From 6c2a19ab3d04c4718bbebd0b530a3cd6e13d8aa6 Mon Sep 17 00:00:00 2001
From: Asd-g <65298684+Asd-g@users.noreply.github.com>
Date: Sun, 24 Dec 2023 04:14:14 +0200
Subject: [PATCH] AviSynth: allow format="" (#54)

---
 AviSynth/libavsmash_source.cpp | 10 +++++++---
 AviSynth/lwlibav_source.cpp    | 10 +++++++---
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/AviSynth/libavsmash_source.cpp b/AviSynth/libavsmash_source.cpp
index 52b54c9d..5abe5b5d 100644
--- a/AviSynth/libavsmash_source.cpp
+++ b/AviSynth/libavsmash_source.cpp
@@ -530,9 +530,13 @@ AVSValue __cdecl CreateLSMASHVideoSource( AVSValue args, void *user_data, IScrip
     enum AVPixelFormat pixel_format = AV_PIX_FMT_NONE;
     if (args[8].Defined())
     {
-        pixel_format = get_av_output_pixel_format(args[8].AsString(nullptr));
-        if (pixel_format == AV_PIX_FMT_NONE)
-            env->ThrowError("LSMASHVideoSource: wrong format.");
+        const char* pix_fmt = args[8].AsString();
+        if (strcmp(pix_fmt, ""))
+        {
+            pixel_format = get_av_output_pixel_format(pix_fmt);
+            if (pixel_format == AV_PIX_FMT_NONE)
+                env->ThrowError("LSMASHVideoSource: wrong format.");
+        }
     }
     const char *preferred_decoder_names = args[9].AsString( nullptr );
     int         prefer_hw_decoder       = args[10].AsInt( 0 );
diff --git a/AviSynth/lwlibav_source.cpp b/AviSynth/lwlibav_source.cpp
index 1554cec4..915a7ae7 100644
--- a/AviSynth/lwlibav_source.cpp
+++ b/AviSynth/lwlibav_source.cpp
@@ -415,9 +415,13 @@ AVSValue __cdecl CreateLWLibavVideoSource( AVSValue args, void *user_data, IScri
     enum AVPixelFormat pixel_format = AV_PIX_FMT_NONE;
     if (args[12].Defined())
     {
-        pixel_format = get_av_output_pixel_format(args[12].AsString());
-        if (pixel_format == AV_PIX_FMT_NONE)
-            env->ThrowError("LWLibavVideoSource: wrong format.");
+        const char* pix_fmt = args[12].AsString();
+        if (strcmp(pix_fmt, ""))
+        {
+            pixel_format = get_av_output_pixel_format(pix_fmt);
+            if (pixel_format == AV_PIX_FMT_NONE)
+                env->ThrowError("LWLibavVideoSource: wrong format.");
+        }
     }
     const char *preferred_decoder_names = args[13].AsString( nullptr );
     int         prefer_hw_decoder       = args[14].AsInt( 0 );