Please remove the setting of CODEC_CAP_TRUNCATED
在 Nov 17, 2011，9:59 PM，Shiju Sasi <[email protected]> 写道：
> Hi,
>
> I have created a sample windows application using ffmpeg and x264 and
> attached it's screenshot. In the application, I capture video and encode it
> using x264, then decode it using ffmpeg and render it. My problem is large
> amount of pixellation. I eliminated the possibility of rendering issues and
> concluded that decoded and scaled output became pixellated.
>
> Request your 2 minutes to review my working approach to see if I have missed
> out anything obvious. I have copied only the relevant parts due to formatting
> issues in gmail. If you can review to check if I have missed out any obvious
> methods/settings as part of decoding, it will be really helpful.
>
> FYI, I have allocated pCodecCtx in the below code using
> avcodec_alloc_context3 and I have set only the coded_height, coded_width and
> pix_fmt fields. I also use
> if(pDecoder->capabilities & CODEC_CAP_TRUNCATED)
>
> pCodecCtx->flags|=CODEC_FLAG_TRUNCATED;
>
> In the scale context, I use SWS_POINT flag for maximum quality.
>
>
>
>
> void decode_h264(const uint8_t* in_buf, int in_buf_size, uint8_t** out_buf,
> int* out_buf_size)
> {
> int got_picture = 0;
> AVPacket avpkt;
> av_init_packet(&avpkt);
> while(in_buf_size > 0)
> {
> int len = 0;
> len = av_parser_parse2(pDecoderParserContext,pCodecCtx, &avpkt.data,
> &avpkt.size, in_buf, in_buf_size, 0, 0, 0);
> in_buf += len;
> in_buf_size -= len;
> if(avpkt.size > 0)
> {
> avcodec_decode_video2(pCodecCtx, pFrame,&got_picture,&avpkt);
> if(got_picture > 0)
> {
> sws_scale(decoderConvertCtx, pFrame->data, pFrame->linesize , 0,
> pFrame->height, pOutFrame->data, pOutFrame->linesize);
> }
> *out_buf_size = userpOutFrame->linesize[0];
> *out_buf = pOutFrame->data[0];
> }
> }
>
> }
>
> Thanks in advance,
> Shiju
>
>
> <pixellated.jpg>
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