[Live-devel] Questions about project to dump Images frames from H264 stream using live555 and ffmpeg

[Brad O'Hearne]

Sounds like a few of us ought to get together and conjure up a sample for this use case -- seems like this use-case is becoming increasingly common, though it ought to be, given that there's no native real-time video option on either iOS or Android. 

Brad

Brad O'Hearne
Founder / Lead Developer
Big Hill Software LLC
http://www.bighillsoftware.com

On Mar 2, 2012, at 10:23 AM, David Scravaglieri wrote:

> Thank you Barry I will try.
> 
> David.
> 
> Le 2 mars 2012 à 18:05, Barry Stump a écrit :
> 
>> At a minimum, you will probably need to add the MPEG start code 0x00000001 to each frame before passing it to your decoder.  See H264VideoFileSink::afterGettingFrame1() for an example of this.
>> 
>> You may or may not need to deal with parsing the SProp string depending on whether your H.264 stream contains SPS/PPS NAL units.  The mailing list has past discussions on this topic.
>> 
>> While configuring and using FFmpeg is outside the scope of this list, your primary decode function will probably be avcodec_decode_video2() from libavcodec.
>> 
>> -Barry
>> 
>> On Fri, Mar 2, 2012 at 2:10 AM, David Scravaglieri <ds at viddiga.com> wrote:
>> Hi,
>> 
>> Well I am really stuck.
>> 
>> My project is to dump Images from a live H264 stream using live555 and ffmpeg.
>> 
>> I started with the testRTSPClient prog and in the afterGettingFrame method I want to send the fReceiveBuffer to a class that will decode each frames with ffmpeg and dump all images to a directory. But I can't find any clear sample code or clear HowTo method in order to do that.
>> 
>> I have read some posts in the mailinglist. But it's not clear.
>> How to create a suitable ffmpeg codec context for consuming the fReceiveBuffer ?
>> What about using parseSPropParameterSets ?
>> Do I have to use ffmpeg av_parser_parse2 method ?
>> 
>> Any help would be appreciated.
>> 
>> Thanks in advance,
>> David.
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