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• 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++ ?

  


• How to create a video from images with timestamps, sizes and positions with ffmpeg

  23 octobre 2022, par Maxou

  I want to convert a subtitle file (.sup) to a video file with transparency. To do that I convert my .sup file into a multitude of png files listed in a xml file.

  


  XML File

  


  &lt;?xml version="1.0" encoding="UTF-8"?>&#xA;<bdn version="0.93">&#xA;  <description>&#xA;    <format videoformat="1080p" framerate="25" dropframe="False"></format>&#xA;    <events type="Graphic" firsteventintc="00:00:00:01" lasteventouttc="00:23:59:05" numberofevents="708"></events>&#xA;  </description>&#xA;  <events>&#xA;    <event intc="00:00:00:01" outtc="00:00:03:09" forced="False">&#xA;      <graphic width="1146" height="65" x="387" y="985">seq_0001.png</graphic>&#xA;    </event>&#xA;    <event intc="00:00:04:19" outtc="00:00:07:14" forced="False">&#xA;      <graphic width="1112" height="65" x="404" y="985">seq_0002.png</graphic>&#xA;    </event>&#xA;    <event intc="00:00:08:06" outtc="00:00:10:23" forced="False">&#xA;      <graphic width="681" height="65" x="619" y="985">seq_0003.png</graphic>&#xA;    </event>&#xA;  </events>&#xA;</bdn>&#xA;

  


  I tried to generate a video using this command

  


  ffmpeg -t 20 -s 1920x1080 \
-f rawvideo -pix_fmt yuva420p -i /dev/zero \
-i seq-1.png \
-filter_complex "[0:v][1:v] overlay=25:25:enable='between(t,0,20)'" \
empty.webm


  


  It works but it takes a long time and I only manage to do it with one image.

  


  It is possible to generate a video with all the images (with size, position and timestamp) include in the xml file ?

  


• Start ffmpeg sound recording at system start doesn't work

  3 octobre 2022, par CheatingBoy

  I made a python script to record sound at System boot, but it doesn't work. I've tried using crontab and systemd but it doesn't work. If I start the program manually it works out fine.

  


  #!/bin/python3
import RPi.GPIO as GPIO
import time
import datetime
import subprocess
import os
import signal
GPIO.setmode(GPIO.BCM)
GPIO.setup(24, GPIO.IN)
GPIO.setup(23, GPIO.OUT)
print("Started Sound_Recorder_ULtimate_Control")
p = None
while True:
        time.sleep(0.5)
        if GPIO.input(24) == 1:
            if p is None:
                print("Preparing to recorde")
                today = datetime.datetime.now()
                time1 = "{}.{}.{}_{}:{}:{}".format(today.day , today.month, today.year, today.hour, today.minute, today.second)
                # Aufname starten
                command = "sh -c 'ffmpeg -f pulse -nostdin -i alsa_input.usb-FuZhou_Kingwayinfo_CO._LTD_TONOR_TC30_Audio_Device_20200707-00.mono-fallback /home/pi/sound_recorder/Recordes/'" + time1 + ".mp3"
                print(command)
                #subprocess.Popen(command)
                p = subprocess.Popen(command, stdout=subprocess.PIPE, 
                       shell=True, preexec_fn=os.setsid)
                print("Recording...")
                GPIO.output(23, GPIO.HIGH)
                time.sleep(2)    

            else:
                print("Terminate")
                os.killpg(os.getpgid(p.pid), signal.SIGTERM)
                GPIO.output(23, GPIO.LOW)
                p = None
                time.sleep(2)