在我的 android 应用程序中，我分别下载 Facebook 视频和音频并将其合并到一个输出文件中。原因是 Facebook 视频 URL 没有声音，而音频 URL 是独立的。我曾尝试使用此mp4Parser来合并音频和视频，它在大多数设备中运行良好，但在从设备文件播放时在 Redmi/MI 设备中出现问题。
我遵循的步骤
- 下载 mp4 格式的无声视频。
- 下载 m4a 格式的音频。
- 合并这两个文件并创建一个 mp4 格式的输出文件。
- 合并完成后删除无声视频和临时音频。
下面是我的代码
依赖项
implementation 'com.iceteck.silicompressorr:silicompressor:2.2.4'
implementation('com.googlecode.mp4parser:isoparser:1.0.6') {
exclude group: 'org.aspectj', module: 'aspectjrt'
}
合并代码
private fun mergeAudioAndVideo(
id: Int,
model: DatabaseDownloadItem?,
file: File?,
activityInstance: LocaleAwareCompatActivity?
) {
val mergingDetail = sharedPreferencesManager.getItemInMergingList(id)
if (mergingDetail != null) {
val timeInMillis = System.currentTimeMillis()
var list: ArrayList<DatabaseDownloadItem>? = sharedViewmodel.pendingMerge.value
if (list == null) {
list = arrayListOf()
}
list.add(model!!)
sharedViewmodel.pendingMerge.postValue(list)
sharedViewmodel.pendingMerge.value?.add(model!!)
CoroutineScope(Dispatchers.Main).launch {
var mergePendingItems: ArrayList<Int>? =
tinyDB?.getMergeList(AppConstants.MERGE_PENDING_DOWNLOADS)
if (mergePendingItems == null) {
mergePendingItems = arrayListOf()
}
if (!mergePendingItems.contains(model.id)) {
mergePendingItems.add(model.id)
}
tinyDB?.putMergeList(AppConstants.MERGE_PENDING_DOWNLOADS, mergePendingItems)
adapter.notifyDataSetChanged()
CoroutineScope(Dispatchers.IO + exceptionHandler).async {
val audiopath = mergingDetail.audioPath
val videopath = mergingDetail.videoPath
/*
following comment is kept for reference
val audiopath = "/storage/emulated/0/VideoDownloader/tempAudio_1643715180488.m4a"
val videopath = "/storage/emulated/0/VideoDownloader/1643715180480.mp4"*/
val output: String
val outputName = "output_${mergingDetail.originalFileName}"
mergingDetail.outputFileName = outputName
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
val file = File(
getDownloaderFolderFromDownloads(),
"$outputName.mp4"
)
output = file.absolutePath
mergingDetail.outputFile = file
} else {
val file = File(
Environment.getExternalStorageDirectory()
.toString() + "/VideoDownloader/",
"$outputName.mp4"
)
output = file.absolutePath
mergingDetail.outputFile = file
}
var videoOutput: Movie? = null
var audioOutput: Movie? = null
kotlin.runCatching {
videoOutput = MovieCreator.build(videopath)
audioOutput = MovieCreator.build(audiopath)
}
val finalTrack: MutableList<Track> = ArrayList()
for (track in videoOutput?.tracks!!) {
if (track.handler.equals("vide")) finalTrack.add(track)
}
for (track in audioOutput?.tracks!!) {
if (track.handler.equals("soun")) finalTrack.add(track)
}
videoOutput?.tracks = finalTrack
val mp4file: Container = DefaultMp4Builder().build(videoOutput)
kotlin.runCatching {
val fc: FileChannel = FileOutputStream(File(output)).getChannel()
mp4file.writeContainer(fc)
fc.close()
}.onFailure { error ->
val abc = error
}.onSuccess { someFuncReturnValue ->
val abc = "dss"
}
}.await()
Toast.makeText(activityInstance, "Audio Video Merging Done", Toast.LENGTH_SHORT)
.show()
mergingDetail.isMergingDone = true
sharedPreferencesManager.updateItemInMergingList(id, mergingDetail)
executeDownloadCompletion(model, file, activityInstance)
deleteTempAudioFile(File(mergingDetail.audioPath!!), activityInstance)
deleteOldMutedVideo(File(mergingDetail.videoPath!!), activityInstance)
renameOutputFileWithDBName(mergingDetail, activityInstance)
var list: ArrayList<DatabaseDownloadItem>? = sharedViewmodel.pendingMerge.value
if (list != null && list!!.size > 0) {
list!!.remove(model!!)
sharedViewmodel.pendingMerge.postValue(list)
sharedViewmodel.pendingMerge.value?.add(model!!)
}
notificationWork(model, file, activityInstance)
sharedPreferencesManager.deleteItemInMergingList(id)
}
}
}
这在大多数设备中都可以正常工作，但在 MI 设备（即Redmi S2，MUI 版本 MUI Global 12.0.2）中，我在播放已损坏且无法播放的输出文件时遇到问题。出现的错误只是标题未知。
请注意，我也尝试了以下依赖项组合，但这会在输出文件中产生滞后，因此删除了这两个。
implementation 'org.mp4parser:isoparser:1.9.41'
implementation 'org.mp4parser:muxer:1.9.41
有人可以建议正确的 usgae 和依赖版本的mp4parser用于合并音频文件和视频文件。
任何帮助将不胜感激。
谢谢