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Sur d’autres sites (3908)

  • How to encode using the FFMpeg in Android (using H263)

    3 juillet 2012, par Kenny910

    I am trying to follow the sample code on encoding in the ffmpeg document and successfully build a application to encode and generate a mp4 file but I face the following problems :

    1) I am using the H263 for encoding but I can only set the width and height of the AVCodecContext to 176x144, for other case (like 720x480 or 640x480) it will return fail.

    2) I can't play the output mp4 file by using the default Android player, isn't it support H263 mp4 file ? p.s. I can play it by using other player

    3) Is there any sample code on encoding other video frame to make a new video (which mean decode the video and encode it back in different quality setting, also i would like to modify the frame content) ?

    Here is my code, thanks !

    JNIEXPORT jint JNICALL Java_com_ffmpeg_encoder_FFEncoder_nativeEncoder(JNIEnv* env, jobject thiz, jstring filename){
    

    
LOGI("nativeEncoder()");
    

    
avcodec_register_all();
    
avcodec_init();
    
av_register_all();
    

    
AVCodec         *codec;
    
AVCodecContext  *codecCtx;
    
int             i;
    
int             out_size;
    
int             size;
    
int             x;
    
int             y;
    
int             output_buffer_size;
    
FILE            *file;
    
AVFrame         *picture;
    
uint8_t         *output_buffer;
    
uint8_t         *picture_buffer;
    

    
/* Manual Variables */
    
int             l;
    
int             fps = 30;
    
int             videoLength = 5;
    

    
/* find the H263 video encoder */
    
codec = avcodec_find_encoder(CODEC_ID_H263);
    
if (!codec) {
    
    LOGI("avcodec_find_encoder() run fail.");
    
}
    

    
codecCtx = avcodec_alloc_context();
    
picture = avcodec_alloc_frame();
    

    
/* put sample parameters */
    
codecCtx->bit_rate = 400000;
    
/* resolution must be a multiple of two */
    
codecCtx->width = 176;
    
codecCtx->height = 144;
    
/* frames per second */
    
codecCtx->time_base = (AVRational){1,fps};
    
codecCtx->pix_fmt = PIX_FMT_YUV420P;
    
codecCtx->codec_id = CODEC_ID_H263;
    
codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
    

    
/* open it */
    
if (avcodec_open(codecCtx, codec) < 0) {
    
    LOGI("avcodec_open() run fail.");
    
}
    

    
const char* mfileName = (*env)->GetStringUTFChars(env, filename, 0);
    

    
file = fopen(mfileName, "wb");
    
if (!file) {
    
    LOGI("fopen() run fail.");
    
}
    

    
(*env)->ReleaseStringUTFChars(env, filename, mfileName);
    

    
/* alloc image and output buffer */
    
output_buffer_size = 100000;
    
output_buffer = malloc(output_buffer_size);
    

    
size = codecCtx->width * codecCtx->height;
    
picture_buffer = malloc((size * 3) / 2); /* size for YUV 420 */
    

    
picture->data[0] = picture_buffer;
    
picture->data[1] = picture->data[0] + size;
    
picture->data[2] = picture->data[1] + size / 4;
    
picture->linesize[0] = codecCtx->width;
    
picture->linesize[1] = codecCtx->width / 2;
    
picture->linesize[2] = codecCtx->width / 2;
    

    
for(l=0;l/encode 1 second of video
    
    for(i=0;i/prepare a dummy image YCbCr
    
        //Y
    
        for(y=0;yheight;y++) {
    
            for(x=0;xwidth;x++) {
    
                picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
    
            }
    
        }
    

    
        //Cb and Cr
    
        for(y=0;yheight/2;y++) {
    
            for(x=0;xwidth/2;x++) {
    
                picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
    
                picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
    
            }
    
        }
    

    
        //encode the image
    
        out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, picture);
    
        fwrite(output_buffer, 1, out_size, file);
    
    }
    

    
    //get the delayed frames
    
    for(; out_size; i++) {
    
        out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, NULL);
    
        fwrite(output_buffer, 1, out_size, file);
    
    }
    
}
    

    
//add sequence end code to have a real mpeg file
    
output_buffer[0] = 0x00;
    
output_buffer[1] = 0x00;
    
output_buffer[2] = 0x01;
    
output_buffer[3] = 0xb7;
    

    
fwrite(output_buffer, 1, 4, file);
    
fclose(file);
    
free(picture_buffer);
    
free(output_buffer);
    
avcodec_close(codecCtx);
    
av_free(codecCtx);
    
av_free(picture);
    

    
LOGI("finish");
    

    
return 0; }

  • How to encode using the FFMpeg in Android (using H263)

    10 mai 2019, par Kenny910

    I am trying to follow the sample code on encoding in the ffmpeg document and successfully build a application to encode and generate a mp4 file but I face the following problems :

    1) I am using the H263 for encoding but I can only set the width and height of the AVCodecContext to 176x144, for other case (like 720x480 or 640x480) it will return fail.

