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.
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| @@ -276,6 +276,25 @@ int main(int argc, char **argv) · 275 unmodified lines | ||
| 276 | 276 | } |
| 277 | 277 | av_packet_unref(packet); |
| 278 | 278 | } |
| 279 | + if (ret == AVERROR_EOF) { | |
| 280 | + /* signal EOF to the filtergraph */ | |
| 281 | + if (av_buffersrc_add_frame_flags(buffersrc_ctx, NULL, 0) < 0) { | |
| 282 | + av_log(NULL, AV_LOG_ERROR, "Error while closing the filtergraph\n"); | |
| 283 | + goto end; | |
| 284 | + } | |
| 285 | + | |
| 286 | + /* pull remaining frames from the filtergraph */ | |
| 287 | + while (1) { | |
| 288 | + ret = av_buffersink_get_frame(buffersink_ctx, filt_frame); | |
| 289 | + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) | |
| 290 | + break; | |
| 291 | + if (ret < 0) | |
| 292 | + goto end; | |
| 293 | + display_frame(filt_frame, buffersink_ctx->inputs[0]->time_base); | |
| 294 | + av_frame_unref(filt_frame); | |
| 295 | + } | |
| 296 | + } | |
| 297 | + | |
| 279 | 298 | end: |
| 280 | 299 | avfilter_graph_free(&filter_graph); |
| 281 | 300 | avcodec_free_context(&dec_ctx); |