diff --git a/entry/src/main/cpp/capbilities/VideoEncoder.cpp b/entry/src/main/cpp/capbilities/VideoEncoder.cpp
index f06ea93bdb29b53630a9f9f0f980fd3547f53ca6..346ee25ddeccd941ca32ddfb19d5d1221a8792a0 100644
--- a/entry/src/main/cpp/capbilities/VideoEncoder.cpp
+++ b/entry/src/main/cpp/capbilities/VideoEncoder.cpp
@@ -147,7 +147,7 @@ int32_t VideoEncoder::Configure(const SampleInfo &sampleInfo) {
 }
 // [End config_encoder]
 
-// [End push_input_buffer]
+// [Start push_input_buffer]
 int32_t VideoEncoder::PushInputBuffer(CodecBufferInfo &info) {
     CHECK_AND_RETURN_RET_LOG(encoder_ != nullptr, AVCODEC_SAMPLE_ERR_ERROR, "Decoder is null");
     int32_t ret = OH_VideoEncoder_PushInputBuffer(encoder_, info.bufferIndex);
diff --git a/entry/src/main/cpp/common/SampleCallback.cpp b/entry/src/main/cpp/common/SampleCallback.cpp
index 99a46e1be0ec4db857e44aaa0b5a45ebd00c8539..911cc94234219c14db7510f401e1c59ad058f9c8 100644
--- a/entry/src/main/cpp/common/SampleCallback.cpp
+++ b/entry/src/main/cpp/common/SampleCallback.cpp
@@ -62,7 +62,6 @@ void SampleCallback::OnNewOutputBuffer(OH_AVCodec *codec, uint32_t index, OH_AVB
     codecUserData->outputBufferInfoQueue.emplace(index, buffer);
     codecUserData->outputCond.notify_all();
 }
-// [End new_output_buffer]
 
 void SampleCallback::EncOnNeedInputBuffer(OH_AVCodec *codec, uint32_t index, OH_AVBuffer *buffer, void *userData) {
     if (userData == nullptr) {
@@ -82,6 +81,7 @@ void SampleCallback::EncOnNeedInputBuffer(OH_AVCodec *codec, uint32_t index, OH_
     codecUserData->inputBufferInfoQueue.emplace(index, buffer);
     codecUserData->inputCond.notify_all();
 }
+// [End new_output_buffer]
 
 void SampleCallback::EncOnNewOutputBuffer(OH_AVCodec *codec, uint32_t index, OH_AVBuffer *buffer, void *userData) {
     if (userData == nullptr) {
diff --git a/entry/src/main/cpp/sample/transcoding/Transcoding.cpp b/entry/src/main/cpp/sample/transcoding/Transcoding.cpp
index 5111594ad87f8a95057591760bd7ce57db89047a..26e4a86a2beff784af38e11d853f642bd60565de 100644
--- a/entry/src/main/cpp/sample/transcoding/Transcoding.cpp
+++ b/entry/src/main/cpp/sample/transcoding/Transcoding.cpp
@@ -30,6 +30,7 @@ constexpr int8_t YUV420_SAMPLE_RATIO = 2;
 
 Transcoding::~Transcoding() { Transcoding::StartRelease(); }
 
+// [Start create_decoder]
 int32_t Transcoding::CreateVideoDecoder() {
     AVCODEC_SAMPLE_LOGW("video mime:%{public}s", sampleInfo_.videoCodecMime.c_str());
     int32_t ret = videoDecoder_->Create(sampleInfo_.videoCodecMime);
@@ -42,6 +43,7 @@ int32_t Transcoding::CreateVideoDecoder() {
     }
     return AVCODEC_SAMPLE_ERR_OK;
 }
+// [End create_decoder]
 
 int32_t Transcoding::Init(SampleInfo &sampleInfo) {
     std::unique_lock<std::mutex> lock(mutex_);
@@ -171,7 +173,7 @@ int32_t Transcoding::Start() {
     doneCond_.notify_all();
     return AVCODEC_SAMPLE_ERR_OK;
 }
-// [Start end_transcoding]
+// [End start_transcoding]
 
 void Transcoding::Stop() {
     StartRelease();