From 6f9a540a61c2d0b438369e621bceac7936cc0ae7 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 25 Sep 2023 12:35:45 +0400
Subject: [PATCH] Fix crash when libvpx decoder is absent.

Fixes #26849.
---
 Telegram/SourceFiles/ffmpeg/ffmpeg_frame_generator.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/ffmpeg/ffmpeg_frame_generator.cpp b/Telegram/SourceFiles/ffmpeg/ffmpeg_frame_generator.cpp
index 54c4cece8..116d998a2 100644
--- a/Telegram/SourceFiles/ffmpeg/ffmpeg_frame_generator.cpp
+++ b/Telegram/SourceFiles/ffmpeg/ffmpeg_frame_generator.cpp
@@ -254,7 +254,9 @@ FrameGenerator::Frame FrameGenerator::Impl::renderNext(
 		QImage storage,
 		QSize size,
 		Qt::AspectRatioMode mode) {
-	if (!_current.frame) {
+	if (!_codec) {
+		return {};
+	} else if (!_current.frame) {
 		readNextFrame();
 	}
 	std::swap(_current, _next);
@@ -266,6 +268,9 @@ FrameGenerator::Frame FrameGenerator::Impl::renderNext(
 }
 
 void FrameGenerator::Impl::jumpToStart() {
+	if (!_codec) {
+		return;
+	}
 	auto result = 0;
 	if ((result = avformat_seek_file(_format.get(), _streamId, std::numeric_limits<int64_t>::min(), 0, std::numeric_limits<int64_t>::max(), 0)) < 0) {
 		if ((result = av_seek_frame(_format.get(), _streamId, 0, AVSEEK_FLAG_BYTE)) < 0) {