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Médias (2)
-
Core Media Video
4 avril 2013, par
Mis à jour : Juin 2013
Langue : français
Type : Video
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Video d’abeille en portrait
14 mai 2011, par
Mis à jour : Février 2012
Langue : français
Type : Video
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Emballe médias : à quoi cela sert ?
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Par défaut trois menus sont créés automatiquement à l’initialisation du site : Le menu principal ; Identifiant : barrenav ; Ce menu s’insère en général en haut de la page après le bloc d’entête, son identifiant le rend compatible avec les squelettes basés sur Zpip ; (...)
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When i used ffmpeg to trim a video ,i observed an error [closed]
6 mars 2020, par israfillli wanna use ffmpeg to trim a video but when i build app i see this I/System.out : ssssCANNOT LINK EXECUTABLE "/data/user/0/com.example.newapplication/files/ffmpeg" : "/data/data/com.example.newapplication/files/ffmpeg" has text relocations (https://android.googlesource.com/platform/bionic/+/master/androg-’changes-for-ndk-developers.md#Text-Relocations-Enforced-for-API-level-23)
why didn’t i use this library
public class MainActivity extends AppCompatActivity {
String outPutFile;
Uri filePath, filePathSecond, photoUri, AudioUri;
ProgressDialog progressDialog;
private int REQUEST_TAKE_GALLERY_VIDEO = 110;
private int REQUEST_TAKE_GALLERY_VIDEO_2 = 115;
private FFmpeg ffmpeg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);
}
progressDialog = new ProgressDialog(this);
findViewById(R.id.selectVideo).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("video/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Video"), REQUEST_TAKE_GALLERY_VIDEO);
}
});
findViewById(R.id.start).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (filePath != null) {
executeCutVideoCommand(1000, 4 * 1000, filePath);
}
}
});
findViewById(R.id.marge_video).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (filePath != null && filePathSecond != null)
executeMargeVideoCommand(filePath, filePathSecond);
}
});
findViewById(R.id.selectVideo_2).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("video/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Video"), REQUEST_TAKE_GALLERY_VIDEO_2);
}
});
findViewById(R.id.filter_video).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(filePath!=null){
executeFilterCommand(filePath);
}
}
});
loadFFMpegBinary();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_TAKE_GALLERY_VIDEO) {
Uri uri = data.getData();
if (uri != null) {
filePath = uri;
}
}
if (requestCode == REQUEST_TAKE_GALLERY_VIDEO_2) {
Uri uri = data.getData();
if (uri != null) {
filePathSecond = uri;
}
}
}
// video trim
private void executeCutVideoCommand(int startMs, int endMs, Uri filePath) {
File moviesDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MOVIES
);
String filePrefix = "cut_video";
String fileExtn = ".mp4";
String yourRealPath = getPath(MainActivity.this, filePath);
File dest = new File(moviesDir, filePrefix + fileExtn);
int fileNo = 0;
while (dest.exists()) {
fileNo++;
dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
}
/* Log.d(TAG, "startTrim: src: " + yourRealPath);
Log.d(TAG, "startTrim: dest: " + dest.getAbsolutePath());
Log.d(TAG, "startTrim: startMs: " + startMs);
Log.d(TAG, "startTrim: endMs: " + endMs);*/
outPutFile = dest.getAbsolutePath();
//String[] complexCommand = {"-i", yourRealPath, "-ss", "" + startMs / 1000, "-t", "" + endMs / 1000, dest.getAbsolutePath()};
String[] complexCommand = {"-ss",
"" + (startMs / 1000),
"-y",
"-i",
yourRealPath,
"-t",
"" + ((endMs - startMs) / 1000),
"-vcodec",
"mpeg4",
"-b:v",
"2097152",
"-b:a",
"48000",
"-ac",
"2",
"-ar",
"22050",
outPutFile};
execFFmpegBinary(complexCommand);
}
private String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{
split[1]
};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
}
return null;
}
private boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
private boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
private boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
private String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
private void loadFFMpegBinary() {
try {
if (ffmpeg == null) {
ffmpeg = FFmpeg.getInstance(this);
}
ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
@Override
public void onFailure() {
}
@Override
public void onSuccess() {
}
});
} catch (FFmpegNotSupportedException e) {
} catch (Exception e) {
}
}
private void execFFmpegBinary(final String[] command) {
progressDialog.show();
try {
ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
@Override
public void onFailure(String s) {
System.out.println("ssss"+s);
}
@Override
public void onSuccess(String s) {
// Log.d(TAG, "SUCCESS with output : " + s);
Toast.makeText(MainActivity.this, "SUCCESS" + outPutFile, Toast.LENGTH_LONG).show();
}
@Override
public void onProgress(String s) {
}
@Override
public void onStart() {
progressDialog.setMessage("Processing...");
progressDialog.show();
}
@Override
public void onFinish() {
progressDialog.dismiss();
}
});
} catch (Exception e ) {
Toast.makeText(MainActivity.this, "EXCEPTION", Toast.LENGTH_LONG).show();
// do nothing for now
}
}
private void executeMargeVideoCommand(Uri filePath, Uri filePathSecond) {
File moviesDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MOVIES
);
String filePrefix = "marge_change_video";
String fileExtn = ".mp4";
String yourRealPath = getPath(MainActivity.this, filePath);
String yourRealPath2 = getPath(MainActivity.this, filePathSecond);
File dest = new File(moviesDir, filePrefix + fileExtn);
int fileNo = 0;
while (dest.exists()) {
fileNo++;
dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
}
outPutFile = dest.getAbsolutePath();
String complexCommand[] = {"-y", "-i", yourRealPath, "-i", yourRealPath2, "-strict", "experimental", "-filter_complex",
"[0:v]scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v0];[1:v] scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",
"-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1920x1080", "-vcodec", "libx264", "-crf", "27",
"-q", "4", "-preset", "ultrafast", outPutFile};
execFFmpegBinary(complexCommand);
}
private void executeFilterCommand(Uri filePath) {
File moviesDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MOVIES
);
String filePrefix = "filter_change_video";
String fileExtn = ".mp4";
String yourRealPath = getPath(MainActivity.this, filePath);
File dest = new File(moviesDir, filePrefix + fileExtn);
int fileNo = 0;
while (dest.exists()) {
fileNo++;
dest = new File(moviesDir, filePrefix + fileNo + fileExtn);
}
outPutFile = dest.getAbsolutePath();
// String complexCommand[] = {"-i", yourRealPath,"-r", "15", "-aspect" ,""+w+":"+""+h ,"-strict" ,"-2",outPutFile};
String complexCommand[] = { "-i",yourRealPath,"-vf", "split [main][tmp]; [tmp] lutyuv=","y=val*5"," [tmp2]; [main][tmp2] overlay", outPutFile};
execFFmpegBinary(complexCommand);
}}
-
Have problems using FFMPEG to save RGB image sequence to .mp4
28 septembre 2021, par ClubsI render some images with OpenGL and need to compose them into a video file. Each of the images is a sequence of uint8_t values representing a sRGB color component (image array looks like ...rgbrgbrgb...)



