Hi, you should use CODEC_ID_H264, cause libx264 produces h.264 video stream and ffmpeg mpeg4 decoder can not decode h.264 video stream.
Hung, Nguyen Viet On Mar 23, 2012 8:11 PM, "ZHAO Yinxia" <[email protected]> wrote: > Hi huanggh0108, > > I am sure I have no audio frame... While, I use libx264 to encode the > frames, and I am not sure I chose the right CODEC_ID for decoding. > > I use CODEC_ID_MPEG4. CODEC_ID_H264 looks more reasonable, but returns a > "no frame" error. > > 2012/3/23 huanggh0108 <[email protected]> > >> ** >> I guess the data may be audio frame, not video frame. The data should be >> filtered before sending at the server end. >> >> >> 2012-03-23 >> ------------------------------ >> huanggh0108 >> ------------------------------ >> *发件人：* Yinxia >> *发送时间：* 2012-03-23 00:52:01 >> *收件人：* libav-user >> *抄送：* >> *主题：* [Libav-user] Decoding Problem (got_picture always return 0) >> Hi dear all, >> >> I am a newbie to ffmpeg and I would like to decode the bitstream, which is >> encoded using libx264 at the server end and sent to client frame by frame. >> I wrote a function decodeFrame to decode this bitstream frame by frame, >> this function is called in a loop, each time recieves a new frame: >> void decodeFrame( int size, unsigned char *data) >> { >> avpkt.size = size; >> avpkt.data = (uint8_t *)(data); >> /*decode each frame*/ >> len = avcodec_decode_video2(c, picture, &got_picture, avpkt.size); >> if (len < 0) { >> fprintf(stderr, "[avcodec][Err] Error while decoding frame %d\n",frame); >> exit(1); >> } >> if (got_picture) { >> printf("[avcodec] Saving frame %3d\n",frame); >> fflush(stdout); >> _snprintf(buf, sizeof(buf), "/temp/video%d.pgm", frame); // not found >> >> pgmSave(picture->data[0], picture->linesize[0], c->width, c->height, buf); >> frame++; >> } >> } >> I can successfully get the value of len, which is exactly the size of >> frame, however, *the value of *got_picture *is always 0. *Can anyone help >> me with this? >> * >> * >> PS. this is the init function of decoder. >> void initDecoder() >> { >> avcodec_register_all(); >> av_init_packet(&avpkt); >> memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE); >> printf("[avcodec] Frame decoding initializing\n"); >> /*choose correct video decoder*/ >> codec = avcodec_find_decoder(CODEC_ID_MPEG4); >> if ( !codec ) { >> fprintf(stderr, "[avcodec][Err] codec not found!\n"); >> exit(1); >> } >> c = avcodec_alloc_context3(codec); >> picture = avcodec_alloc_frame(); >> if(codec->capabilities&CODEC_CAP_TRUNCATED) >> c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete >> frames */ >> /* open it */ >> if (avcodec_open2(c, codec, NULL) < 0) { >> fprintf(stderr, "[avcodec][Err] could not open codec\n"); >> exit(1); >> } >> frame = 0; >> } >> Thank you very much! >> Yinxia >> -- >> View this message in context: >> http://libav-users.943685.n4.nabble.com/Decoding-Problem-got-picture-always-return-0-tp4496039p4496039.html >> Sent from the libav-users mailing list archive at Nabble.com. >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user >> >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user >> >> > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > >
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