設置Webm的工具問題

Question

我一直試圖設置這半天，現在我越來越絕望，請幫助。 我正在關注https://developer.mozilla.org/en-US/docs/Web/HTML/DASH_Adaptive_Streaming_for_HTML_5_Video，但我被困在第3步，因爲我無法設置dash_manifest（來自webm-tools）。錯誤，當我運行cmake路徑我正在/到/ webmtools是：

CMake Error at CMakeLists.txt:24 (add_executable): 
    add_executable cannot create target "webm_info" because another target with 
    the same name already exists. The existing target is an executable created 
    in source directory "/home/relja/Desktop/applicationsAndServices/libwebm". 
    See documentation for policy CMP0002 for more details. 


CMake Error at CMakeLists.txt:31 (target_link_libraries): 
    Attempt to add link library "webm" to target "webm_info" which is not built 
    in this directory. 


-- Configuring incomplete, errors occurred! 
See also "/home/relja/Desktop/applicationsAndServices/webm-tools/CMakeFiles/CMakeOutput.log". 
See also "/home/relja/Desktop/applicationsAndServices/webm-tools/CMakeFiles/CMakeError.log". 

正如我先前提到的我用libwebm對於該方法的步驟2。 我已經嘗試刪除libwebm，爲此我得到了libwebm不存在的響應，因此操作無法執行。我嘗試過使用CMakeLists.txt，但沒有取得任何成果，因爲我不明白這裏的根本原因。文檔不存在（或我找不到），所以我不得不訴諸於此。如果我忘了添加一些內容，請詢問。

編輯1： 我忘了提，我使用Ubuntu 編輯2： 避免了使用unix makefile文件，而不是C進行的問題，做工精細

Answer 1

我花了，而與此擺弄，並想出了工作的CMakeLists.txt：

## Copyright (c) 2015 The WebM project authors. All Rights Reserved. 
## 
## Use of this source code is governed by a BSD-style license 
## that can be found in the LICENSE file in the root of the source 
## tree. An additional intellectual property rights grant can be found 
## in the file PATENTS. All contributing project authors may 
## be found in the AUTHORS file in the root of the source tree. 
cmake_minimum_required(VERSION 2.8) 
project(WEBMTOOLS) 

set(WEBMTOOLS_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}") 
# TODO(tomfinegan): The libwebm source directory must be configurable. 
set(LIBWEBM_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../libwebm") 
# This is where LIBWEBM targets are built. 
set(LIBWEBM_BUILD_DIR "${CMAKE_BINARY_DIR}/libwebm_build") 

# Libwebm section. 
# Add the libwebm CMakeLists.txt and set the binary dir to allow access to 
# libwebm build output. 
add_subdirectory("${LIBWEBM_SRC_DIR}" "${LIBWEBM_BUILD_DIR}") 
include_directories("${LIBWEBM_SRC_DIR}" 
        "${WEBMTOOLS_SRC_DIR}/shared") 

add_executable(dash_manifest 
    "${WEBMTOOLS_SRC_DIR}/shared/indent.cc" 
    "${WEBMTOOLS_SRC_DIR}/shared/webm_file.cc" 
    "${WEBMTOOLS_SRC_DIR}/shared/webm_incremental_reader.cc" 
    "${WEBMTOOLS_SRC_DIR}/webm_dash_manifest/adaptation_set.cc" 
    "${WEBMTOOLS_SRC_DIR}/webm_dash_manifest/dash_model.cc" 
    "${WEBMTOOLS_SRC_DIR}/webm_dash_manifest/period.cc" 
    "${WEBMTOOLS_SRC_DIR}/webm_dash_manifest/representation.cc" 
    "${WEBMTOOLS_SRC_DIR}/webm_dash_manifest/webm_dash_manifest.cc") 

target_link_libraries(dash_manifest LINK_PUBLIC webm) 

爲了編譯webm_dash_manifest：

cd webm_dash_manifest/ 
make 

另請注意，sample_muxer現在稱爲mkvmuxer_sample。