Fix a segfault if OpenGL was not initialized before calling
write_header().
Signed-off-by: Nicolas George <geo...@nsup.org>
---
libavdevice/opengl_enc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavdevice/opengl_enc.c b/libavdevice/opengl_enc.c
index fa94345a7c..3d60f7d068 100644
--- a/libavdevice/opengl_enc.c
+++ b/libavdevice/opengl_enc.c
@@ -588,6 +588,10 @@ static av_cold int opengl_read_limits(AVFormatContext *h)
version = glGetString(GL_VERSION);
extensions = glGetString(GL_EXTENSIONS);
+ if (!version || !extensions) {
+ av_log(h, AV_LOG_ERROR, "OpenGL not available\n");
+ return AVERROR(ENOSYS);
+ }
av_log(h, AV_LOG_DEBUG, "OpenGL version: %s\n", version);
sscanf(version, "%d.%d", &major, &minor);
--
2.25.0
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