I'm trying to seek to a byte offset in an MP4 file. I can't use
avformat_seek_file() because the AVFMT_NO_BYTE_SEEK flag is set in the demuxer.
I'm reading the first 150 frames in the file, then seeking to a known file
location. I've been able to use avio_seek to set the m_pFormatCtx->pb->pos
value to the correct offset, but the next call to av_read_frame() puts it right
back to where it was, such that the next frame read is #151. The seek code is:
int64_t filePos = m_posData.GetFrameOffset(frameNum);
int64_t ret = avio_seek(m_pFormatCtx->pb, filePos,
SEEK_SET);
avformat_flush(m_pFormatCtx);
avcodec_flush_buffers(m_pVideoCodecCtx);
avcodec_flush_buffers(m_pAudioCodecCtx);
Is there something else that needs to be called to actually clear up the
internal buffers so that av_read_frame will start at the correct location?
Thanks,
Blake
Blake Williams
Principal Software Engineer, Training and Control Systems
DRS Technologies, Inc.
[Final-New-DRS-Color.png]
645 Anchors Street
Fort Walton Beach, Florida 32548
Tel: 850.302-3281
[email protected]<mailto:[email protected]> ||
www.drs.com<http://www.drs.com/>
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