    2) I can’t play the output mp4 file by using the default Android player, isn’t it support H263 mp4 file ? p.s. I can play it by using other player

    3) Is there any sample code on encoding other video frame to make a new video (which mean decode the video and encode it back in different quality setting, also i would like to modify the frame content) ?

    Here is my code, thanks !

    JNIEXPORT jint JNICALL Java_com_ffmpeg_encoder_FFEncoder_nativeEncoder(JNIEnv* env, jobject thiz, jstring filename){
    

    
LOGI("nativeEncoder()");
    

    
avcodec_register_all();
    
avcodec_init();
    
av_register_all();
    

    
AVCodec         *codec;
    
AVCodecContext  *codecCtx;
    
int             i;
    
int             out_size;
    
int             size;
    
int             x;
    
int             y;
    
int             output_buffer_size;
    
FILE            *file;
    
AVFrame         *picture;
    
uint8_t         *output_buffer;
    
uint8_t         *picture_buffer;
    

    
/* Manual Variables */
    
int             l;
    
int             fps = 30;
    
int             videoLength = 5;
    

    
/* find the H263 video encoder */
    
codec = avcodec_find_encoder(CODEC_ID_H263);
    
if (!codec) {
    
    LOGI("avcodec_find_encoder() run fail.");
    
}
    

    
codecCtx = avcodec_alloc_context();
    
picture = avcodec_alloc_frame();
    

    
/* put sample parameters */
    
codecCtx->bit_rate = 400000;
    
/* resolution must be a multiple of two */
    
codecCtx->width = 176;
    
codecCtx->height = 144;
    
/* frames per second */
    
codecCtx->time_base = (AVRational){1,fps};
    
codecCtx->pix_fmt = PIX_FMT_YUV420P;
    
codecCtx->codec_id = CODEC_ID_H263;
    
codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
    

    
/* open it */
    
if (avcodec_open(codecCtx, codec) < 0) {
    
    LOGI("avcodec_open() run fail.");
    
}
    

    
const char* mfileName = (*env)->GetStringUTFChars(env, filename, 0);
    

    
file = fopen(mfileName, "wb");
    
if (!file) {
    
    LOGI("fopen() run fail.");
    
}
    

    
(*env)->ReleaseStringUTFChars(env, filename, mfileName);
    

    
/* alloc image and output buffer */
    
output_buffer_size = 100000;
    
output_buffer = malloc(output_buffer_size);
    

    
size = codecCtx->width * codecCtx->height;
    
picture_buffer = malloc((size * 3) / 2); /* size for YUV 420 */
    

    
picture->data[0] = picture_buffer;
    
picture->data[1] = picture->data[0] + size;
    
picture->data[2] = picture->data[1] + size / 4;
    
picture->linesize[0] = codecCtx->width;
    
picture->linesize[1] = codecCtx->width / 2;
    
picture->linesize[2] = codecCtx->width / 2;
    

    
for(l=0;l/encode 1 second of video
    
    for(i=0;i/prepare a dummy image YCbCr
    
        //Y
    
        for(y=0;yheight;y++) {
    
            for(x=0;xwidth;x++) {
    
                picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
    
            }
    
        }
    

    
        //Cb and Cr
    
        for(y=0;yheight/2;y++) {
    
            for(x=0;xwidth/2;x++) {
    
                picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
    
                picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
    
            }
    
        }
    

    
        //encode the image
    
        out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, picture);
    
        fwrite(output_buffer, 1, out_size, file);
    
    }
    

    
    //get the delayed frames
    
    for(; out_size; i++) {
    
        out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, NULL);
    
        fwrite(output_buffer, 1, out_size, file);
    
