借助以下库，我使用ffmpeg实现了IP摄像机流传输：https://github.com/kolyvan/kxmovie另外，我正在记录即将来临的IPCamera流，并且使用ffmpeg进行了同样的操作。
现在，一旦在项目if (avformat_find_stream_info(formatCtx, NULL) < 0)中将R5ProStreaming.framework添加到项目中并在实际设备中运行应用程序，我将面临一个问题。
然后，当我删除该框架并将其移至废纸and并再次运行时，一切正常。
- (kxMovieError) openInput: (NSString *) path
{
AVFormatContext *formatCtx = NULL;
if (_interruptCallback) {
formatCtx = avformat_alloc_context();
if (!formatCtx)
return kxMovieErrorOpenFile;
AVIOInterruptCB cb = {interrupt_callback, (__bridge void *)(self)};
formatCtx->interrupt_callback = cb;
}
AVDictionary *opts = 0;
//
av_dict_set(&opts, "rtsp_transport", "tcp", 0);
if (avformat_open_input(&formatCtx, [path cStringUsingEncoding: NSUTF8StringEncoding], NULL, &opts) < 0) {
av_log(NULL, AV_LOG_ERROR, "Couldn't open file\n");
return kxMovieErrorStreamInfoNotFound;
}
if (avformat_open_input(&formatCtx, [path cStringUsingEncoding: NSUTF8StringEncoding], NULL, NULL) < 0) {
if (formatCtx)
avformat_free_context(formatCtx);
return kxMovieErrorOpenFile;
}
//-----APP IS GETTING CRASHED HERE AND GIVING EXC_BAD_ACCESS---//
if (avformat_find_stream_info(formatCtx, NULL) < 0)
{
avformat_close_input(&formatCtx);
return kxMovieErrorStreamInfoNotFound;
}
//
av_dump_format(formatCtx, 0, [path.lastPathComponent cStringUsingEncoding: NSUTF8StringEncoding], false);
_formatCtx = formatCtx;
inputFormatCtx = _formatCtx;
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"newdemo" ofType:@".mov"];
if (filePath)
{
NSLog(@"%s - %d # File found", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # File NOT found", __PRETTY_FUNCTION__, __LINE__);
}
/*
* av_find_input_format(const char *short_name)
*
* Find AVInputFormat based on the short name of the input format.
*/
AVInputFormat *inputFormat = av_find_input_format([@"mpeg" UTF8String]);
if (inputFormat)
{
NSLog(@"%s - %d # inputFormat identifed", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # inputFormat NOT identifed", __PRETTY_FUNCTION__, __LINE__) ;
}
const char *utf8FilePath = [filePath UTF8String];
NSLog(@"%s - %d # utf8FilePath = %s", __PRETTY_FUNCTION__, __LINE__, utf8FilePath);
/*
* avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
*
* Open an input stream and read the header. The codecs are not opened.
*/
int openInputValue =0;
NSLog(@"%s - %d # openInputValue = %d", __PRETTY_FUNCTION__, __LINE__, openInputValue);
if (openInputValue == 0)
{
NSLog(@"%s - %d # Can open the file", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Cannot open the file", __PRETTY_FUNCTION__, __LINE__);
avformat_close_input(&inputFormatCtx);
}
/*
* Read packets of a media file to get stream information.
*
* avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
*/
// int streamInfoValue = avformat_find_stream_info(inputFormatCtx, NULL);
// NSLog(@"%s - %d # streamInfoValue = %d", __PRETTY_FUNCTION__, __LINE__, streamInfoValue);
//
// if (streamInfoValue < 0)
// {
// NSLog(@"%s - %d # streamInfoValue Error", __PRETTY_FUNCTION__, __LINE__);
// avformat_close_input(&inputFormatCtx);
// }
/*
* nb_streams : Number of Audio and Video streams of the input file
*/
NSUInteger inputStreamCount = inputFormatCtx->nb_streams;
NSLog(@"%s - %d # inputStreamCount = %lu", __PRETTY_FUNCTION__, __LINE__, (unsigned long)inputStreamCount);
for(unsigned int i = 0; i<inputStreamCount; i++)
{
if(inputFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
NSLog(@"%s - %d # Found Video Stream", __PRETTY_FUNCTION__, __LINE__);
inputVideoStreamIndex = i;
inputVideoStream = inputFormatCtx->streams[i];
}
if(inputFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
{
NSLog(@"%s - %d # Found Audio Stream", __PRETTY_FUNCTION__, __LINE__);
inputAudioStreamIndex = i;
inputAudioStream = inputFormatCtx->streams[i];
}
}
if(inputVideoStreamIndex == -1 && inputAudioStreamIndex == -1)
{
NSLog(@"%s - %d # Have not found any Video or Audio stream", __PRETTY_FUNCTION__, __LINE__);
}
/*
* Finding duration of the stream
*/
if(inputFormatCtx->duration == AV_NOPTS_VALUE)
{
NSLog(@"%s - %d # Undefined timestamp value", __PRETTY_FUNCTION__, __LINE__);
if(_videoStream != -1 && inputFormatCtx->streams[_videoStream])
{
// if(inputFormatCtx->streams[_videoStream]->duration != AV_NOPTS_VALUE)
