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  • FFMpeg - Split Window RTMP - Delay on Second Stream

    22 février 2016, par Nick Smit

    I’m trying to combine two live RTMP sources into one split screen output with combined audio. The output is then sent on to a receiving RTMP server.

    Using the following command, which uses the same RTMP input for both feeds, I’ve managed to get the above working, however the input on the left is delayed by about 2 seconds from the one on the right.

    ffmpeg -re -i rtmp://myserver.tld/live/stream_key -re -i rtmp://myserver.tld/live/stream_key \
    
-filter_complex "\
    
nullsrc=size=1152x720 [base];\
    
[0:v] crop=576:720 [upperleft];\
    
[1:v] crop=576:720 [upperright];\
    
[base][upperleft] overlay=shortest=1 [tmp1];\
    
[tmp1][upperright] overlay=shortest=1:x=576;\
    
[0:a][1:a]amix \
    
" -c:a libfdk_aac -ar 44100 -threads 32 -c:v libx264 -g 50 -preset ultrafast -tune zerolatency -f flv rtmp://myserver.tld/live/new_stream_key

    Output :

    ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
    
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
    
configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    
libavutil      55.  4.100 / 55.  4.100
    
libavcodec     57.  7.100 / 57.  7.100
    
libavformat    57.  8.102 / 57.  8.102
    
libavdevice    57.  0.100 / 57.  0.100
    
libavfilter     6. 12.100 /  6. 12.100
    
libswscale      4.  0.100 /  4.  0.100
    
libswresample   2.  0.100 /  2.  0.100
    
libpostproc    54.  0.100 / 54.  0.100
    
[flv @ 0x3a0e940] video stream discovered after head already parsed
    
Input #0, flv, from 'rtmp://myserver.tld/live/stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
Duration: 00:00:00.00, start: 5.717000, bitrate: N/A
    
Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
    
Stream #0:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    
[flv @ 0x3a49e00] video stream discovered after head already parsed
    
Input #1, flv, from 'rtmp://myserver.tld/live/stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
Duration: 00:00:00.00, start: 9.685000, bitrate: N/A
    
Stream #1:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
    
Stream #1:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
    
[libx264 @ 0x3a9cd60] Application has requested 32 threads. Using a thread count greater than 16 is not recommended.
    
[libx264 @ 0x3a9cd60] using SAR=1/1
    
[libx264 @ 0x3a9cd60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
    
[libx264 @ 0x3a9cd60] profile Constrained Baseline, level 3.1
    
[libx264 @ 0x3a9cd60] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=11 lookahead_threads=11 sliced_threads=1 slices=11 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=50 keyint_min=5 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
    
Output #0, flv, to 'rtmp://myserver.tld/live/new_stream_key':
    
Metadata:
    
Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    
displayWidth    : 1152
    
displayHeight   : 720
    
fps             : 29
    
profile         :
    
level           :
    
encoder         : Lavf57.8.102
    
Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1152x720 [SAR 1:1 DAR 8:5], q=-1--1, 25 fps, 1k tbn, 25 tbc (default)
    
Metadata:
    
encoder         : Lavc57.7.100 libx264
    
Stream #0:1: Audio: aac (libfdk_aac) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, s16, 128 kb/s (default)
    
Metadata:
    
encoder         : Lavc57.7.100 libfdk_aac
    
Stream mapping:
    
Stream #0:0 (aac) -> amix:input0
    
Stream #0:1 (h264) -> crop
    
Stream #1:0 (aac) -> amix:input1
    
Stream #1:1 (h264) -> crop
    
overlay -> Stream #0:0 (libx264)
    
amix -> Stream #0:1 (libfdk_aac)
    
Press [q] to stop, [?] for help
    
[flv @ 0x3a0e940] Thread message queue blocking; consider raising the thread_queue_size option (current value: 512)
    
frame=   81 fps= 20 q=15.0 size=     674kB time=00:00:03.24 bitrate=1703.3kbits/frame=  102 fps= 22 q=22.0 size=     945kB time=00:00:04.08 bitrate=1896.4kbits/

    Is there any way to force FFMpeg to read both RTMP inputs at the same time ?

  • avcodec : Remove libaacplus

    24 janvier 2016, par Timothy Gu
    avcodec : Remove libaacplus

    TODO : bump minor
    

    It’s inferior in quality to fdk-aac and has an arguably more problematic
    
license.
    

    As early as 2012, a HydrogenAudio user reported :
    

    > It has however one huge advantage : much better quality at low bitrates than
    
> faac and libaacplus.
    

    (https://hydrogenaud.io/index.php?PHPSESSID=ckiq394pdglka0kj2fin6ij8t7&topic=95989.msg804633#msg804633)
    

    I myself have made a few spectrograms for a comparison of the two
    
encoders as well. The FDK output is consistently better than the
    
libaacplus one, in all bitrates I tested.
    

    libaacplus license is 3GPP + LGPLv2. 3GPP copyright notice is completely
    
proprietory, as follows :
    

    > No part may be reproduced except as authorized by written permission.
    
