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Spitfire Parade - Crisis
15 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Wired NextMusic
14 mai 2011, par
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Langue : English
Type : Video
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Video d’abeille en portrait
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Mis à jour : Février 2012
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Sintel MP4 Surround 5.1 Full
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Mis à jour : Février 2012
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Publier une image simplement
13 avril 2011, par ,
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Langue : français
Type : Video
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Sur d’autres sites (6556)
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Output file using FFmpeg in Xamarin Android
28 juillet 2022, par Ahmed MujtabaI'm building an android app using Xamarin. The requirement of the app is to capture video from the camera and encode the video to send it across to a server.



Initially, I was using an encoder library on the server-side to encode recorded video but it was proving to be extremely unreliable and inefficient especially for large-sized video files. I have posted my issues on another thread here



I then decided to encode the video on the client-side and then send it to the server. I've found encoding to be a bit complicated and there isn't much information available on how this can be done. So, I searched for the only way I knew how to encode a video that is by using FFmpeg codec. I've found some solutions. There's a project on GitHub that demonstrates how FFmpeg is used inside a Xamarin android project. However, running the solution doesn't give any output. The project has a binary FFmpeg file which is installed to the phone directory using the code below :



_ffmpegBin = InstallBinary(XamarinAndroidFFmpeg.Resource.Raw.ffmpeg, "ffmpeg", false);



Below is the example code for encoding video into a different set of outputs :



_workingDirectory = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
var sourceMp4 = "cat1.mp4";
var destinationPathAndFilename = System.IO.Path.Combine (_workingDirectory, "cat1_out.mp4");
var destinationPathAndFilename2 = System.IO.Path.Combine (_workingDirectory, "cat1_out2.mp4");
var destinationPathAndFilename4 = System.IO.Path.Combine (_workingDirectory, "cat1_out4.wav");
if (File.Exists (destinationPathAndFilename))
 File.Delete (destinationPathAndFilename);
CreateSampleFile(Resource.Raw.cat1, _workingDirectory, sourceMp4);


var ffmpeg = new FFMpeg (this, _workingDirectory);

var sourceClip = new Clip (System.IO.Path.Combine(_workingDirectory, sourceMp4));

var result = ffmpeg.GetInfo (sourceClip);

var br = System.Environment.NewLine;

// There are callbacks based on Standard Output and Standard Error when ffmpeg binary is running as a process:

var onComplete = new MyCommand ((_) => {
 RunOnUiThread(() =>_logView.Append("DONE!" + br + br));
});

var onMessage = new MyCommand ((message) => {
 RunOnUiThread(() =>_logView.Append(message + br + br));
});

var callbacks = new FFMpegCallbacks (onComplete, onMessage);

// 1. The idea of this first test is to show that video editing is possible via FFmpeg:
// It results in a 150x150 movie that eventually zooms on a cat ear. This is desaturated, and there's a fade-in.

var filters = new List<videofilter> ();
filters.Add (new FadeVideoFilter ("in", 0, 100));
filters.Add(new CropVideoFilter("150","150","0","0"));
filters.Add(new ColorVideoFilter(1.0m, 1.0m, 0.0m, 0.5m, 1.0m, 1.0m, 1.0m, 1.0m));
var outputClip = new Clip (destinationPathAndFilename) { videoFilter = VideoFilter.Build (filters) };
outputClip.H264_CRF = "18"; // It's the quality coefficient for H264 - Default is 28. I think 18 is pretty good.
ffmpeg.ProcessVideo(sourceClip, outputClip, true, new FFMpegCallbacks(onComplete, onMessage));

//2. This is a similar version in command line only:
string[] cmds = new string[] {
 "-y",
 "-i",
 sourceClip.path,
 "-strict",
 "-2",
 "-vf",
 "mp=eq2=1:1.68:0.3:1.25:1:0.96:1",
 destinationPathAndFilename2,
 "-acodec",
 "copy",
};
ffmpeg.Execute (cmds, callbacks);

// 3. This lists codecs:
string[] cmds3 = new string[] {
 "-codecs",
};
ffmpeg.Execute (cmds, callbacks);

// 4. This convers to WAV
// Note that the cat movie just has some silent house noise.
ffmpeg.ConvertToWaveAudio(sourceClip, destinationPathAndFilename4, 44100, 2, callbacks, true);
</videofilter>


I have tried different commands but no output file is generated. I have tried to use another project found here but this one has the same issue. I don't get any errors but no output file is generated. I'm really hoping someone can help me find a way I can manage to use FFmpeg in my project or some way to compress video to transport it to the server.



I will really appreciate if someone can point me in the right direction.


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How can I concatenate these two video files that are in different formats with ffmpeg ?
11 juin 2018, par jaybersFile s.mp4 is created from a photo and a silent audio track was added in.
File r.mp4 was created using the built in video record on an android tablet.I would like to try to match s.mp4 to r.mp4 so that they can concatenate (s then r). Right now, the time base seems off and it plays audio from the r.mp4 but never shows the video. It it always shows the video from s.mp4. I was able to match the tbn of 90k by using
-video_track_timescale 90kbut I did not know how to match the tbc. It is 180k on one and 59.94 on the other.Probe for s.mp4
./ffprobe s.mp4
ffprobe version 4.0-tessus Copyright (c) 2007-2018 the FFmpeg developers
built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 's.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.25.100
Duration: 00:00:05.04, start: 0.000000, bitrate: 296 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 286 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
Metadata:
handler_name : SoundHandlerProbe for r.mp4
./ffprobe r.mp4
ffprobe version 4.0-tessus Copyright (c) 2007-2018 the FFmpeg developers
built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
libavutil 56. 14.100 / 56. 14.100
libavcodec 58. 18.100 / 58. 18.100
libavformat 58. 12.100 / 58. 12.100
libavdevice 58. 3.100 / 58. 3.100
libavfilter 7. 16.100 / 7. 16.100
libswscale 5. 1.100 / 5. 1.100
libswresample 3. 1.100 / 3. 1.100
libpostproc 55. 1.100 / 55. 1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'r.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2018-06-11T20:12:03.000000Z
com.android.version: 7.0
Duration: 00:00:10.89, start: 0.000000, bitrate: 17087 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/smpte170m), 1920x1080, 16810 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2018-06-11T20:12:03.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
creation_time : 2018-06-11T20:12:03.000000Z
handler_name : SoundHandle -
ffmpeg merge video and audio + fade out
1er mai 2016, par jacky brownI have one video file and one audio file.
I want to merge them together that the final output video will be in the length of the video and will contain the audio in the background.i did :
ffmpeg -i output.avi -i bgmusic.mp3 -filter_complex " [1:0] apad " -shortest out.avibut the background audio is cut in the end of the final merge movie.
i want it to fade out nicely.how can i do it ??
but the background audio is cut in the end of the final merge movie.
i want it to fade out nicely.how can i do it ??
thanks.
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