I know very little about video processing and have no experience with ffmpeg libraries at all. I made a little test program using these sources as reference :



https://ffmpeg.org/doxygen/trunk/encode_video_8c-example.html



How to convert RGB from YUV420p for ffmpeg encoder ?



The test program is supposed to make a video about growing green vertical stripe. I'm just trying to figure out how to make a video using some source of raw RGB data.



Here is my code :



#include <iostream>
#include <vector>
#include <algorithm>

extern "C" {
 #include <libavcodec></libavcodec>avcodec.h>
 #include <libavutil></libavutil>opt.h>
 #include <libavutil></libavutil>imgutils.h>
 #include <libswscale></libswscale>swscale.h>
}

static void encode( AVCodecContext* enc_ctx,
 AVFrame* frame, AVPacket* pkt,
 FILE* outfile )
{
 int ret;
 ret = avcodec_send_frame(enc_ctx, frame);
 if (ret < 0) {
 std::cerr << "Error sending a frame for encoding\n";
 return;
 }
 while (ret >= 0) {
 ret = avcodec_receive_packet(enc_ctx, pkt);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 return;
 else if (ret < 0) {
 fprintf(stderr, "Error during encoding\n");
 exit(1);
 }
 fwrite(pkt->data, 1, pkt->size, outfile);
 av_packet_unref(pkt);
 }
}

static constexpr int w = 1920, h = 1080;
static constexpr float fps = 20.f, time = 5.f;
static constexpr int nFrames = static_cast<int>(fps * time);
static std::vector imageRGB(w * h * 3, 0);

static void UpdateImageRGB()
{
 static int d = 50;
 imageRGB.assign(w * h * 3, 0);
 for (int i = 0; i < h; ++i)
 for ( int j = std::max(0, w / 2 - d);
 j < std::min(w, w / 2 + d);
 ++j )
 {
 imageRGB[(w * i + j) * 3 + 0] = 50;
 imageRGB[(w * i + j) * 3 + 1] = 200;
 imageRGB[(w * i + j) * 3 + 2] = 50;
 }
 d += 5;
}

int main()
{
 int ret = 0;
 auto filename = "test.mp4";

 auto codec = avcodec_find_encoder(AV_CODEC_ID_H264);
 if (!codec) {
 std::cerr << "Codec \"x.264\" not found\n";
 return 1;
 }
 auto c = avcodec_alloc_context3(codec);
 if (!c) {
 std::cerr << "Could not allocate video codec context\n";
 return 1;
 }
 auto pkt = av_packet_alloc();
 if (!pkt) return 1;

