doron jacoby wrote:
Hi,
I am trying to view video stream which was generated using x264, with
multislice enabled. for some reason, i fail to watch the stream using my a
viewer which is based on FFMPEG.
On the client side i got lots of errors: [h264 @ 0xaaa05c00] concealing 1536
DC, 1536 AC, 1536 MV errors
Looking in my client software, i saw that during decoder initialization i
check if it support CODEC_CAP_TRUNCATED, and it doesn't.
When i used older FFMPEG lib, everything works fine; CODEC_CAP_TRUNCATED was
supported, and multislice works fine.
i am using latest x264 and FFMPEG code, compile and run them on Windows,
using Msys for compilation.
Can anyone think of a reason why it's not working? can anyone explain what
is CODEC_CAP_TRUNCATED
For a decoder, CODEC_CAP_TRUNCATED means that it can accept partial
compressed data (i.e. not aligned with picture start/end.) So you can
feed it short little packets if that is convenient. However, if this bit
is not set, you must feed the decoder one single complete compressed
picture at a time.
In the case of H264, you should now use the H264 parser to pre-process
the incoming stream. The H264 parser knows how to gather multiple short
packets to create a complete NALU, which your code can then give to the
H264 decoder.
Mike Scheutzow
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