diff --git a/src/codeccontext.cpp b/src/codeccontext.cpp
index 234c598e..499c9990 100644
--- a/src/codeccontext.cpp
+++ b/src/codeccontext.cpp
@@ -17,14 +17,14 @@ using namespace std;
 namespace av {
 namespace {
 
-std::pair<ssize_t, const error_category*>
+std::pair<int, const error_category*>
 make_error_pair(Errors errc)
 {
-    return make_pair(static_cast<ssize_t>(errc), &avcpp_category());
+    return make_pair(static_cast<int>(errc), &avcpp_category());
 }
 
-std::pair<ssize_t, const error_category*>
-make_error_pair(ssize_t status)
+std::pair<int, const error_category*>
+make_error_pair(int status)
 {
     if (status < 0)
         return make_pair(status, &ffmpeg_category());
@@ -757,7 +757,7 @@ void CodecContext2::open(const Codec &codec, AVDictionary **options, OptionalErr
         throws_if(ec, stat, ffmpeg_category());
 }
 
-std::pair<ssize_t, const error_category *> CodecContext2::decodeCommon(AVFrame *outFrame, const Packet &inPacket, size_t offset, int &frameFinished, int (*decodeProc)(AVCodecContext *, AVFrame *, int *, const AVPacket *)) noexcept
+std::pair<int, const error_category *> CodecContext2::decodeCommon(AVFrame *outFrame, const Packet &inPacket, size_t offset, int &frameFinished, int (*decodeProc)(AVCodecContext *, AVFrame *, int *, const AVPacket *)) noexcept
 {
     if (!isValid())
         return make_error_pair(Errors::CodecInvalid);
@@ -781,7 +781,7 @@ std::pair<ssize_t, const error_category *> CodecContext2::decodeCommon(AVFrame *
     return make_error_pair(decoded);
 }
 
-std::pair<ssize_t, const error_category *> CodecContext2::encodeCommon(Packet &outPacket, const AVFrame *inFrame, int &gotPacket, int (*encodeProc)(AVCodecContext *, AVPacket *, const AVFrame *, int *)) noexcept
+std::pair<int, const error_category *> CodecContext2::encodeCommon(Packet &outPacket, const AVFrame *inFrame, int &gotPacket, int (*encodeProc)(AVCodecContext *, AVPacket *, const AVFrame *, int *)) noexcept
 {
     if (!isValid()) {
         fflog(AV_LOG_ERROR, "Invalid context\n");
diff --git a/src/codeccontext.h b/src/codeccontext.h
index 814ff93b..66cb040d 100644
--- a/src/codeccontext.h
+++ b/src/codeccontext.h
@@ -129,17 +129,17 @@ class CodecContext2 : public FFWrapperPtr<AVCodecContext>, public noncopyable
     void open(const Codec &codec, AVDictionary **options, OptionalErrorCode ec);
 
 
-    std::pair<ssize_t, const std::error_category*>
+    std::pair<int, const std::error_category*>
     decodeCommon(AVFrame *outFrame, const class Packet &inPacket, size_t offset, int &frameFinished,
                  int (*decodeProc)(AVCodecContext*, AVFrame*,int *, const AVPacket *)) noexcept;
 
-    std::pair<ssize_t, const std::error_category*>
+    std::pair<int, const std::error_category*>
     encodeCommon(class Packet &outPacket, const AVFrame *inFrame, int &gotPacket,
                          int (*encodeProc)(AVCodecContext*, AVPacket*,const AVFrame*, int*)) noexcept;
 
 public:
     template<typename T>
-    std::pair<ssize_t, const std::error_category*>
+    std::pair<int, const std::error_category*>
     decodeCommon(T &outFrame,
                  const class Packet &inPacket,
                  size_t offset,
@@ -147,7 +147,7 @@ class CodecContext2 : public FFWrapperPtr<AVCodecContext>, public noncopyable
                  int (*decodeProc)(AVCodecContext *, AVFrame *, int *, const AVPacket *));
 
     template<typename T>
-    std::pair<ssize_t, const std::error_category*>
+    std::pair<int, const std::error_category*>
     encodeCommon(class Packet &outPacket,
                  const T &inFrame,
                  int &gotPacket,
diff --git a/src/formatcontext.cpp b/src/formatcontext.cpp
index 80f4b1b2..623d883d 100644
--- a/src/formatcontext.cpp
+++ b/src/formatcontext.cpp
@@ -932,7 +932,7 @@ void FormatContext::closeCodecContexts()
 #endif
 }
 
-ssize_t FormatContext::checkPbError(ssize_t stat)
+int FormatContext::checkPbError(int stat)
 {
     // WORKAROUND: a lot of format specific writer_packet() functions always return zero code
     // and av_write_frame() in FFMPEG prio 1.0 does not contain follow wrapper
diff --git a/src/formatcontext.h b/src/formatcontext.h
index 3e7c35ed..749dfbec 100644
--- a/src/formatcontext.h
+++ b/src/formatcontext.h
@@ -27,13 +27,13 @@ using AvioInterruptCb = std::function<int()>;
 struct CustomIO
 {
     virtual ~CustomIO() {}
-    virtual ssize_t     write(const uint8_t *data, size_t size) 
+    virtual int     write(const uint8_t *data, size_t size) 
     {
         static_cast<void>(data);
         static_cast<void>(size);
         return -1; 
     }
-    virtual ssize_t     read(uint8_t *data, size_t size)
+    virtual int     read(uint8_t *data, size_t size)
     {
         static_cast<void>(data);
         static_cast<void>(size);
@@ -202,7 +202,7 @@ class FormatContext : public FFWrapperPtr<AVFormatContext>, public noncopyable
     void        resetSocketAccess();
     void        findStreamInfo(AVDictionary **options, size_t optionsCount, OptionalErrorCode ec);
     void        closeCodecContexts();
-    ssize_t     checkPbError(ssize_t stat);
+    int         checkPbError(int stat);
 
     void        openCustomIO(CustomIO *io, size_t internalBufferSize, bool isWritable, OptionalErrorCode ec);
     void        openCustomIOInput(CustomIO *io, size_t internalBufferSize, OptionalErrorCode ec);