1.16: Decklinkvideosrc mode=AUTO results in nvh264enc segfault

[jpoet]

If I specify the input mode for decklinkvideosrc then a nvh264enc pipeline works perfectly.  However, if I specify mode=AUTO, then nvh264enc appears to segfault.  Both avenc_mpeg2video and x264enc work fine, so it appears to just be a nvh264enc problem.

gst-launch-1.0 -v decklinkvideosrc device-number=0 mode=0 ! queue ! autovideoconvert ! queue ! nvh264enc ! h264parse ! queue ! mpegtsmux name=mux ! queue ! filesink location=video.ts   decklinkaudiosrc device-number=0 ! queue ! audioconvert ! queue ! avenc_ac3 bitrate=480000 ! ac3parse ! queue ! mux.

0:00:00.499837686 15389      0x16b30a0 WARN                   nvenc gstnvbaseenc.c:1259:gst_nv_base_enc_set_format:<nvh264enc0> error: Failed to init encoder: 8
0:00:00.499949098 15389      0x16b30a0 WARN            videoencoder gstvideoencoder.c:685:gst_video_encoder_setcaps:<nvh264enc0> rejected caps video/x-raw, width=(int)720, height=(int)486, pixel-aspect-ratio=(fraction)10/11, interlace-mode=(string)interleaved, framerate=(fraction)30000/1001, field-order=(string)bottom-field-first, format=(string)I420
Caught SIGSEGV
#0  0x00007f5033326e19 in syscall () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f5033ca687c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f50343b36e4 in gst_object_get_parent (object=0x1636960)
#3  0x00007f50343b3d44 in gst_object_get_path_string (object=0x1636960)
#4  0x0000000000403ff3 in print_error_message (msg=msg@entry=0x1c99f30)
#5  0x0000000000405180 in event_loop (pipeline=0x16b4100,
#6  0x000000000040391d in main (argc=41, argv=0x7ffc7959fd98)

In this example, the actual input mode is 12 (1080i5994) but nvh264enc seg faults before decklinkvideosrc has a chance to properly detect that.

I have tried adding parameters such as drop-no-signal-frames and skip-first-time to decklinkvideosrc, but they do not help.

To see if the nvh264enc cannot handle 720x486, I tried:

diff --git a/sys/decklink/gstdecklink.cpp b/sys/decklink/gstdecklink.cpp
index a366f3c..503a4e4 100644
--- a/sys/decklink/gstdecklink.cpp
+++ b/sys/decklink/gstdecklink.cpp
@@ -256,7 +256,8 @@ gst_decklink_audio_channels_get_type (void)
 #define UHD 1, 1, true, "bt2020", TRUE
 
 static const GstDecklinkMode modes[] = {
-  {bmdModeNTSC, 720, 486, 30000, 1001, true, NTSC},     // default is ntsc
+//  {bmdModeNTSC, 720, 486, 30000, 1001, true, NTSC},     // default is ntsc
+  {bmdModeHD720p60, 1280, 720, 60, 1, false, HD},
 
   {bmdModeNTSC, 720, 486, 30000, 1001, true, NTSC},
   {bmdModeNTSC2398, 720, 486, 24000, 1001, true, NTSC},
diff --git a/sys/nvenc/gstnvbaseenc.c b/sys/nvenc/gstnvbaseenc.c
index 42fe7ac..f0c207a 100644
--- a/sys/nvenc/gstnvbaseenc.c
+++ b/sys/nvenc/gstnvbaseenc.c
@@ -1158,8 +1158,8 @@ gst_nv_base_enc_set_format (GstVideoEncoder * enc, GstVide
     /* this sets the required buffer size and the maximum allowed size on
      * subsequent reconfigures */
     /* FIXME: propertise this */
-    params->maxEncodeWidth = GST_VIDEO_INFO_WIDTH (info);
-    params->maxEncodeHeight = GST_VIDEO_INFO_HEIGHT (info);
+    params->maxEncodeWidth = 3840;
+    params->maxEncodeHeight = 2160;
     gst_nv_base_enc_set_max_encode_size (nvenc, params->maxEncodeWidth,
         params->maxEncodeHeight);
   } else {

But it still segfaults, just in a different place...

I will spend more time trying to figure this out, but I was hoping someone with more knowledge of those components might offer up a solution?

Thanks,

John

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