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examples/decode_filter_video: Add loop for draining the filtergraph

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Depending on the filters used, the filtergraph may produce trailing data
after feeding it the last input frame. Update the example to include the
necessary loop for draining the filtergraph.

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
This commit is contained in:
Tobias Rapp 2024-03-27 11:44:45 +01:00
parent 55ce666062
commit 02eb2fc577
1 changed files with 19 additions and 0 deletions
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19
doc/examples/decode_filter_video.c
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@ -276,6 +276,25 @@ int main(int argc, char **argv)
}
av_packet_unref(packet);
}
if (ret == AVERROR_EOF) {
/* signal EOF to the filtergraph */
if (av_buffersrc_add_frame_flags(buffersrc_ctx, NULL, 0) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error while closing the filtergraph\n");
goto end;
}
/* pull remaining frames from the filtergraph */
while (1) {
ret = av_buffersink_get_frame(buffersink_ctx, filt_frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
break;
if (ret < 0)
goto end;
display_frame(filt_frame, buffersink_ctx->inputs[0]->time_base);
av_frame_unref(filt_frame);
}
}
end:
avfilter_graph_free(&filter_graph);
avcodec_free_context(&dec_ctx);