 // 1.8 bits / (pixel * frame)
 c->bit_rate = static_cast(1.8f * w * h * fps);
 /* resolution must be a multiple of two */
 c->width = w;
 c->height = h;
 /* frames per second */
 c->time_base = AVRational{ 1, static_cast<int>(fps) };
 c->framerate = AVRational{ static_cast<int>(fps), 1 };

 c->gop_size = 10;
 c->max_b_frames = 1;
 c->pix_fmt = AV_PIX_FMT_YUV420P;
 av_opt_set(c->priv_data, "preset", "slow", 0);
 av_opt_set(c->priv_data, "preset", "slow", 0);

 ret = avcodec_open2(c, codec, NULL);
 if (ret < 0) {
 char str[AV_ERROR_MAX_STRING_SIZE];
 std::cerr << "Could not open codec: "
 << av_make_error_string(str, AV_ERROR_MAX_STRING_SIZE, ret)
 << "\n";
 return 1;
 }

 FILE * f;
 fopen_s(&f, filename, "wb");
 if (!f) {
 std::cerr << "Could not open " << filename << '\n';
 return 1;
 }

 auto frame = av_frame_alloc();
 if (!frame) {
 std::cerr << "Could not allocate video frame\n";
 return 1;
 }
 frame->format = c->pix_fmt;
 frame->width = c->width;
 frame->height = c->height;
 ret = av_frame_get_buffer(frame, 0);
 if (ret < 0) {
 std::cerr << stderr, "Could not allocate the video frame data\n";
 return 1;
 }

 SwsContext* ctx = sws_getContext( w, h, AV_PIX_FMT_RGB24,
 w, h, AV_PIX_FMT_YUV420P,
 0, 0, 0, 0 );

 for (int i = 0; i < nFrames; i++)
 {
 ret = av_frame_make_writable(frame);
 UpdateImageRGB();
 static const uint8_t* rgbData[1] = { &imageRGB[0] };
 static constexpr int rgbLinesize[1] = { 3 * w };
 sws_scale( ctx, rgbData, rgbLinesize, 0, h,
 frame->data, frame->linesize );
 frame->pts = i;
 /* encode the image */
 encode(c, frame, pkt, f);
 }
 encode(c, NULL, pkt, f);

 fclose(f);
 avcodec_free_context(&c);
 av_frame_free(&frame);
 av_packet_free(&pkt);
 return 0;
}
</int></int></int></algorithm></vector></iostream>


The program generates 33.9k video file with further console output :



[libx264 @ 0000020c18681800] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000020c18681800] profile High, level 5.0, 4:2:0, 8-bit
[libx264 @ 0000020c18681800] frame I:11 Avg QP: 0.00 size: 639
[libx264 @ 0000020c18681800] frame P:74 Avg QP: 0.32 size: 174
[libx264 @ 0000020c18681800] frame B:15 Avg QP: 2.26 size: 990
[libx264 @ 0000020c18681800] consecutive B-frames: 70.0% 30.0%
[libx264 @ 0000020c18681800] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0000020c18681800] mb P I16..4: 0.6% 0.0% 0.0% P16..4: 2.1% 0.0% 0.0% 0.0% 0.0% skip:97.3%
[libx264 @ 0000020c18681800] mb B I16..4: 0.1% 0.0% 0.0% B16..8: 0.6% 0.0% 0.0% direct: 0.6% skip:98.7% L0:39.8% L1:60.2% BI: 0.0%
[libx264 @ 0000020c18681800] final ratefactor: -46.47
[libx264 @ 0000020c18681800] 8x8 transform intra:0.0%
[libx264 @ 0000020c18681800] direct mvs spatial:0.0% temporal:100.0%
[libx264 @ 0000020c18681800] coded y,uvDC,uvAC intra: 0.0% 0.1% 0.1% inter: 0.0% 0.1% 0.1%
[libx264 @ 0000020c18681800] i16 v,h,dc,p: 99% 0% 1% 0%
[libx264 @ 0000020c18681800] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 0% 0% 100% 0% 0% 0% 0% 0% 0%
[libx264 @ 0000020c18681800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 0% 54% 0% 0% 0% 0% 0% 0%
[libx264 @ 0000020c18681800] i8c dc,h,v,p: 96% 1% 3% 0%
[libx264 @ 0000020c18681800] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000020c18681800] ref P L0: 70.2% 0.0% 29.8% 0.0% 0.0%
[libx264 @ 0000020c18681800] kb/s:55.61



