<br />
     this.submit.value     = this.submit.getAttribute('data-submitting-text');<br />
     this.submit.disabled  = true;<br />
     this.submit.className = 'disabled';<br />
   },<br />
<br />
   onSubmitCallback: function(response) {<br />
     if (response.success) {<br />
       this.onSubmitSuccess(response.result);<br />
     } else {<br />
       top.location.href = this.formUrl('html');<br />
     }<br />
   },<br />
<br />
   onSubmitSuccess: function(result) {<br />
     if (result.has_redirect) {<br />
       top.location.href = result.redirect;<br />
     } else if(result.single_opt_in || !result.confirmation_html) {<br />
       this.disableForm();<br />
       this.updateSubmitButtonText(this.submit.getAttribute('data-thanks'));<br />
     } else {<br />
       this.showConfirmationText(result.confirmation_html);<br />
     }<br />
   },<br />
<br />
   showConfirmationText: function(html) {<br />
     var fields = this.form.querySelectorAll('.mimi_field');<br />
<br />
     for (var i = 0; i &lt; fields.length; ++i) {<br />
       fields[i].style['display'] = 'none';<br />
     }<br />
<br />
     (this.form.querySelectorAll('fieldset')[0] || this.form).innerHTML = html;<br />
   },<br />
<br />
   disableForm: function() {<br />
     var elements = this.form.elements;<br />
     for (var i = 0; i &lt; elements.length; ++i) {<br />
       elements[i].disabled = true;<br />
     }<br />
   },<br />
<br />
   updateSubmitButtonText: function(text) {<br />
     this.submit.value = text;<br />
   },<br />
<br />
   revalidateOnChange: function() {<br />
     var fields = this.form.querySelectorAll(&quot;.mimi_field.required&quot;),<br />
         _this = this;<br />
<br />
     var onTextFieldChange = function() {<br />
       if (this.getAttribute('name') === 'signup[email]') {<br />
         if (_this.validEmail.test(this.value)) _this.validate();<br />
       } else {<br />
         if (this.value.length === 1) _this.validate();<br />
       }<br />
     }<br />
<br />
     for (var i = 0; i &lt; fields.length; ++i) {<br />
       var inputs = fields[i].getElementsByTagName('input');<br />
       for (var j = 0; j &lt; inputs.length; ++j) {<br />
         if (this.fieldType(fields[i]) === 'text_field') {<br />
           inputs[j].onkeyup = onTextFieldChange;<br />
           inputs[j].onchange = onTextFieldChange; <br />
         } else {<br />
           inputs[j].onchange = function(){ _this.validate() };<br />
         }<br />
       }<br />
     }<br />
   }<br />
 });<br />
<br />
 if (document.addEventListener) {<br />
   document.addEventListener(&quot;DOMContentLoaded&quot;, function() {<br />
     new Mimi.Signups.EmbedValidation();<br />
   });<br />
 }<br />
 else {<br />
   window.attachEvent('onload', function() {<br />
     new Mimi.Signups.EmbedValidation();<br />
   });<br />
 }<br />
})(this);<br />
&lt;/script&gt;

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