Audo test mp4 file

[Nick Ludlam]

On 15 Mar 2011, at 11:51, Charles Johnson wrote:

> Nick Ludlam wrote:
>> On 15 Mar 2011, at 10:58, Charles Johnson wrote:
>> 
>>  
>>> btw, i noticed that it looks like libfaac support is disabled by default in ffmpeg HEAD. Is this true and is it relevant?:
>>> 
>>>    
>>>>> --enable-libfaac         enable FAAC support via libfaac [no]<<
>>>>>        
>> 
>> No, this isn't an issue for us, as we're simply unwrapping the existing aac encode from inside the flash wrapper, and re-wrapping it as an mp4/m4a file. We don't actually make the aac itself. If you look at the output from "ffmpeg -formats", the important lines will be:
>> 
>> E mp4             MP4 format
>> DE flv             FLV format
>> 
>> This means it can encode the mp4 format, and both decode and encode Flash (we care about decoding only).
>> 
>> Nick
>> 
>>  
> Thanks for that Nick.  In my case though, mp4 is not useable, so i need to transcode aac to mp3. Given Linux rtmpdump and ffmpeg, can you say what my command should be? At the moment, my script is as below, but of course this leaves me with aac:
> 
> ============
> mode_du_jour=flashaaclow
> get_iplayer --mode=${mode_du_jour} --flvstreamer=/usr/local/bin/rtmpdump --get "${@}"
> ============


When you say the mp4 is not usable, do you mean it's corrupt, or that you can't use it with your playback needs? What version of ffmpeg are you using? Can you paste the verbose output of get_iplayer running?


Nick