[FFmpeg-devel] [PATCH 1/2] examples/decode_filter_audio: Add loop for draining the filtergraph

[Tobias Rapp <t.rapp@noa-archive.com>]

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

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
---
 doc/examples/decode_filter_audio.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/doc/examples/decode_filter_audio.c b/doc/examples/decode_filter_audio.c
index 2046419..196f080 100644
--- a/doc/examples/decode_filter_audio.c
+++ b/doc/examples/decode_filter_audio.c
@@ -279,6 +279,25 @@ 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;
+            print_frame(filt_frame);
+            av_frame_unref(filt_frame);
+        }
+    }
+
 end:
     avfilter_graph_free(&filter_graph);
     avcodec_free_context(&dec_ctx);
-- 
2.7.4

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".