- 

- "Media Player Classic" on Windows plays this video but the time slider doesn't move, and the video cannot be fast-forwarded to some frame
- VLC cannot play the video at all. It launches, shows me VLC logo, and time slider (which is unusually big) jumps from left to right, not responding to my clicks
- If I set time = 0.05 to make a video of only 1 frame, I cannot play it even with "Media Player Classic". I want to make an algorithm to convert the arbitrary number of raw RGB images into the video files, even if there's only one image, and with arbitrary image size (that is, width and height may be odd).
- As I said, I don't really understand what am I doing. There are low-level codec settings in lines 83-84. Are they all right ?
- Do I have to manually set a bit rate (line 75) ? Shouldn't it be calculated automatically by the codec ?












-
ffmpeg merge multiple (N) mono audio channels of a MXF video to multiple (M) stereo channels of MP4 video
14 février 2020, par LauraI have an MXF file with 16 audio mono streams and I need to recode it in a mp4 file with 2<=n<=16 channels merging input streams, e.g. input channels 1 and 2 on output channel 1 and 9 and 10 on output channel 2. This job will be done with ffmpeg. I read the documentation and found the amerge and amix filters that would be nice, but they output one channel only. Is there any solution for this problem ?
Thanks,
LauraFind below the output of ffprobe on mxf file :
"streams" :[
"index":0,
"codec_name" :"mpeg2video",
"codec_long_name" :"MPEG-2 video",
"profile" :"4:2:2",
"codec_type" :"video",
"codec_time_base" :"1/25",
"codec_tag_string" :"[0][0][0][0]",
"codec_tag" :"0x0000",
"width":1920,
"height":1080,
"coded_width":0,
"coded_height":0,
"has_b_frames":1,
"sample_aspect_ratio" :"1:1",
"display_aspect_ratio" :"16:9",
"pix_fmt" :"yuv422p",
"level":2,
"color_range" :"tv",
"color_space" :"bt709",
"color_transfer" :"bt709",
"color_primaries" :"bt709",
"chroma_location" :"topleft",
"field_order" :"tt",
"refs":1,
"r_frame_rate" :"25/1",
"avg_frame_rate" :"25/1",
"time_base" :"1/25",
"start_pts":0,
"start_time" :"0.000000",
"duration_ts":448,
"duration" :"17.920000",
"bit_rate" :"50000000",
"disposition" :
"default":0,
"dub":0,
"original":0,
"comment":0,
"lyrics":0,
"karaoke":0,
"forced":0,
"hearing_impaired":0,
"visual_impaired":0,
"clean_effects":0,
"attached_pic":0,
"timed_thumbnails":0
,
"tags" :
"file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
,
"index":1,
"codec_name" :"pcm_s24le",
"codec_long_name" :"PCM signed 24-bit little-endian",
"codec_type" :"audio",
"codec_time_base" :"1/48000",
"codec_tag_string" :"[0][0][0][0]",
"codec_tag" :"0x0000",
"sample_fmt" :"s32",
"sample_rate" :"48000",
"channels":1,
"bits_per_sample":24,
"r_frame_rate" :"0/0",
"avg_frame_rate" :"0/0",
"time_base" :"1/48000",
"start_pts":0,
"start_time" :"0.000000",
"duration_ts":860160,
"duration" :"17.920000",
"bit_rate" :"1152000",
"bits_per_raw_sample" :"24",
"disposition" :
"default":0,
"dub":0,
"original":0,
"comment":0,
"lyrics":0,
"karaoke":0,
"forced":0,
"hearing_impaired":0,
"visual_impaired":0,
"clean_effects":0,
"attached_pic":0,
"timed_thumbnails":0
,
"tags" :
"file_package_umid" :"0x060A2B340101010501010D2313000000968F75C6B5B34D649967EEDD0076B989"
,
"index":2,
"codec_name" :"pcm_s24le",
"codec_long_name" :"PCM signed 24-bit little-endian",
"codec_type" :"audio",
"codec_time_base" :"1/48000",
"codec_tag_string" :"[0][0][0][0]",
"codec_tag" :"0x0000",
"sample_fmt" :"s32",
"sample_rate" :"48000",
"channels":1,
"bits_per_sample":24,
"r_frame_rate" :"0/0",
"avg_frame_rate" :"0/0",
"time_base" :"1/48000",
"start_pts":0,
"start_time" :"0.000000",
"duration_ts":860160,
"duration" :"17.920000",
"bit_rate" :"1152000",
"bits_per_raw_sample" :"24",
"disposition" :
"default":0,
"dub":0,
"original":0,
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