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Hello,<br>
Just wondering why are using FFmpeg for this kind of stuff? Why not
just send it to socket as reader ask? If I understand correctly you
are not encoding on fly this WEBM.<br>
<br>
Tuukka<br>
<br>
<div class="moz-cite-prefix">13.07.2015, 13:28, Austin Einter
kirjoitti:<br>
</div>
<blockquote
cite="mid:CANXt1k9XErQGxRSm9=2ccdtKKQ0iehwHpq2DOgVGuEgSbXmc=A@mail.gmail.com"
type="cite">
<div dir="ltr">I am trying to use ffmpeg libav, and have been
doing a lot of experiment last 1 month.Â
I have not been able to get through. Is it really difficult to
use FFmpeg?<br>
<br>
My requirement is simple as below.<br>
Can you please guide me if ffmpeg is suitable one or I have
implement<br>
on my own (using codec libs available).<br>
<br>
1. I have a webm file (having VP8 and OPUS frames)<br>
2. I will read the encoded data and send it to remote guy<br>
3. The remote guy will read the encoded data from socket<br>
4. The remote guy will write it to a file (can we avoid
decoding).<br>
5. Then remote guy should be able to pay the file using ffplay
or any player.<br>
<br>
<br>
<br>
Now I will take a specific example.<br>
1. Say I have a file small.webm, containing VP8Â and OPUS
frames.<br>
<br>
2. I am reading only audio frames (OPUS) using av_read_frame api
(Then<br>
checks stream index and filters audio frames only)<br>
<br>
3. So now I have data buffer (encoded) as packet.data and
encoded data<br>
buffer size as packet.size (Please correct me if wrong)<br>
<br>
4. Here is my first doubt, everytime audio packet size is not
same,<br>
why the difference. Sometimes packet size is as low as 54 bytes
and<br>
sometimes it is 420 bytes. For OPUS will frame size vary from
time to<br>
time?<br>
<br>
5. Next say somehow extract a single frame (really do not know
how to<br>
extract a single frame) from packet and send it to remote guy.<br>
<br>
6. Now remote guy need to write the buffer to a file. To write
the<br>
file we can use av_interleaved_write_frame or av_write_frame
api. Both<br>
of them takes AVPacket as argument. Now I can have a AVPacket,
set its<br>
data and size member. Then I can call av_write_frame api. But
that<br>
does not work. Reason may be one should set other members in
packet<br>
like ts, dts, pts etc. But I do not have such informations to
set.<br>
<br>
<br>
Can somebody help me to learn if FFmpeg is the right choice, or
should<br>
I write a custom logic like parse a opus file and get frame by
frame.</div>
<br>
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<br>
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