Re: [Audacity-devel] [Libav-user] Requesting help to port Audacity to recent FFmpeg

[Vaughan J. <va...@au...>]

Thanks to both of you!

- V

On 5/23/2014 2:23 PM, Benjamin Drung wrote:
> Hi Michael,
>
> Am Mittwoch, den 21.05.2014, 02:16 +0200 schrieb Michael Niedermayer:
>>> I like to commit your
>>> work to the Audacity SVN so that we have both - support for FFmpeg and
>>> Gstreamer.
>>
>> that sounds great
>
> I committed your code to the Audacity SVN with your name in
> Signed-off-by, because I failed to find a git-am equivalent to preserve
> the committer and date. Thanks for your work.
>
> While committing, I made some small indentation adjustments. Audacity
> uses 3 spaces for indentation and some of your changes used 4 spaces. I
> merged your debug fprintf removal into the respective commit. I also
> committed my libav 9 support patch.
>
>>> 2) I can't export audio as mp4. Neither as mp4 export, nor as custom
>>> FFmpeg export (can't be selected there). FFmpeg has mp4 support enabled:
>>>
>>> $ ffmpeg -formats 2>/dev/null | grep mp4
>>>   D  mov,mp4,m4a,3gp,3g2,mj2 QuickTime / MOV
>>>    E mp4             MP4 (MPEG-4 Part 14)
>>
>> hmmm, what do you mean by "mp4" ?
>> there are alot of audio codecs that can be stored in mp4, for example
>> aac, mp3, vorbis, also there are multiple ways to encode aac, libfaac
>> ffmpegs native encoder and a few others ...
>>
>> I tried a few things and found a few bugs (which i fixed) but iam
>> not convinced i fixed the issue you describe
>
> Sorry. My description was imprecise and incorrectly (m4a instead of
> mp4). I was talking about File -> Export Audio... -> "M4A (AAC) Files
> (FFmpeg)". When selecting this format, the exported file has 0 bytes
> content. Selecting "Custom FFmpeg Export" and then "mp4" format and
> "aac" codec, the result will be the same (empty exported file). The same
> applies for the wav format with pcm_s16le codec.
>