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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (58)
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Sur d’autres sites (8372)
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UVC webcam with ffplay outputs only noise ?
1er mars 2024, par Abdulla Masud(My end goal is to use a UVC webcam with esp32 or raspberry pi. I was hoping to learn while doing some fun projects.)


I have an old UVC webcam (Creative model ct6840) but I can't seem to get it to work with
ffplay. I have tried looking through the documentation and other questions here but nothing is working for me. So far I have only been able to achieve a noisy-jittery output.

Running
ffplay -f rawvideo -video_size 670x480 /dev/video1, I get :



Can someone help me understand how to make the camera work with
ffplay?

The following is the information of my webcam :


$ ffmpeg -f v4l2 -list_formats all -i /dev/video2

[video4linux2,v4l2 @ 0x17eb3c0] Compressed: Unsupported : GSPCA OV511 : 320x240 640x480


$ v4l-info /dev/video2

### v4l2 device info [/dev/video2] ###
general info
 VIDIOC_QUERYCAP
 driver : "ov519"
 card : "USB Camera (05a9:0511)"
 bus_info : "usb-0000:00:14.0-8.2"
 version : 6.1.79
 capabilities : 0x85200001 [VIDEO_CAPTURE,?,READWRITE,STREAMING,(null)]

standards

inputs
 VIDIOC_ENUMINPUT(0)
 index : 0
 name : "ov519"
 type : CAMERA
 audioset : 0
 tuner : 0
 std : 0x0 []
 status : 0x0 []

video capture
 VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
 index : 0
 type : VIDEO_CAPTURE
 flags : 1
 description : "GSPCA OV511"
 pixelformat : 0x3131354f [O511]
 VIDIOC_G_FMT(VIDEO_CAPTURE)
 type : VIDEO_CAPTURE
 fmt.pix.width : 640
 fmt.pix.height : 480
 fmt.pix.pixelformat : 0x3131354f [O511]
 fmt.pix.field : NONE
 fmt.pix.bytesperline : 640
 fmt.pix.sizeimage : 614400
 fmt.pix.colorspace : JPEG
 fmt.pix.priv : 4276996862

controls
 VIDIOC_QUERYCTRL(BASE+0)
 id : 9963776
 type : INTEGER
 name : "Brightness"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 48
 VIDIOC_QUERYCTRL(BASE+1)
 id : 9963777
 type : INTEGER
 name : "Contrast"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 32
 VIDIOC_QUERYCTRL(BASE+2)
 id : 9963778
 type : INTEGER
 name : "Saturation"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 32
 VIDIOC_QUERYCTRL(BASE+24)
 id : 9963800
 type : MENU
 name : "Power Line Frequency"
 minimum : 0
 maximum : 2
 step : 1
 default_value : 0
 flags : 0
 VIDIOC_QUERYCTRL(BASE+32)
 id : 9963808
 type : BOOLEAN
 name : "Brightness, Automatic"
 minimum : 0
 maximum : 1
 step : 1
 default_value : 1
 flags : 8


Can someone guide me here please ? Any advice will be greatly appreciated


(P.S. the camera works perfectly with "guvcview" gtk application but since I want to use the camera with raspberry pi, I want it to work with ffplay...)


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Unable to split audio using easy_audio_trimmer
27 juillet 2023, par Sana Wasimcan we use the easy_audio_trimmer package to split an audio ? I tried using the ffmpeg but it is conflicting with the above package and not work.


I tried splitting by using these functions and it gave an error at the FlutterFFmpeg() method and i cant find an alternative also the duration(filePath) in the command final durationResult = await flutterSound.duration(filePath) ; shows an error


Future<void> _splitAudio() async {
 setState(() {
 _progressVisibility = true;
 });

 // Get the application documents directory
 final appDocumentsDirectory = await getApplicationDocumentsDirectory();

 // Get the input audio file path
 final inputAudioPath = widget.file.path;

 // Get the output file names for the two parts
 final outputFileName1 = 'split_audio_part1.mp3';
 final outputFileName2 = 'split_audio_part2.mp3';

 // Get the output file paths for the two parts
 final outputPath1 = '${appDocumentsDirectory.path}/$outputFileName1';
 final outputPath2 = '${appDocumentsDirectory.path}/$outputFileName2';

 // Calculate the duration of the original audio
 final originalDuration = await _getAudioDuration(inputAudioPath);

 // Calculate the durations of the two parts
 final part1Duration = _startValue;
 final part2Duration = originalDuration - _endValue;

 // Construct the FFmpeg command to split the audio
 final ffmpeg = FlutterFFmpeg();
 final splitCommand = '-i $inputAudioPath -ss 0 -t $part1Duration -c copy $outputPath1 -ss $_endValue -t $part2Duration -c copy $outputPath2';

 try {
 // Execute the FFmpeg command to split the audio
 final int result = await ffmpeg.execute(splitCommand);

 if (result == 0) {
 setState(() {
 _progressVisibility = false;
 });
 debugPrint('Audio split successfully.');
 } else {
 setState(() {
 _progressVisibility = false;
 });
 debugPrint('Failed to split audio.');
 }
 } catch (error) {
 setState(() {
 _progressVisibility = false;
 });
 debugPrint('Error while splitting audio: $error');
 }
 }

 Future<int> _getAudioDuration(String filePath) async {
 final flutterSound = FlutterSound();
 final durationResult = await flutterSound.duration(filePath);
 return durationResult.inMilliseconds;
 }
</int></void>

Dependencies


path_provider: ^2.0.15
 ffmpeg_kit_flutter: ^5.1.0
 audioplayers: ^4.1.0
 flutter_sound: ^9.2.13


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FFMPEG : Converting from raw audio to audio/mp4 (audio is being converted with slow speed)
29 décembre 2017, par ValdirIf I convert from mp3 to mp4 directly everything works perfectly. But if I try to convert from raw pcm, the audio speed is slowed down.
I’ve tried the following (this works) :
ffmpeg -i mp3/1.mp3 -strict -2 final.mp4This doesn’t work as expected :
ffmpeg -f s16le -i final.raw -strict -2 -r 26 final.mp4With the following output :
Input #0, s16le, from 'final.raw':
Duration: 00:08:37.38, bitrate: 705 kb/s
Stream #0:0: Audio: pcm_s16le, 44100 Hz, 1 channels, s16, 705 kb/s
File 'final.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'final.mp4':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 128 kb/s
Metadata:
encoder : Lavc56.60.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
size= 8273kB time=00:08:37.38 bitrate= 131.0kbits/s
video:0kB audio:8185kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.073808%I’ve tried to set parameters like :
ffmpeg -ar 44100 -f s16le -i final.raw -strict -2 -r 26 final.mp4With no luck.
In order to get the PCM from mp3 I’m using nodejs lame decoder :
var decoder = new lame.Decoder({
channels: 2,
bitDepth: 16,
sampleRate: 44100,
bitRate: 128,
outSampleRate: 44100, // 22050
mode: lame.STEREO
});
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