diff --git a/Cargo.lock b/Cargo.lock
index c9ab906ff..5011f7092 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1731,7 +1731,7 @@ dependencies = [
 [[package]]
 name = "h263-rs"
 version = "0.1.0"
-source = "git+https://github.com/ruffle-rs/h263-rs?rev=f0083f5933f173798dd308d1678f06d181a99975#f0083f5933f173798dd308d1678f06d181a99975"
+source = "git+https://github.com/ruffle-rs/h263-rs?rev=78d96c0034c519482c8f81e1042c86fc3684f7b3#78d96c0034c519482c8f81e1042c86fc3684f7b3"
 dependencies = [
  "bitflags",
  "lazy_static",
@@ -1742,7 +1742,7 @@ dependencies = [
 [[package]]
 name = "h263-rs-yuv"
 version = "0.1.0"
-source = "git+https://github.com/ruffle-rs/h263-rs?rev=f0083f5933f173798dd308d1678f06d181a99975#f0083f5933f173798dd308d1678f06d181a99975"
+source = "git+https://github.com/ruffle-rs/h263-rs?rev=78d96c0034c519482c8f81e1042c86fc3684f7b3#78d96c0034c519482c8f81e1042c86fc3684f7b3"
 dependencies = [
  "bytemuck",
  "wide",
@@ -4709,9 +4709,9 @@ dependencies = [
 
 [[package]]
 name = "wide"
-version = "0.7.6"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "feff0a412894d67223777b6cc8d68c0dab06d52d95e9890d5f2d47f10dd9366c"
+checksum = "b689b6c49d6549434bf944e6b0f39238cf63693cb7a147e9d887507fffa3b223"
 dependencies = [
  "bytemuck",
  "safe_arch",
diff --git a/video/software/Cargo.toml b/video/software/Cargo.toml
index eed515c43..9e0893407 100644
--- a/video/software/Cargo.toml
+++ b/video/software/Cargo.toml
@@ -16,8 +16,8 @@ thiserror = "1.0"
 flate2 = "1.0.25"
 log = "0.4"
 
-h263-rs = { git = "https://github.com/ruffle-rs/h263-rs", rev = "f0083f5933f173798dd308d1678f06d181a99975", optional = true }
-h263-rs-yuv = { git = "https://github.com/ruffle-rs/h263-rs", rev = "f0083f5933f173798dd308d1678f06d181a99975", optional = true }
+h263-rs = { git = "https://github.com/ruffle-rs/h263-rs", rev = "78d96c0034c519482c8f81e1042c86fc3684f7b3", optional = true }
+h263-rs-yuv = { git = "https://github.com/ruffle-rs/h263-rs", rev = "78d96c0034c519482c8f81e1042c86fc3684f7b3", optional = true }
 nihav_core = { git = "https://github.com/ruffle-rs/nihav-vp6", rev = "9416fcc9fc8aab8f4681aa9093b42922214abbd3", optional = true }
 nihav_codec_support = { git = "https://github.com/ruffle-rs/nihav-vp6", rev = "9416fcc9fc8aab8f4681aa9093b42922214abbd3", optional = true }
 nihav_duck = { git = "https://github.com/ruffle-rs/nihav-vp6", rev = "9416fcc9fc8aab8f4681aa9093b42922214abbd3", optional = true }
diff --git a/video/software/src/decoder/h263.rs b/video/software/src/decoder/h263.rs
index 6ef49e0c9..938e2fa9e 100644
--- a/video/software/src/decoder/h263.rs
+++ b/video/software/src/decoder/h263.rs
@@ -69,8 +69,9 @@ impl VideoDecoder for H263Decoder {
             .into_width_and_height()
             .ok_or(H263Error::MissingWidthHeight)?;
         let chroma_width = picture.chroma_samples_per_row();
+        debug_assert_eq!(chroma_width, (width as usize + 1) / 2);
         let (y, b, r) = picture.as_yuv();
-        let rgba = yuv420_to_rgba(y, b, r, width.into(), chroma_width);
+        let rgba = yuv420_to_rgba(y, b, r, width.into());
         Ok(DecodedFrame {
             width,
             height,
diff --git a/video/software/src/decoder/vp6.rs b/video/software/src/decoder/vp6.rs
index 97cf01ea5..a94358cb9 100644
--- a/video/software/src/decoder/vp6.rs
+++ b/video/software/src/decoder/vp6.rs
@@ -156,6 +156,8 @@ impl VideoDecoder for Vp6Decoder {
 
         let (mut width, mut height) = frame.get_dimensions(0);
         let (chroma_width, chroma_height) = frame.get_dimensions(1);
+        debug_assert_eq!(chroma_width, (width + 1) / 2);
+        debug_assert_eq!(chroma_height, (height + 1) / 2);
 
         // We assume that there is no padding between rows
         debug_assert!(frame.get_stride(0) == frame.get_dimensions(0).0);
@@ -174,7 +176,6 @@ impl VideoDecoder for Vp6Decoder {
             &yuv[offsets.1..offsets.1 + chroma_width * chroma_height],
             &yuv[offsets.2..offsets.2 + chroma_width * chroma_height],
             width,
-            chroma_width,
         );
 
         // Adding in the alpha component, if present.