On 17/06/2011 16:46, Ronald S. Bultje wrote:
Hi Mark,
On Fri, Jun 17, 2011 at 10:08 AM, Mark Kenna
<[email protected]> wrote:
On 17/06/2011 14:38, Ronald S. Bultje wrote:
On Fri, Jun 17, 2011 at 8:54 AM, Mark Kenna
<[email protected]> wrote:
In my application I take various video data formats and transcode them to
FLV (H264/AAC). My question is this:
If the input format were H264, is there any way that I can just put this
into an FLV container (using av_write_frame/av_interleaved_write_frame)
without having to decode and then re-encode it?
ffmpeg-the-commandlinetool has the -vcodec copy option for that. It's
a little more complex because H264 can be annexB or MP4 (see the
bitstream filter), so you may have to convert between the two, but
other than that it pretty much "just works", yes.
Ronald
Hi Ronald
Assuming that the the H264 is in the correct format for FLV, would I have to
know exactly how much data to pass av_write_frame each time or can I just
pass it whatever I have available at the time?
Not sure what you mean, is your source a network packetizer a la RTP
or so? In that case, yes I do think you need packetized input, the
H264 frame AVParser should be able to do that for you.
Ronald
Hi Ronald
Thanks for the information - I was able to get something working but the
CPU usage was nearly the same as if I just decoded the frame using
avcodec_decode (so I stuck with the decode option).
Mark
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