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• Pygame : Frame ghosting ?

  5 octobre 2022, par Sam Tubb

  I am working on a animation environment in python using pygame. The user draw's each frame, and then using ffmpeg the animation is saved as an .avi movie. I would like to implement a feature, but am not sure how.. frame ghosting. Like display the previous frame while you draw the current.

  



  I tried creating a surface called ghost that copies the current frame when the next-frame key is pressed. Then draws it with an alpha level of 10, but this didn't work out correctly.

  



  I am not sure what to do, here is the source code for anyone that thinks they have an idea :

  



  #Anim8

import pygame,subprocess,shutil
from os import makedirs
from pygame.locals import *
from random import randrange
pygame.init()
screen=pygame.display.set_mode((740,580))
draw=pygame.Surface((740,540))
draw.fill((200,200,200))
bcol=(200,200,200)
gui=pygame.Surface((740,40))
gui.fill((50,50,50))
size=2
color=(0,0,0)
screen.fill((200,200,200))
prevcol=0
newcol=0
f=0
msg=''
framerate=60
try:
    makedirs('anim')
except:
    pass
def DrawColors(x,y):
    pygame.draw.rect(gui, (255,0,0), (x+3,y+3,15,15),0)
    pygame.draw.rect(gui, (0,0,0), (x+3,y+21,15,15),0)
    pygame.draw.rect(gui, (0,255,0), (x+21,y+3,15,15),0)
    pygame.draw.rect(gui, (200,200,200), (x+21,y+21,15,15),0)
    pygame.draw.rect(gui, (0,0,255), (x+39,y+3,15,15),0)
while True:
    pygame.display.set_caption('Anim8 - Sam Tubb - '+'Frame: '+str(f)+' '+str(msg))
    mse=pygame.mouse.get_pos()
    screen.blit(gui, (0,0))
    DrawColors(0,0)
    screen.blit(draw,(0,40))
    key=pygame.key.get_pressed()
    if key[K_1]:
        framerate=10
        msg='Frame Rate set to 10'
    if key[K_2]:
        framerate=20
        msg='Frame Rate set to 20'
    if key[K_3]:
        framerate=30
        msg='Frame Rate set to 30'
    if key[K_4]:
        framerate=40
        msg='Frame Rate set to 40'
    if key[K_5]:
        framerate=50
        msg='Frame Rate set to 50'
    if key[K_6]:
        framerate=60
        msg='Frame Rate set to 60'
    if key[K_7]:
        framerate=70
        msg='Frame Rate set to 70'
    if key[K_8]:
        framerate=80
        msg='Frame Rate set to 80'
    if key[K_9]:
        framerate=90
        msg='Frame Rate set to 90'
    if key[K_0]:
        framerate=100
        msg='Frame Rate set to 100'

    if key[K_a]:
        pygame.image.save(draw, 'anim/frame'+str(f)+'.png')
        f+=1
    for e in pygame.event.get():
        if e.type==QUIT:
            shutil.rmtree('anim')
            exit()
        if e.type==KEYDOWN:
            if e.key==K_s:
                msg='Added Frame!'
                pygame.image.save(draw, 'anim/frame'+str(f)+'.png')
                f+=1
            if e.key==K_c:
                draw.fill(bcol)
            if e.key==K_r:
                name='anim'+str(randrange(0,999))+str(randrange(0,999))+'.avi'
                msg='Rendering: '+name
                pygame.display.set_caption('Anim8 - Sam Tubb - '+'Frame: '+str(f)+' '+str(msg))
                subprocess.call('ffmpeg -f image2 -s 640x480 -i anim/frame%01d.png -r '+str(framerate)+' '+name,shell=True)
                msg='Done!'
            if e.key==K_p:
                subprocess.call('ffplay '+name,shell=True)
        if e.type==MOUSEBUTTONDOWN:
            if e.button==1:
                try:
                    prevcol=color
                    newcol=gui.get_at(mse)
                    if newcol==(50,50,50):
                        newcol=prevcol
                    color=newcol
                except:
                    pass
            if e.button==3:
                try:
                    prevcol=bcol
                    newcol=gui.get_at(mse)
                    if newcol==(50,50,50):
                        newcol=prevcol
                    draw.fill(newcol)
                    bcol=newcol
                except:
                    pass
            if e.button==4:
                size+=1
                if size>7:
                    size=7
            if e.button==5:
                size-=1
                if size==0:
                    size=1 
        if e.type == pygame.MOUSEMOTION:
            lineEnd = pygame.mouse.get_pos()
            lineEnd = (lineEnd[0],lineEnd[1]-40)
            if pygame.mouse.get_pressed() == (1, 0, 0):
                    pygame.draw.line(draw, color, lineStart, lineEnd, size)
            lineStart = lineEnd

