[Libva] Problem with HWDecode examples

[Varun Dua]

On Thu, Sep 16, 2010 at 10:33 AM, Varun Dua <varundua007 at gmail.com> wrote:

> Hi All
>
>
> I am using the hwdecode examples, they are building and running fine.
>
> I changed the file ffmpeg_video.c to make it decode a video. Below is the
> changed function that I am posting. The commented out portion is the
> original code. I changed that to make it work for decoding a video but it is
> giving a lot of artifacts.
>
> Please tell me what needs to done. I am not changing the surface_id or the
> context_id anywhere.
>
> ***********************************************
> ***********************************************
> int decode(void)
> {
>     AVProbeData pd;
>     ByteIOContext ioctx;
>     AVInputFormat *format = NULL;
>     AVFormatContext *ic = NULL;
>     AVCodec *codec;
>     AVCodecContext *avctx = NULL;
>     AVPacket packet;
>     AVStream *video_stream;
>     int i, got_picture, error = -1;
>
>     const uint8_t *video_data;
>     unsigned int video_data_size;
>
>     av_register_all();
>     av_init_packet(&packet);
>
>    /*codec_get_video_data(&video_data, &video_data_size);
>     pd.filename = "";
>     pd.buf      = (uint8_t *)video_data;
>     pd.buf_size = MIN(video_data_size, 32*1024);
>     if (FORCE_VIDEO_FORMAT)
>         format = av_find_input_format(FORCE_VIDEO_FORMAT);
>     if (format == NULL && (format = av_probe_input_format(&pd, 1)) == NULL)
>         goto end;
>     format->flags |= AVFMT_NOFILE;
>
>     if (init_put_byte(&ioctx, (uint8_t *)video_data, video_data_size, 0,
> NULL, NULL, NULL, NULL) < 0)
>         goto end;
>
>     if (av_open_input_stream(&ic, &ioctx, "", format, NULL) < 0)
>         goto end;
> */
>     av_open_input_file(&ic,"movies/high.mp4",NULL,0,NULL);
>     if (av_find_stream_info(ic) < 0)
>         goto end;
>     dump_format(ic, 0, "", 0);
>
>     video_stream = NULL;
>     for (i = 0; i < ic->nb_streams; i++) {
>         if (ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO &&
> !video_stream)
>             video_stream = ic->streams[i];
>         else
>             ic->streams[i]->discard = AVDISCARD_ALL;
>     }
>     if (video_stream == NULL)
>         goto end;
>     avctx = video_stream->codec;
>     if (ffmpeg_init_context(avctx) < 0)
>         goto end;
>
>     if ((codec = avcodec_find_decoder(avctx->codec_id)) == NULL)
>         goto end;
>     if (avcodec_open(avctx, codec) < 0)
>         goto end;
>
>     got_picture = 0;
>     while (av_read_frame(ic, &packet) == 0) {
>         if (packet.stream_index != video_stream->index)
>             continue;
>         if ((got_picture = ffmpeg_decode(avctx, packet.data, packet.size))
> < 0)
>             goto end;
>         /* read only one frame */
>         if (got_picture) {
>             error = 0;
>         display();
>             //break;
>         }
>     //av_free_packet()
>     }
>     /*if (!got_picture) {
>         if ((got_picture = ffmpeg_decode(avctx, NULL, 0)) < 0)
>             goto end;
>         error = 0;
>     }*/
>
> end:
>     av_free_packet(&packet);
>     if (avctx)
>         avcodec_close(avctx);
>     if (ic)
>         av_close_input_stream(ic);
>     return error;
> }
> ************************************************
> ************************************************
>
> Thanks for your help
> Regards
> Varun Dua
> Integ. M.Tech in Mathematics and Computing
> Mathematics Department
> IIT Delhi
>
>
>
Hi All

I figure that the problem is when there is motion in the frame. For static
images the code works fine, but when I do the same for a video it gives me
artifacts at the frames which have some motion in them. Please tell me where
I might be wrong.

Thanks
Varun Dua
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