I am working on a project involving libvlc.
Until now, I have been using the 2.2.x stable branch. But I strongly need two features that made me pass to libvlc 3.0.0 (nightly build May 27 2017): grab a frame from an mp4 file and stream a list of files to RTP. Both of these features deadlock using libvlc 2.2.5.1.
Now I am a little baffled: a feature that used to work well in libvlc 2.2.5.1 is not working anymore. That is, saving an RTSP stream into an MP4 file.
The code would be like this:
const char * const args1[] = {
"--sout", transcode.c_str(),
msecDelay.c_str()
};
size_t argsCount1 = sizeof(args1) / sizeof(args1[0]);
it->second.p_lib = libvlc_new(argsCount, p_args);
with the string named transcode like:
transcode = "#transcode{acodec=mp3}:duplicate{ dst=file{ dst=" + string(it->second.fDump) + " }, dst=display }";
Now, when I execute the same code with libvlc 3.0.0 I can see the video, alas no file.
Any idea of what I am doing wrong?
Thank you in advance,
Antonio
Related
I have added this (https://github.com/kewlbear/FFmpeg-iOS-build-script) version of ffmpeg to my project. I can't see the entry point to the library in the headers included.
How do I get access to the same text command based system that the stand alone application has, or an equivalent?
I would also be happy if someone could point me towards documentation that allows you to use FFmpeg without the command line interface.
This is what I am trying to execute (I have it working on windows and android using the CLI version of ffmpeg)
ffmpeg -framerate 30 -i snap%03d.jpg -itsoffset 00:00:03.23333 -itsoffset 00:00:05 -i soundEffect.WAV -c:v libx264 -vf fps=30 -pix_fmt yuv420p result.mp4
Actually you can build ffmpeg library including the ffmpeg binary's code (ffmpeg.c). Only thing to care about is to rename the function main(int argc, char **argv), for example, to ffmpeg_main(int argc, char **argv) - then you can call it with arguments just like you're executing ffmpeg binary. Note that argv[0] should contain program name, just "ffmpeg" should work.
The same approach was used in the library VideoKit for Android.
To do what you want, you have to use your compiled FFmpeg library in your code.
What you are looking for is exactly the code providing by FFmpeg documentation libavformat/output-example.c (that mean AVFormat and AVCodec FFmpeg's libraries in general).
Stackoverflow is not a "do it for me please" platform. So I prefer explaining here what you have to do, and I will try to be precise and to answer all your questions.
I assume that you already know how to link your compiled (static or shared) library to your Xcode project, this is not the topic here.
So, let's talk about this code. It creates a video (containing video stream and audio stream randomly generated) based on a duration. You want to create a video based on a picture list and sound file. Perfect, there are only three main modifications you have to do:
The end condition is not reaching a duration, but reaching the end of your file list (In code there is already a #define STREAM_NB_FRAMES you can use to iterate over all you frames).
Replace the dummy void fill_yuv_image by your own method that load and decode image buffer from file.
Replace the dummy void write_audio_frame by your own method that load and decode the audio buffer from your file.
(you can find "how to load audio file content" example on documentation starting at line 271, easily adaptable for video content regarding documentation)
In this code, comparing to your CLI, you can figure out that:
const char *filename; in the main should be you output file "result.mp4".
#define STREAM_FRAME_RATE 25 (replace it by 30).
For MP4 generation, video frames will be encoded in H.264 by default (in this code, the GOP is 12). So no need to precise libx264.
#define STREAM_PIX_FMT PIX_FMT_YUV420P represents your desired yuv420p decoding format.
Now, with these official examples and related documentation, you can achieve what you desire. Be careful that there is some differences between FFmpeg's version in these examples and current FFmpeg's version. For example:
st = av_new_stream(oc, 1); // line 60
Could be replaced by:
st = avformat_new_stream(oc, NULL);
st->id = 1;
Or:
if (avcodec_open(c, codec) < 0) { // line 97
Could be replaced by:
if (avcodec_open2(c, codec, NULL) < 0) {
Or again:
dump_format(oc, 0, filename, 1); // line 483
Could be replaced by:
av_dump_format(oc, 0, filename, 1);
Or CODEC_ID_NONE by AV_CODEC_ID_NONE... etc.
