Similar to what is done for muxing, may be useful for debugging.
---
 fftools/ffmpeg_demux.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 040213b392..29cff4b471 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -256,6 +256,12 @@ static void *input_thread(void *arg)
                 /* fallthrough to the error path */
             }
 
+            if (ret == AVERROR_EOF)
+                av_log(NULL, AV_LOG_VERBOSE, "EOF in input file %d\n", 
f->index);
+            else
+                av_log(NULL, AV_LOG_ERROR, "Error demuxing input file %d: 
%s\n",
+                       f->index, av_err2str(ret));
+
             break;
         }
 
@@ -317,6 +323,8 @@ finish:
 
     av_packet_free(&pkt);
 
+    av_log(NULL, AV_LOG_VERBOSE, "Terminating demuxer thread %d\n", f->index);
+
     return NULL;
 }
 
-- 
2.35.1

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