[Libav-user] How to specify the audio sample format when opening a file

[FFMPEG]

Thanks Carl,

Yes, I checked the AAC decoder code and found that only AV_SAMPLE_FMT_FLTP is supported.
So I have to do conversion myself.

Thanks!

在 2013-2-6，21:17，Carl Eugen Hoyos <cehoyos at ag.or.at> 写道：

> 黄轩宇 <xuanyu.huang at ...> writes:
> 
>> Our application, when used with old version to 
>> open a MP4 file with AAC encoded audio, the populated 
>> pAudioCodecCtx->sample_fmt == AV_SAMPLE_FMT_FLP, but 
>> when used with latest FFMPEG version, this value 
>> changed to AV_SAMPLE_FMT_FLTP. 
>> 
>> I found a member AVCodecContext::request_sample_fmt 
>> which is said can be set by user.
> 
> This is not a solution because most decoders 
> only support one sample_fmt.
> 
> Use the aconvert filter to convert between 
> sample formats.
> 
> Carl Eugen
> 
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