// {
inputEndtimeInt64 = (inputFormatCtx->streams[_videoStream]->duration)/(inputFormatCtx->streams[_videoStream]->time_base.den/inputFormatCtx->streams[_videoStream]->time_base.num);
// }
// else
// {
// inputEndtimeInt64 = (inputFormatCtx->duration)/(AV_TIME_BASE);
//
// }
}
else if(_audioStream != -1 && inputFormatCtx->streams[_audioStream])
{
// if(inputFormatCtx->streams[_audioStream]->duration != AV_NOPTS_VALUE)
// {
inputEndtimeInt64 = (inputFormatCtx->streams[_audioStream]->duration)/(AV_TIME_BASE);
// }
// else
// {
// inputEndtimeInt64 = (inputFormatCtx->duration)/(AV_TIME_BASE);
//
// }
}
}
else
{
NSLog(@"%s - %d # Defined timestamp value", __PRETTY_FUNCTION__, __LINE__);
inputEndtimeInt64 = (inputFormatCtx->duration)/(AV_TIME_BASE);
}
NSLog(@"%s - %d # inputEndtimeInt64 = %lld", __PRETTY_FUNCTION__, __LINE__, inputEndtimeInt64);
/*
* Finding out the frame rate
*/
if(_videoStream != -1 && inputFormatCtx->streams[_videoStream])
{
framesPerSec = (inputFormatCtx->streams[_videoStream]->r_frame_rate.num)/ (inputFormatCtx->streams[_videoStream]->r_frame_rate.den);
}
else
{
framesPerSec = 24;
}
numberOfFrames = framesPerSec * (int) inputEndtimeInt64;
NSLog(@"%s - %d # numberOfFrames = %d", __PRETTY_FUNCTION__, __LINE__, numberOfFrames);
/*
* Seek to timestamp ts.
*
* avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
*/
if(avformat_seek_file(inputFormatCtx, inputAudioStreamIndex, INT64_MIN, outputStartTimeInt64, INT64_MAX, AVSEEK_FLAG_FRAME) < 0)
{
NSLog(@"%s - %d # Seek OK", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Seek ERROR", __PRETTY_FUNCTION__, __LINE__);
}
/*
* Creating output file path1
*/
// NSString * timestamp = [NSString stringWithFormat:@"%f",[[NSDate date] timeIntervalSince1970] * 1000];
//
// NSArray *directoryPathsArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
// NSString *documentsDirectory = [directoryPathsArray objectAtIndex:0];
// NSString *outputFilePath = [NSString stringWithFormat:@"%@/%@.mov",documentsDirectory,timestamp]; // Not working if we replace .avi with .mp4
NSString* filename = [NSString stringWithFormat:@"IPCamera%d.mov", _currentFile];
NSString* outputFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
_url = [NSURL fileURLWithPath:outputFilePath];
/*
* Return the output format in the list of registered output formats
* which best matches the provided parameters, or return NULL if
* there is no match.
*
* av_guess_format(const char *short_name, const char *filename, const char *mime_type)
*/
outputFormat = av_guess_format(NULL, [outputFilePath UTF8String], NULL);
NSLog(@"%s - %d # outputFormat->name = %s", __PRETTY_FUNCTION__, __LINE__, outputFormat->name);
if(outputFormat == NULL)
{
NSLog(@"%s - %d # outputFormat == NULL", __PRETTY_FUNCTION__, __LINE__);
}
else
{
/*
* Allocate an AVFormatContext.
*/
outputContext = avformat_alloc_context();
if(outputContext)
{
outputContext->oformat = outputFormat; // The output container format.
snprintf(outputContext->filename, sizeof(outputContext->filename), "%s", [outputFilePath UTF8String]);
}
else
{
NSLog(@"%s - %d # outputContext == NULL", __PRETTY_FUNCTION__, __LINE__);
}
}
outputVideoCodec = outputAudioCodec = NULL;
/*
* video_codec = default video codec
*/
if(outputFormat->video_codec != AV_CODEC_ID_NONE && inputVideoStream != NULL)
{
/*
* Find a registered encoder with a matching codec ID.
*
* avcodec_find_encoder(enum AVCodecID id)
*/
outputVideoCodec = avcodec_find_encoder(outputFormat->video_codec);
if(NULL == outputVideoCodec)
{
NSLog(@"%s - %d # Could Not Find Vid Encoder", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Found Out Vid Encoder", __PRETTY_FUNCTION__, __LINE__);
/*
* Add a new stream to a media file.
*
* avformat_new_stream(AVFormatContext *s, const AVCodec *c)
*/
outputVideoStream = avformat_new_stream(outputContext, outputVideoCodec);
if(NULL == outputVideoStream)
{
NSLog(@"%s - %d # Failed to Allocate Output Vid Strm", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Allocated Video Stream", __PRETTY_FUNCTION__, __LINE__);
/*
* Copy the settings of the source AVCodecContext into the destination AVCodecContext.
