Advanced search

On other websites (4349)

• ffmpeg continuous live streaming of dynamic files from directory

  4 September 2022, by user72261

  So I have been using ffmpeg to create a live stream from files stored in a folder using concat list.

  


  This works perfectly for local, static content but I have a security system in my warehouse that uploads .mp4 files to my server in the office.

  


  This system doesn't have any live stream functionality so I would like to set up a live stream myself using ffmpeg to continually read the latest files from the folder.

  


  I tried setting up a script to read all files in the directory and sort them based on the file name that is a UNIX timestamp of the date/time the video was taken. Then had the script select the latest segments after that last used segment and create a new concat list such as below

  


  file '00000.mpd'
file '00001.mp4'
file '00002.mp4'
file '00003.mp4'
file '00004.mp4'


  


  After doing some reading I found out to make it loop that file you could reference its self in the list like so

  


  file '00000.mpd'
file '00001.mp4'
file '00002.mp4'
file '00003.mp4'
file '00004.mp4'
file 'concat.txt'


  


  This seemed to work ok until I started getting the error impossible to open concat.txt. This file doesn't exist, which I can only guess is because ffmpeg is trying to open the file as its being updated by the script.

  


  Has anyone come across this before or know another way to do it?

  


• Sending frames from memory to FFMPEG command line program .NET 6

  15 September 2021, by Alessandro Martinelli

  I'm trying to use the pipe to send frames generated by my program to ffmpeg command line utility without saving them on disk. Please note I was able to generate a video by first saving frames on disk as images and then having FFMPEG generate a video from such images, but that approach is worse performance-wise and implies writing more data on SSD.

  


  I could use the help of this post, but I have FFMPEG returning an error on frame size, and I don't know how to solve it.

  


  My code is the following:

  


  //object storing single frame returned from camera
mv.impact.acquire.Request pRequest; 
string outputPath = ...;
List frames = new List();

[...]

// Single frame is saved into memory
MemoryStream stream = new MemoryStream();
using (RequestBitmapData data = pRequest.bitmapData) {
    data.bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
    // Please note that now printing data.bitmap.PixelFormat would return Format24bppRgb
}
frames.Add(stream.ToArray());

[...] 

Console.WriteLine(frames.Count + " frames collected. First one length is " + frames.First().Length);

string ffmpegArgument = "/C " + _ffmpegPath + "\\ffmpeg -y -f rawvideo -pix_fmt rgb24 -framerate 3 -video_size 728x544 -i - -c:v libx264 -preset 9 -c:a libvo_aacenc " + outputPath;

Process cmd = new Process();
cmd.StartInfo.FileName = "cmd.exe";
cmd.StartInfo.Arguments = ffmpegArgument;
cmd.StartInfo.UseShellExecute = false;
cmd.StartInfo.RedirectStandardError = false;
cmd.StartInfo.RedirectStandardInput = true;

Console.WriteLine("Executing command " + ffmpegArgument + "...");
cmd.Start();
foreach (byte[] frame in frames) {
        cmd.StandardInput.Write(frame);
}
cmd.StandardInput.Flush();
cmd.StandardInput.Close();


  


  However, when I execute the program, I have the following output:

  


  492 frames collected. First one length is 1188150
Executing command /C ExternalTools\FFmpeg\ffmpeg -y -f rawvideo -pix_fmt rgb24 -framerate 32 -video_size 728x544 -i - -c:v libx264 -preset ultrafast -c:a libvo_aacenc -b:a 128k "Output\TemporaryVideo\2021-09-13 18_58_58.mp4"...
ffmpeg version 2021-06-27-git-49e3a8165c-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.3.0 (Rev2, Built by MSYS2 project)

[...] (configurations)

[rawvideo @ 00000241d34feac0] Packet corrupt (stream = 0, dts = 0).
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, start: 0.000000, bitrate: 304152 kb/s
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 728x544, 304152 kb/s, 32 tbr, 32 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
pipe:: corrupt input packet in stream 0
[rawvideo @ 00000241d3511640] Invalid buffer size, packet size 6396 < expected frame_size 1188096
Error while decoding stream #0:0: Invalid argument

[...] (cpu capabilities)

Output #0, mp4, to 'Output\TemporaryVideo\2021-09-13 18_58_58.mp4':
  Metadata:
    encoder         : Lavf59.3.101
  Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv444p, 728x544, q=2-31, 32 fps, 16384 tbn
    Metadata:
      encoder         : Lavc59.2.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!


  


  The value expected by FFMPEG seems correct (1188096 = 728 x 544 x 3), but I don't understand where FFMPEG gets that "packet size 6396" from. Furthermore, that value (6396) changes at every program execution.

  


  I'm pretty sure frames are not corrupted since, if I save such frames on disk, the image is generated correctly.

  


  Thank you for your time,
Alessandro

  


• discord.py Heroku FFmpeg issue

  6 April 2022, by No.BoD

  hi I'm trying to deploy a discord bot on heroku. i'm using ffmpeg to stream music to a voice channel. i tried it local on my windows and got it working but when I deployed it on heroku, throws this exception and says nothing!

  


  I use these buildpacks:

  


  

  1. heroku/python

  


  2. https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git

  


  


  I appreciate if someone can help
  
here's a sample code:

  


  vid = pafy.new("https://www.youtube.com/watch?v=gdL7s0kw0SM")
print("Pafy Vid Created!")
audio = vid.getbestaudio()
print("Pafy Audio Created!")
try:
    // self.FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
    self.vc[ctx.guild.id].play(FFmpegPCMAudio(Song['source'], **self.FFMPEG_OPTIONS), after=lambda _: E.set())
    print("Playing Music!!!")
except Exception as ex:
    print(ex)


  


  and here's what I got:

  


  2021-09-20T14:31:19.958645+00:00 app[worker.1]: Pafy Vid Created!
2021-09-20T14:31:19.958889+00:00 app[worker.1]: Pafy Audio Created!
2021-09-20T14:31:20.447278+00:00 app[worker.1]: