使用ffmpeg和H264编解码器创建的视频不会在android上播放：播放器说它不是一个divx文件 [英] video created using ffmpeg and H264 codec does not play on android :player says it is not a divx file
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问题描述
我已经使用ffmpeg和H264编解码器在C中创建了一个视频。
我可以在Android设备上使用第三方播放器（V播放器）运行视频。
但本地播放器不播放视频。它表示该文件不是Divx文件。以下
是我用来从图像创建视频的代码：
I have created a video from images using ffmpeg and H264 codec in C. I can run the video using a 3rd party player (V player ) on android devices. But the native player does not play the video. IT says that the file is not a Divx file. below is the code that i have used to create the video from images:
JNIEXPORT void Java_com_canvasm_mediclinic_VideoGenerator_generate(JNIEnv *pEnv, jobject pObj,jobjectArray stringArray,int famerate,int width,int height,jstring videoFilename)
{
AVCodec *codec;
AVCodecContext *c= NULL;
//int framesnum=5;
int i,looper, out_size, size, x, y,j;
int ret,pts,got_pkt_ptr;
int imagecount= (*pEnv)->GetArrayLength(pEnv, stringArray);
int retval=-10;
uint8_t endcode[]={0,0,1,0xb7};
AVPacket outpacket;
FILE *f;
AVFrame *picture,*encoded_avframe;
jbyte *raw_record;
char logdatadata[100];
int returnvalue = -1,numBytes =-1;
const char *gVideoFileName = (char *)(*pEnv)->GetStringUTFChars(pEnv, videoFilename, NULL);
/* find the mpeg1 video encoder */
codec = avcodec_find_encoder_by_name("libx264");
if (!codec) {
__android_log_write(ANDROID_LOG_INFO, "record","codec not found");
exit(1);
}
c= avcodec_alloc_context();
c->bit_rate = 500000;
c->width = width;
c->height = height;
c->time_base= (AVRational){1,famerate};
c->gop_size = 12; // emit one intra frame every ten frames
c->max_b_frames=1;
c->pix_fmt = PIX_FMT_YUV420P;
c->codec_type = AVMEDIA_TYPE_VIDEO;
c->codec_id = codec->id;
c->max_b_frames = 0;
c->me_range = 16;
c->max_qdiff = 4;
c->qmin = 10;
c->qmax = 26;
c->qcompress = 0.6;
c->trellis=0;
c->level = 30;
c->refs = 5;
c->coder_type = 0;
c->scenechange_threshold = 0;
//new
c->flags|=CODEC_FLAG_LOOP_FILTER;//new
c->scenechange_threshold = 40; //new
c-> rc_buffer_size = 0;
c->gop_size=250; //new
c->max_b_frames=1;//new
c->me_method=7;
c->me_cmp|= 1;
c->me_subpel_quality = 6;
c->qmax=51;
c->keyint_min=25;
av_opt_set(c->priv_data,"subq","6",0);
av_opt_set(c->priv_data,"crf","20.0",0);
av_opt_set(c->priv_data,"weighted_p_pred","0",0);
av_opt_set(c->priv_data,"profile","baseline",AV_OPT_SEARCH_CHILDREN);
av_opt_set(c->priv_data,"preset","medium",0);
av_opt_set(c->priv_data,"tune","zerolatency",0);
av_opt_set(c->priv_data,"x264opts","rc-lookahead=0",0);
/* open it */
retval = avcodec_open(c, codec);
if ( retval < 0)
{
__android_log_write(ANDROID_LOG_INFO, "record","could not open codec");
exit(1);
}
f = fopen(gVideoFileName, "ab");
if (!f) {
__android_log_write(ANDROID_LOG_INFO, "record","could not open video file");
exit(1);
}
pts = 0;
for(i=0;i<=imagecount;i++) {
jboolean isCp;
int progress = 0;
float temp;
jstring string;
if(i==imagecount)
string = (jstring) (*pEnv)->GetObjectArrayElement(pEnv, stringArray,
imagecount-1);
else
string = (jstring) (*pEnv)->GetObjectArrayElement(pEnv, stringArray, i);
const char *rawString = (*pEnv)->GetStringUTFChars(pEnv, string, &isCp);
picture = OpenImage(rawString,width,height,i);
av_init_packet(&outpacket);
fflush(stdout);
{
picture->pts=i ;//c->frame_number;
do{
out_size = avcodec_encode_video2(c, &outpacket,
picture,&got_pkt_ptr);
}while(!got_pkt_ptr);
}
returnvalue = fwrite(outpacket.data, 1, outpacket.size, f);
av_free_packet(&outpacket);
}
/* get the delayed frames */
for(got_pkt_ptr =1; got_pkt_ptr; i++) {
fflush(stdout);
avcodec_encode_video2(c, &outpacket, NULL,&got_pkt_ptr);
if(got_pkt_ptr)
{
fwrite(outpacket.data, 1, outpacket.size, f);
av_free_packet(&outpacket);
}
}
fwrite(endcode,1,sizeof(endcode),f);
fclose(f);
avcodec_close(c);
av_free(c);
}
AVFrame* OpenImage(const char* imageFileName,int w,int h,int index)
{
AVFrame *pFrame;
AVCodec *pCodec ;
AVFormatContext *pFormatCtx = NULL;
AVCodecContext *pCodecCtx;
uint8_t *buffer;
int frameFinished,framesNumber = 0,retval = -1,numBytes=0;
AVPacket packet;
char logdatadata[100];
int result = -1;
result=avformat_open_input(&pFormatCtx,imageFileName,NULL,NULL);
if(result!=0)
{
__android_log_write(ANDROID_LOG_INFO, "record",
"Can't open image file ");
return NULL;
}
pCodecCtx = pFormatCtx->streams[0]->codec;
pCodecCtx->width = w;
pCodecCtx->height = h;
pCodecCtx->pix_fmt = PIX_FMT_YUV420P;
// Find the decoder for the video stream
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (!pCodec)
{
__android_log_write(ANDROID_LOG_INFO, "record",
"Can't open image file ");
return NULL;
}
pFrame = avcodec_alloc_frame();
numBytes = avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
retval = avpicture_fill((AVPicture *) pFrame, buffer, PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx-
>height);
// Open codec
if(avcodec_open(pCodecCtx, pCodec)<0)
{
__android_log_write(ANDROID_LOG_INFO, "record","Could not open codec");
return NULL;
}
if (!pFrame)
{
__android_log_write(ANDROID_LOG_INFO, "record","Can't allocate memory for AVFrame\n");
return NULL;
}
int readval = -5;
while (readval = av_read_frame(pFormatCtx, &packet) >= 0)
{
if(packet.stream_index != 0)
continue;
int ret = avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
if (ret > 0)
{
__android_log_write(ANDROID_LOG_INFO, "record","Frame is decoded\n");
pFrame->quality = 4;
av_free_packet(&packet);
av_close_input_file(pFormatCtx);
return pFrame;
}
else
{
__android_log_write(ANDROID_LOG_INFO, "record","error while decoding frame \n");
}
}
}
上面的代码生成一个视频可以使用像VLC这样的第三方播放器来运行。
我只是想知道我在Android上的视频播放失败什么
我如何删除不是divx文件错误。
The abovve code produces a video that can be run using a 3rd party player like VLC. I just want to know what am i missing to get the video playing on android How can i remove the "Not a divx file" error.
我已经检查了下面给出的一些论坛链接，但没有使用
link1
link2
I have checked some of the forums links given below but of no use link1 link2
提前感谢。
推荐答案
解决方案。
我通过使用ff-mpeg UNIX可执行文件并移动到命令行来解决这个问题。步骤如下：
Though i should post the solution. I solved this by using a ff-mpeg UNIX executable file and moving to command line.The steps are as below:
1）我能够创建一个8 MB大小的ff-mpeg放在我的资产文件夹中。
1) I was able to create a ff-mpeg of 8 mb size and placed in in my assets folder.
2）当我的应用程序启动时，我将其复制到SD卡上。
2) When my application is launched i copy the file on SD card.
3）然后使用以下代码从图像生成视频
3) Then used the following code to generate the video from images
changeExeMode(SYSTEM_BIN_CHMOD +" 777 "+ APP_DATA_PATH+FFMPEG_EXE);// this is a function defined ahead
String[] ffmpegCommand = new String[] {APP_DATA_PATH+FFMPEG_EXE,
"-f","image2",
"-r",""+frameVisibleTime,
"-i",Environment.getExternalStorageDirectory().toString() + Constants.logoImageDir + "/"+"%d.jpg",path};
Process exeffmpeg = Runtime.getRuntime().exec(ffmpegCommand);
void changeExeMode(String exeName) throws IOException, InterruptedException{
Process chm =Runtime.getRuntime().exec(exeName);
chm.waitFor();
int exitCode = chm.exitValue();
if(exitCode == 0) {
}
else {
printFailureReason(chm);
}
}
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