    pygame.display.flip()


  



  Oh, and on another note, just if anyone was curious, here is what the output looks like.. I made a little new year's animation :

  



  

  


• Issues with using FFmpeg to generate MPEG-DASH files

  26 septembre 2022, par Tina J

  I am using the following ffmpeg command to generate MPEG DASH files and manifest. I use single_file 1 to have a single file for each representation ; so no chunking. But IDK why when I want to play the manifest using ExoPlayer, the video doesn't play from the beginning (rather it starts from around 50s).

  


  ffmpeg -re -i .\video-h264.mkv -map 0 -map 0 -c:a aac -c:v libx264 -b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline -profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -single_file 1 -use_template 1 -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" -f dash out.mpd


  


  What is wrong with this ? Is the manifest correct ? Here is the generated mpd :

  


  &lt;?xml version="1.0" encoding="utf-8"?>&#xA;<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" mediapresentationduration="PT1M20.1S" maxsegmentduration="PT5.0S" minbuffertime="PT16.0S">&#xA;    <programinformation>&#xA;    </programinformation>&#xA;    <servicedescription>&#xA;    </servicedescription>&#xA;    <period start="PT48.0S">&#xA;        <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30/1" maxwidth="960" maxheight="540" par="517072:290799" lang="eng">&#xA;            <representation mimetype="video/mp4" codecs="avc1.4d401f" bandwidth="800000" width="960" height="540" sar="32317:32311">&#xA;                <baseurl>out-stream0.mp4</baseurl>&#xA;                <segmentlist timescale="1000000" duration="5000000" startnumber="7">&#xA;                    <initialization range="0-832"></initialization>&#xA;                    <segmenturl mediarange="4800141-5599188" indexrange="4800141-4800192"></segmenturl>&#xA;                    <segmenturl mediarange="5599189-6243069" indexrange="5599189-5599240"></segmenturl>&#xA;                    <segmenturl mediarange="6243070-7224302" indexrange="6243070-6243121"></segmenturl>&#xA;                    <segmenturl mediarange="7224303-8138118" indexrange="7224303-7224354"></segmenturl>&#xA;                    <segmenturl mediarange="8138119-8232111" indexrange="8138119-8138170"></segmenturl>&#xA;                </segmentlist>&#xA;            </representation>&#xA;            <representation mimetype="video/mp4" codecs="avc1.42c00d" bandwidth="300000" width="320" height="170" sar="549389:581598">&#xA;                <baseurl>out-stream2.mp4</baseurl>&#xA;                <segmentlist timescale="1000000" duration="5000000" startnumber="7">&#xA;                    <initialization range="0-832"></initialization>&#xA;                    <segmenturl mediarange="1782920-2005667" indexrange="1782920-1782971"></segmenturl>&#xA;                    <segmenturl mediarange="2005668-2229412" indexrange="2005668-2005719"></segmenturl>&#xA;                    <segmenturl mediarange="2229413-2615209" indexrange="2229413-2229464"></segmenturl>&#xA;                    <segmenturl mediarange="2615210-2975346" indexrange="2615210-2615261"></segmenturl>&#xA;                    <segmenturl mediarange="2975347-2999288" indexrange="2975347-2975398"></segmenturl>&#xA;                </segmentlist>&#xA;            </representation>&#xA;        </adaptationset>&#xA;        <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">&#xA;            <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="69000" audiosamplingrate="44100">&#xA;                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>&#xA;                <baseurl>out-stream1.mp4</baseurl>&#xA;                <segmentlist timescale="1000000" duration="5000000" startnumber="12">&#xA;                    <initialization range="0-764"></initialization>&#xA;                    <segmenturl mediarange="491493-536039" indexrange="491493-491544"></segmenturl>&#xA;                    <segmenturl mediarange="536040-580657" indexrange="536040-536091"></segmenturl>&#xA;                    <segmenturl mediarange="580658-625158" indexrange="580658-580709"></segmenturl>&#xA;                    <segmenturl mediarange="625159-669825" indexrange="625159-625210"></segmenturl>&#xA;                    <segmenturl mediarange="669826-713289" indexrange="669826-669877"></segmenturl>&#xA;                </segmentlist>&#xA;            </representation>&#xA;            <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="69000" audiosamplingrate="22050">&#xA;                <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>&#xA;                <baseurl>out-stream3.mp4</baseurl>&#xA;                <segmentlist timescale="1000000" duration="5000000" startnumber="12">&#xA;                    <initialization range="0-764"></initialization>&#xA;                    <segmenturl mediarange="486188-530059" indexrange="486188-486239"></segmenturl>&#xA;                    <segmenturl mediarange="530060-574175" indexrange="530060-530111"></segmenturl>&#xA;                    <segmenturl mediarange="574176-618922" indexrange="574176-574227"></segmenturl>&#xA;                    <segmenturl mediarange="618923-663118" indexrange="618923-618974"></segmenturl>&#xA;                    <segmenturl mediarange="663119-706121" indexrange="663119-663170"></segmenturl>&#xA;                </segmentlist>&#xA;            </representation>&#xA;        </adaptationset>&#xA;    </period>&#xA;</mpd>&#xA;