*
* avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
*/
if(avcodec_copy_context(outputVideoStream->codec, inputFormatCtx->streams[inputVideoStreamIndex]->codec) != 0)
{
NSLog(@"%s - %d # Failed to Copy Context", __PRETTY_FUNCTION__, __LINE__);
}
else
{
AVStream *st = _formatCtx->streams[_videoStream];
outputVideoStream->sample_aspect_ratio.den = outputVideoStream->codec->sample_aspect_ratio.den; // denominator
outputVideoStream->sample_aspect_ratio.num = st->codec->sample_aspect_ratio.num; // numerator
NSLog(@"%s - %d # Copied Context 1", __PRETTY_FUNCTION__, __LINE__);
outputVideoStream->codec->codec_id = st->codec->codec_id;
outputVideoStream->codec->time_base.num = st->codec->time_base.num;
outputVideoStream->codec->time_base.den = STREAM_FRAME_RATE;
outputVideoStream->time_base.num = st->time_base.num;
outputVideoStream->time_base.den = st->time_base.den;
outputVideoStream->r_frame_rate.num =st->r_frame_rate.num;
outputVideoStream->nb_frames = STREAM_NB_FRAMES;
outputVideoStream->r_frame_rate.den = st->r_frame_rate.den;
outputVideoStream->avg_frame_rate.den = st->avg_frame_rate.num;
outputVideoStream->avg_frame_rate.num = st->avg_frame_rate.num;
// outputVideoStream->duration = st->duration;
}
}
}
}
if(outputFormat->audio_codec != AV_CODEC_ID_NONE && inputAudioStream != NULL)
{
outputAudioCodec = avcodec_find_encoder(outputFormat->audio_codec);
if(NULL == outputAudioCodec)
{
NSLog(@"%s - %d # Could Not Find Out Aud Encoder", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Found Out Aud Encoder", __PRETTY_FUNCTION__, __LINE__);
outputAudioStream = avformat_new_stream(outputContext, outputAudioCodec);
if(NULL == outputAudioStream)
{
NSLog(@"%s - %d # Failed to Allocate Out Vid Strm", __PRETTY_FUNCTION__, __LINE__);
}
else
{
if(avcodec_copy_context(outputAudioStream->codec, inputFormatCtx->streams[inputAudioStreamIndex]->codec) != 0)
{
NSLog(@"%s - %d # Failed to Copy Context", __PRETTY_FUNCTION__, __LINE__);
}
else
{
// AVStream *st = _formatCtx->streams[_audioStream];
NSLog(@"%s - %d # Copied Context 2", __PRETTY_FUNCTION__, __LINE__);
outputAudioStream->codec->codec_id = inputAudioStream->codec->codec_id;
outputAudioStream->codec->codec_tag = 0;
// outputAudioStream->pts = inputAudioStream->pts;
// outputAudioStream->duration = inputAudioStream->duration;
outputAudioStream->time_base.num = inputAudioStream->time_base.num;
outputAudioStream->time_base.den = inputAudioStream->time_base.den;
}
}
}
}
if (!(outputFormat->flags & AVFMT_NOFILE))
{
/*
* Create and initialize a AVIOContext for accessing the resource indicated by url.
*
* avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
*/
if (avio_open2(&outputContext->pb, [outputFilePath UTF8String], AVIO_FLAG_WRITE, NULL, NULL) < 0)
{
NSLog(@"%s - %d # Could Not Open File", __PRETTY_FUNCTION__, __LINE__);
}
}
/* Write the stream header, if any. */
/*
* Allocate the stream private data and write the stream header to an output media file.
*
* avformat_write_header(AVFormatContext *s, AVDictionary **options);
*/
if (avformat_write_header(outputContext, NULL) < 0)
{
NSLog(@"%s - %d # Error Occurred While Writing Header", __PRETTY_FUNCTION__, __LINE__);
}
else
{
NSLog(@"%s - %d # Written Output header", __PRETTY_FUNCTION__, __LINE__);
initDone = true;
}
return kxMovieErrorNone;
}
更多信息，我联系了Red5Pro团队，并询问他们有关视频演示的信息。他们这样回答我
最有可能发生的事情是该项目正在加载的FFMPEG版本与我们SDK中嵌入的自定义版本不兼容，并且某些重复的定义错误导致加载了错误的版本。该项目中的其中一个库与SDK或sdk所需的支持库之一之间也可能存在许多冲突（我必须假设自编译之后，您确实添加了第四步中列出的库）此处：https://www.red5pro.com/docs/streaming/ios.html#project-setup），如果是这种情况，我不知道要解决此问题的好方法，因为追逐那些与我们的SDK不兼容的第三方库以解决这些问题超出了我们的能力范围球队。 （已编辑）
有人知道在哪里看吗？
谢谢
答案 0 :(得分：5)
向Red5Pro SDK中嵌入的FFMPEG定制版本请求源代码。在您的代码中使用该版本可消除不兼容性。根据FFMPEG的GPL / LGPL许可，他们必须向您提供经过修改的源代码。