Hi everyone,
I have got some troubles with ffmpeg plug-in.
I found, that it can play video file only one time. After finishing file, the
second playing starting without sound and after 1 second has become frozen.
I found that the next code in plug-in processes the finishing of stream of
packets:
// Read the next frame packet
if (av_read_frame(m_format_context.get(), &packet) < 0)
{
if (url_ferror(m_format_context->pb) == 0)
end_of_stream = true;
else
throw std::runtime_error("av_read_frame() failed");
}
if (end_of_stream)
{
// If we reach the end of the stream, change the decoder state
if (loop())
{
m_clocks.reset(m_start);
rewindButDontFlushQueues();
}
else
m_state = END_OF_STREAM;
return false;
}
As a result, video either is looped or is stopped as stream. However, the state
END_OF_STREAM in class FFmpegDecoderAudio interrupts computing present time and
interrupts synchronization between audio and video streams
if (m_packet.type == FFmpegPacket::PACKET_DATA)
{
if (m_packet.packet.pts != int64_t(AV_NOPTS_VALUE))
{
const double pts = av_q2d(m_stream->time_base) *
m_packet.packet.pts;
m_clocks.audioSetBufferEndPts(pts);
}
m_bytes_remaining = m_packet.packet.size;
m_packet_data = m_packet.packet.data;
}
else if (m_packet.type == FFmpegPacket::PACKET_END_OF_STREAM)
{
m_end_of_stream = true;
}
else if (m_packet.type == FFmpegPacket::PACKET_FLUSH)
{
avcodec_flush_buffers(m_context);
}
// just output silence when we reached the end of stream
if (m_end_of_stream)
{
memset(buffer, 0, size);
return size;
}
More over, class FFmpegImageStream does not have any callback function for the
catching of the moment finishing of file. It means that the branch of _status
== PLAYING is still when video stream is finished
// Обработка команд управления
while (! done)
{
// Обработка условия воспроизведения
if (_status == PLAYING)
{
I create one decision of these problems:
if (loop())
{
// Если воспроизведение зацикленно, то
повторить цикл
m_clocks.reset(m_start);
rewindButDontFlushQueues();
m_stop = false;
}
else
{
if(m_device)
m_state = END_OF_STREAM; // Если источник сигнала видеоустройство
else
{
FFmpegImageStream * const this_ =
reinterpret_cast<FFmpegImageStream*>(m_imageStream);
f(this_)
{
this_->microSleep(3000000);
this_->rewind();
this_->pause();
}
}
}
Where m_device is a bool switch which has state true for live cam and false for
local file. For the second state FFmpegImageStream has been gotten and after
stopping process on 3 second the stream is rewind and state to pause. The video
file can be played repeatedly.
I know that this trick looks ugly and wait any another idea.
With best regards.
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=52854#52854
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