Ask your questions, but you got all the keys! :)
MobileFFMpeg is an easy to use pod for the purpose. Instructions on how to use MobileFFMpeg at: https://stackoverflow.com/a/59325680/1466453
MobileFFMpeg gives a very simple method for translating ffmpeg commands to your IOS objective-c program.
Virtually all ffmpeg commands and switches are supported. However you have to get the pod with appropriate license. e.g min-gpl will not give you features of libiconv. libiconv is convered in vidoe, gpl and full-gpl licenses.
Please highlight if you have specific issues regarding use of MobileFFMpeg
i'm trying to record a webcam, save it and stream it to a local network.
The Problem is, i want to do this with different compression:
The stream for the local network should only have <400kbit/s, but the other one, which is stored to a local file, should be uncompressed or with up to 10 Mbit/s
So i tried two methods to solve this:
First i played a little bit with the VLC Gui. It is really easy to record the Webcam, then transcode it and save it to a file or/and stream it to the internet. The command line looks like this:
vlc v4l2:///dev/video0 :v4l2-standard= :live-caching=300 :sout="#transcode{vcodec=WMV2,vb=380,fps=1,scale=Automatisch,acodec=none}:duplicate{dst=file{dst=stream.asf,no-overwrite},dst=http{dst=:8080/stream.wmv}}" :sout-keep
But i had the problem that both, the internet stream and the file, are getting compressed. So i changed the order of "duplicate" and "transcode" to:
vlc v4l2:///dev/video0 :v4l2-standard= :live-caching=300 :sout="#duplicate{dst=file{dst=stream.asf,no-overwrite}, dst="transcode{vcodec=WMV2,vb=380,fps=1,scale=Automatisch,acodec=none}:http{dst=:8080/stream.wmv}"}" :sout-keep
My thought: Now i should have a compressed internet stream and the orignal file. But it doesn't stream it to the internet.
So i tried another method: I wanted to stream the original stream to port 8080 and then use two other VLC instances to generate a compressed network stream to port 8008 and a original file. But i cant stream a stream....
So i would be really thankful, if someone has another idea or a hint where my problem is.
Sorry for my english.
Have a nice day.
You are double quoting the :sout. If you plan to use quotes " inside the value then use apostrophe ' to enclose the whole argument like:
:sout='#duplicate{dst=file{...}, dst="transcode{...}:http{dst=:8080/stream.wmv}"}'
If you add a -v (verbose output) at the end of your command you'll see some other issues too like no-overwrite not being recognized. Also,scale=Automatisch should be scale=auto.
Please note that I checked just the syntax and not your encoding parameters.
We are converting word to pdf using the openoffice(3.4.1 version) in java with JODConverter.
below is the code used.
OpenOfficeConnection connection =
new SocketOpenOfficeConnection(2100);
try
{
connection.connect();
DocumentConverter converter =
new OpenOfficeDocumentConverter(connection);
converter.convert(inputFile, outputFile);
connection.disconnect();
return "Sucess " + DestinationPath + DestinationFileName;
}
catch (Exception localException1) {
}
The problem is that after random no of days the converted PDF contains the garbled fonts.
like # # ! $ $ " % &
The only solution we have so far is to restart the server. System guys are saying the the problem is with Open Office.
We are using open office to convert the document since it converts the doc files exactly including all the formatting and table structure.
what could be the solution to this.
So OpenOffice can be a little temperamental when running on a server, especially as it isn't multi-threaded and you end up having to run a pool of OpenOffice processes - see How can I use OpenOffice in server mode as a multithreaded service?.
Added to that often the rendering is off when converting to PDF - see https://forum.openoffice.org/en/forum/viewtopic.php?f=7&t=68865 which is why you may want to consider using a conversion service to automate the conversion tasks for you ?