    }
    
}
    

    
//add sequence end code to have a real mpeg file
    
output_buffer[0] = 0x00;
    
output_buffer[1] = 0x00;
    
output_buffer[2] = 0x01;
    
output_buffer[3] = 0xb7;
    

    
fwrite(output_buffer, 1, 4, file);
    
fclose(file);
    
free(picture_buffer);
    
free(output_buffer);
    
avcodec_close(codecCtx);
    
av_free(codecCtx);
    
av_free(picture);
    

    
LOGI("finish");
    

    
return 0; }

  • How to pipe ppm data into ffmpeg from blender frameserver with while loop in PowerShell

    14 octobre 2016, par Radium

    Blender 2.6 manual features this little sh script for encoding a video from the Blender frameserver via ffmpeg. It works great on Windows with Cygwin, but only without -hwaccel hardware acceleration flag.

    #!/bin/sh
    
BLENDER=http://localhost:8080
    
OUTPUT=/tmp/output.ogv
    
eval `wget ${BLENDER}/info.txt -O - 2>/dev/null |
    
    while read key val ; do
    
        echo R_$key=$val  
    
    done`
    
i=$R_start
    
{
    
    while [ $i -le $R_end ] ; do
    
       wget ${BLENDER}/images/ppm/$i.ppm -O - 2>/dev/null
    
       i=$(($i+1))
    
    done
    
} | ffmpeg -vcodec ppm -f image2pipe -r $R_rate -i pipe:0 -b 6000k -vcodec libtheora $OUTPUT
    
wget ${BLENDER}/close.txt -O - 2>/dev/null >/dev/null

    I’d like to encode my videos from Blender’s in Windows with -hwaccel dxva2 which works with PowerShell. I’ve begun converting the script to PowerShell but I have run into one last problem. I am having difficulty replicating this part of the script in PowerShell.

    i=$R_start
    
{
    
    while [ $i -le $R_end ] ; do
    
       wget ${BLENDER}/images/ppm/$i.ppm -O - 2>/dev/null
    
       i=$(($i+1))
    
    done
    
} | ffmpeg -vcodec ppm -f image2pipe -r $R_rate -i pipe:0 -b 6000k -vcodec libtheora $OUTPUT

    Below is my conversion to PowerShell.

    echo "gathering data";
    
$blender = "http://localhost:8080";
    
$output = "C:\Users\joel\Desktop\output.mp4";
    
$webobj = wget $blender"/info.txt";
    
$lines = $webobj.Content -split('[\r\n]') | ? {$_};
    
$info = @{};
    
foreach ($line in $lines) {
    
    $lineinfo = $line -split('[\s]') | ? {$_};
    
    $info[$lineinfo[0]] = $lineinfo[1];
    
}
    
echo $info;
    
[int]$end = [convert]::ToInt32($info['end'],10);
    
[int]$i = [convert]::ToInt32($info['start'],10);
    
$video="";
    
( while ($i -le $end) {
    
    $frame = wget $blender"/images/ppm/"$i".ppm" > $null;
    
    echo $frame.Content > $null;
    
    $i++;
    
} ) | ffmpeg -hwaccel dxva2 -vcodec ppm -f image2pipe -r $info['rate'] -i pipe:0 -b 6000k -vcodec libx264 $output;

    This is the piece I’m having trouble with. I’m not quite sure what the proper syntax is to pipe the data into the ffmpeg command in the same way as the bash script above.

    ( while( $i -le $end ) {
    
    $frame = wget $blender"/images/ppm/"$i".ppm" > $null;
    
    echo $frame.Content > $null;
    
    $i++;
    
} ) | ffmpeg -hwaccel dxva2 -vcodec ppm -f image2pipe -r $info['rate'] -i pipe:0 -b 6000k -vcodec libx264 $output;

    Here is the output :

    PS C :\Users\joel\Desktop> .\encode.ps1
gathering data

    Name                           Value
    

    

                               -----
    
rate                           30
    
height                         720
    
ratescale                      1
    
end                            57000
    
width                          1280
    
start                          1
    
while : The term ’while’ is not recognized as the name of a cmdlet, function,
    
script file, or operable program. Check the spelling of the name, or if a path
    
was included, verify that the path is correct and try again.
    
At C :\Users\joel\Desktop\encode.ps1:15 char:3
    
+ ( while ($i -le $end) 
    
+ 
    
    + CategoryInfo : ObjectNotFound : (while:String) [], CommandNotFoundException
    
    + FullyQualifiedErrorId : CommandNotFoundException

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