  


• Metadata is not showing ffmpeg C++

  22 novembre 2022, par Kaidul

  I am muxing h264 encoded video data and PCM g711 encoded audio data into a .mov media container. I am trying to write metadata on header but the metadata is not showing when I go to file->right click->properties->details on windows and likewise in Ubuntu. This is my code -

  



  // Instead of creating new AVDictionary object, I also tried following way
// stated here: http://stackoverflow.com/questions/17024192/how-to-set-header-metadata-to-encoded-video 
// but no luck
AVDictionary* pMetaData = m_pFormatCtx->metadata;
av_dict_set(&pMetaData, "title", "Cloud Recording", 0);
av_dict_set(&pMetaData, "artist", "Foobar", 0);
av_dict_set(&pMetaData, "copyright", "Foobar", 0);
av_dict_set(&pMetaData, "filename", m_sFilename.c_str(), 0);
time_t now = time(0);
struct tm tStruct = *localtime(&now);
char date[100];
strftime(date, sizeof(date), "%c", &tStruct); // i.e. Thu Aug 23 14:55:02 2001
av_dict_set(&pMetaData, "date", date, 0);
av_dict_set(&pMetaData, "creation_time", date, 0);
av_dict_set(&pMetaData, "comment", "This video has been created using Eyeball MSDK", 0);

// ....................
// .................

/* write the stream header, if any */
int ret = avformat_write_header(m_pFormatCtx, &pMetaData);


  



  I also tried to see if the file contains any metadata using mediainfo and exiftools in linux. Also I tried ffmpeg -i output.mov but no metadata is shown.

  



  Whats the problem ? Is the flags value 0 in av_dict_set okay ? DO I need to set different flags for different platform (windows/linux) ?

  



  I saw this link and it stated that for windows, I have to use id3v2_version 3 and -write_id3v1 1 to make metadata working. If so, how can I do this in C++ ?