For complete transparency I work for Zamzar (an online file conversion service), we have recently released a developer API - https://developers.zamzar.com/ that allows you to convert between a multitude of file types, specifically applicable to you here in that we support both doc and docx to pdf with little or not loss in the way the PDF is rendered. It maybe worth a look to see if this is a better alternative to trying to run your own solution through OpenOffice on a server.
I'm trying to figure out how to convert an image from a stream with ImageResizer (http://imageresizing.net/).
I have tried something like this.
Stream s = WebRequest.Create("http://example.com/resources/gfx/unnamed.webp").GetResponse().GetResponseStream();
ImageBuilder.Current.Build(s, "~/resources/gfx/photo3.png", new ResizeSettings("format=png"));
But i just get the error
"File may be corrupted, empty, or may contain a PNG image with a single dimension greater than 65,535 pixels."
When i do
using (Stream output = File.OpenWrite(Server.MapPath("~/resources/gfx/test.webp")))
using (Stream input = WebRequest.Create("http:///example.com/resources/gfx/unnamed.webp").GetResponse().GetResponseStream()) {
input.CopyTo(output);
}
ImageBuilder.Current.Build("~/resources/gfx/test.webp", "~/resources/gfx/photo3.png",
new ResizeSettings("format=png"));
It works fine, am i'm missing something here?
It's possible that 'output' has not been flushed to disk. .NET 4+ doesn't guarantee the file's actually written to disk just because you disposed the stream.
I assume you have the ImageResizer.Plugins.WebP plugin installed?
This is a beginner question, since I am new to iOS(I started it today), so please pardon my ignorance and lack of iOS knowledge.
After building and successfully using FFMpeg for Android I wanted to do the same for iOS.
So I built FFMpeg successfully for iOS by following this link, but after all that pain I am confused as how to use FFMpeg in iOS, I mean how can I pass command line arguments to libffmpeg.a file?
I am assuming that there must be a way to run the .a file as an executable and then pass command line arguments and hope for FFMpeg to do the magic, I did the same in Android and it worked beautifully.
I am also aware that I can use ffmpeg.c class and use its main method, but the question remains; how do I pass those command line arguments?
Is there something I am supposed to be aware of here, is the thing what I am doing now correct or am I falling short on my approach?
I wanted to mix two audio files, so the command for doing that would be ffmpeg -i firstSound.wav -i secondSound.wav -filter_complex amix=inputs=2:duration=longest finalOutput.wav, how do I do the same in iOS?
Can someone please shed some light on this?
You don't pass arguments to a .a file as it's a library file. It's something you build your application with, giving you access to the functions provided by the ffmpeg library. I'm not sure what the state of play with Android is but it's likely it's generating a command line executable instead.
Have a look at the ffmpeg documentation, there's probably a way to do what you want with the library, however building and running ffmpeg as a standalone, pass-in-arguments, binary is unlikely.
You can do it in your main.c, and of course you wouldn't hardcode args these are just for illustration
I assume your using ffmpeg for playback since your playing with iframeextractor, what actually is the goal of what your trying to do.
/* Called from the main */
int main(int argc, char **argv)
int flags, i;
/*
argv[1] = "-fs";
argv[2] = "-skipframe";
argv[3] = "30";
argv[4] = "-fast";
argv[5] = "-sync";
argv[6] = "video";
argv[7] = "-drp";
argv[8] = "-skipidct";
argv[9] = "10";
argv[10] = "-skiploop";
argv[11] = "50";
argv[12] = "-threads";
argv[13] = "5";
//argv[14] = "-an";
argv[15] = "http://172.16.1.33:63478/hulu-f4fa0821-767a-490a-8cb5-f03788760e31/1-hulu-f4fa0821-767a-490a-8cb5-f03788760e31.mpg";
argc += 14;
*/
/* register all codecs, demux and protocols */
avcodec_register_all();
avdevice_register_all();
av_register_all();
parse_options(argc, argv, options, opt_input_file);
. .. mo
}