>
    
> The copyright and the foregoing restriction extend to reproduction in
    
> all media.
    
>
    
> © 2008, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC).
    
>
    
> All rights reserved.
    

    (The latest 26410-d00 zip from 3GPP has the same notice, but the copyright
    
year is changed to 2015)
    

    The copyright part of the FDK AAC license (section 2) is a copyleft
    
license that permits redistribution under certain conditions (and
    
therefore the LGPL + libfdk-aac combination is not prohibited by
    
configure) :
    

    > Redistribution and use in source and binary forms, with or without
    
> modification, are permitted without payment of copyright license fees
    
> provided that you satisfy the following conditions :
    
>
    
> You must retain the complete text of this software license in
    
> redistributions of the FDK AAC Codec or your modifications thereto in
    
> source code form.
    
>
    
> You must retain the complete text of this software license in the
    
> documentation and/or other materials provided with redistributions of
    
> the FDK AAC Codec or your modifications thereto in binary form.
    
>
    
> You must make available free of charge copies of the complete source
    
> code of the FDK AAC Codec and your modifications thereto to recipients
    
> of copies in binary form.
    
>
    
> The name of Fraunhofer may not be used to endorse or promote products
    
> derived from this library without prior written permission.
    
>
    
> You may not charge copyright license fees for anyone to use, copy or
    
> distribute the FDK AAC Codec software or your modifications thereto.
    
>
    
> Your modified versions of the FDK AAC Codec must carry prominent
    
> notices stating that you changed the software and the date of any
    
> change. For modified versions of the FDK AAC Codec, the term
    
> "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the
    
> term "Third-Party Modified Version of the Fraunhofer FDK AAC Codec
    
> Library for Android."
    • [DH] Changelog
    • [DH] LICENSE.md
    • [DH] configure
    • [DH] doc/general.texi
    • [DH] doc/platform.texi
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/allcodecs.c
    • [DH] libavcodec/libaacplus.c

  • Video rendering in OpenGL on Qt5

    28 janvier 2016, par Bobnono

    I’m trying to render my decoded frame from FFMPEG to an QOpenGLWindow.
    FFMPEG give me NV12 AVFrame or YUV420p or RGB.
    I choose the simplest RGB.

    I created an c_gl_video_yuv class inherit from QOpenGLWindow and QOpenGLFunctions_3_3.

    I want to use shader to draw my rectangle and texture it with the video frame. (for YUV I want the sader to convert it in RGB and apply texture)

    my c_gl_video_yuv class is define as below :

    class c_gl_video_yuv : public QOpenGLWindow,protected QOpenGLFunctions_3_3_Core
    
{
    
public:
    
   c_gl_video_yuv();
    
   ~c_gl_video_yuv();
    
---
    
   void update_texture(AVFrame *frame, int w, int h);
    

    
protected:
    
   void initializeGL();
    
   void paintGL();
    
   void resizeGL(int width, int height);
    

    
   void paintEvent(QPaintEvent *);
    

    
private:
    

    
   ---
    
   GLuint textures[2];
    
   --- 
    
   // Shader program
    
   QOpenGLShaderProgram *m_program;
    

    
   GLint locVertices;
    
   GLint locTexcoord;
    

    
};

    I initialise the OpenGL :

       void c_gl_video_yuv::initializeGL()
    
    {
    
      // Init shader program
    
        initializeOpenGLFunctions();
    
        glGenTextures(2, textures);
    
        /* Apply some filter on the texture */
    
        glBindTexture(GL_TEXTURE_2D, textures[0]);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    

    
        glBindTexture(GL_TEXTURE_2D, textures[1]);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    

    
        qDebug() << "c_gl_video_yuv::initializeGL() initialise shader"<< endl;
    
        m_program = new QOpenGLShaderProgram(this);
    
        m_program->addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shader/Ressources/vertex_yuv.glsl");
    
        m_program->addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shader/Ressources/rgb_to_rgb_shader .glsl");
    
        m_program->link();
    

    
    //    /* Grab location of shader attributes. */
    
        locVertices = m_program->attributeLocation("position");
    
        locTexcoord = m_program->attributeLocation("texpos");
    

    
        /* Enable vertex arrays to push the data. */
    
        glEnableVertexAttribArray(locVertices);
    
        glEnableVertexAttribArray(locTexcoord);
    

    
        /* set data in the arrays. */
    
            glVertexAttribPointer(locVertices, 2, GL_FLOAT, GL_FALSE, 0,
    
                          &vertices[0][0]);
    
            glVertexAttribPointer(locTexcoord, 2, GL_FLOAT, GL_FALSE, 0,
    
                          &texcoords[0][0]);
    

    
        // GL options
    
        glEnable(GL_DEPTH_TEST);    
    
    }

    And I render

    void c_gl_video_yuv::paintGL()
    
    {
    

    
        qDebug() <<  "paintGL()   set viewport "<* Clear background. */
    
        glClearColor(0.5f,0.5f,0.5f,1.0f);
    
        glClear(GL_COLOR_BUFFER_BIT);
    

    
        if(first_frame)
    
        {
    
            qDebug() <<  "paintGL() Bind shader" <<  endl;
    
            m_program->bind();
    

    
            /* Get Ytex attribute to associate to TEXTURE0 */
    
                m_program->bindAttributeLocation("Ytex",0);
    
                m_program->bindAttributeLocation("UVtex",1);
    

    
                qDebug() <<  "paintGL() Bind texture" <<  endl;
    
            if(!is_init)
    
            {
    
                glActiveTexture(GL_TEXTURE0);
    
                glBindTexture(GL_TEXTURE_2D, textures[0]);
    
                glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, frame_width, frame_height, 0, GL_RGB, GL_UNSIGNED_BYTE, frame_yuv->data[0] );
    

    
                glActiveTexture(GL_TEXTURE1);
    
                glBindTexture(GL_TEXTURE_2D, textures[1]);
    
                glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, frame_width, frame_height, 0, GL_RGB, GL_UNSIGNED_BYTE, frame_yuv->data[0] );
    
                is_init = true;
    
            }
    
            else
    
            {
    
                glActiveTexture(GL_TEXTURE0);
    
                glBindTexture(GL_TEXTURE_2D, textures[0]);
    
               glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, frame_width, frame_height, GL_RGB, GL_UNSIGNED_BYTE, frame_yuv->data[0]);
    

    
               glActiveTexture(GL_TEXTURE1);
    
               glBindTexture(GL_TEXTURE_2D, textures[1]);
    
               glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, frame_width, frame_height, GL_RGB, GL_UNSIGNED_BYTE, frame_yuv->data[0]);
    
            }
    

    

    

    
            glVertexAttribPointer(locVertices, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    
            glVertexAttribPointer(locTexcoord, 2, GL_FLOAT, GL_FALSE, 0, texcoords);
    

    
            glEnableVertexAttribArray(0);
    
            glEnableVertexAttribArray(1);
    

    
            glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    

    
            glDisableVertexAttribArray(1);
    
            glDisableVertexAttribArray(0);
    
            m_program->release();
    
        }
    
    }

    the vertex shader is :

     #version 330 core
    
    attribute vec3 position;
    
    attribute vec2 texpos;
    
    varying vec2 opos;
    
    void main(void)
    
    {
    
        opos = texpos;
    
        gl_Position = vec4(position, 1.0);
    
    }

    and the Fragment shader is :

    version 330 core
    
in vec2 TexCoords;
    
out vec4 color;
    
uniform sampler2D YImage;
    
uniform sampler2D UVImage;
    
const vec3 r_c = vec3(1.164383,  0.000000,  1.596027);
    
const vec3 g_c = vec3(1.164383, -0.391762, -0.812968);
    
const vec3 b_c = vec3(1.164383,  2.017232,  0.000000);
    
const vec3 offset = vec3(-0.0625, -0.5, -0.5);
    
void main()
    
{
    
   float y_val = texture(YImage, TexCoords).r;
    
   float u_val = texture(UVImage, TexCoords).r;
    
   float v_val = texture(UVImage, TexCoords).g;
    
   vec3 yuv = vec3(y_val, u_val, v_val);
    
   yuv += offset;
    
   color.r = dot(yuv, r_c);
    
   color.g = dot(yuv, g_c);
    
   color.b = dot(yuv, b_c);
    
   color.a = 1.0;
    
};

    (for RGB frame a replace thevec3(1.164383, 0.000000, 1.596027) ; by vec3(1.0, 1.000000, 1.0) ;

    So before i receive a frame it render nothing, just a grey window - noarmal
    After I receive a frame, the textures are uploaded and the shaders normaly create the player. But nothing appear not even a black rectangle nothing, just plain grey.

    What is wrong ?
    It is not the right way to upload texture, or my vertex are not created ?
    of course i declarde my vetrtices eand texture coordonate

    const GLfloat vertices[][2] = {
    
    {-1.f, -1.f},
    
    {1.f, -1.f},
    
    {-1.f, 1.f},
    
    {1.f, 1.f}
    
};
    
const GLfloat texcoords[][2] = {
    
    {0.0f, 1.0f},
    
    {1.0f, 1.0f},
    
    {0.0f, 0.0f},
    
    {1.0f, 0.0f}
    
};

    I am very new to OpenGL so it is quite fuzzy in my head, but I thought it is not really hard to draw a rectangle with a streaming texture.
    Maybe i should use vbo or fbo but I still don’t really understand this.

    If someone can help me, I will appreciate !
    Thanks

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