[FFmpeg-devel] [DISCUSSION] Atrac3+ streams inside PSMF
max_pole at gmx.de
Tue Nov 25 17:43:18 CET 2014
It looks like my previous email has been scrubbed. Therefore, I resubmit
it in another thread. Sorry for that!
I would like to have a support for decoding/demuxing Atrac3+ streams
from PSMF (Playstation movie format).
Although decoding/demuxing of video streams currently does currently
work, audio streams stay still unaccesible. I'm ready to undertake this
task but I need a liitle bit help (see below).
PSMF container can be seen as an extension of MPEG-TS, see here:
In the current FFMpeg, PSMF will be (mis)-identified as MPEG-TS stream.
Atrac Audio is carried out in PRIVATE_STREAM_1 packets. Their format is
proprietary but rather simple to understand.
Atrac3+ audio streams are delivered inside of packets of the same size,
usually 2048 bytes. They usually contain several audio frames. Frames
can be splitted across two packets and need to be stitched together in
Now my questions:
1) what's the proper code to be extended? I attached a very draft patch
that extends the MPEG demuxer. Is it the right place or should I look
for any other?
2) how to deal with multiply frames in a packet? Could you point me to a
3) audio frames can be splitted into two parts and sent with two
different packets in the case audio frame size is not an integral of
2048 bytes. It means the demuxer should save the first part in a
temporary location, wait for the 2nd part and then concatenate these two
parts together. Is there any API or working examples doing that I could
I did never implemented a demuxer of such a complexity so I would
greatly appreciate any help.
Thank you in advance!
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