[FFmpeg-devel] 答复: [PATCH] flv format support mp3 audio with 48khz

Steven Liu lingjiujianke at gmail.com
Tue Sep 27 18:55:40 EEST 2016


2016-09-27 23:30 GMT+08:00 付 秋平 <fu.qiuping at hotmail.com>:

> AAC 48khz has alreay been supported in flv_enc.c file, when the flv with
> audio format is aac
>
> it just set it into:
>
> if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
>         return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
>                FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
>
> when i use ffmpeg in the live video stream project, some user publish the
> rtmp stream with (h264 and mp3 48khz)
> then i need to use ffmpeg to convert the "rtmp" live stream to "flv" live
> stream,  ffmpeg can not support and make a warning.
> so i change this code to make it support this.
> ________________________________
> 发件人: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> 代表 Steven Liu <
> lingjiujianke at gmail.com>
> 发送时间: 2016年9月27日 15:15
> 收件人: FFmpeg development discussions and patches
> 主题: Re: [FFmpeg-devel] [PATCH] flv format support mp3 audio with 48khz
>
> 2016-09-27 23:01 GMT+08:00 <fu.qiuping at hotmail.com>:
>
> > From: frankos2 <frankqpfu at localhost.localdomain>
> >
> > ---
> >  libavformat/flvenc.c |    8 ++++++++
> >  1 files changed, 8 insertions(+), 0 deletions(-)
> >
> > diff --git a/libavformat/flvenc.c b/libavformat/flvenc.c
> > index 99903f5..296426a 100644
> > --- a/libavformat/flvenc.c
> > +++ b/libavformat/flvenc.c
> > @@ -107,6 +107,13 @@ static int get_audio_flags(AVFormatContext *s,
> > AVCodecParameters *par)
> >          return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ |
> > FLV_SAMPLESSIZE_16BIT;
> >      } else {
> >          switch (par->sample_rate) {
> > +        case 48000:
> > +            if (par->codec_id == AV_CODEC_ID_MP3) {
> > +                flags |= FLV_SAMPLERATE_44100HZ;
> >
> and you can support aac too.
>
> > +                break;
> > +            } else {
> > +                goto error;
> > +            }
> >          case 44100:
> >              flags |= FLV_SAMPLERATE_44100HZ;
> >              break;
> > @@ -124,6 +131,7 @@ static int get_audio_flags(AVFormatContext *s,
> > AVCodecParameters *par)
> >                  break;
> >              }
> >          default:
> > +error:
> >              av_log(s, AV_LOG_ERROR,
> >                     "FLV does not support sample rate %d, "
> >                     "choose from (44100, 22050, 11025)\n",
> > par->sample_rate);
> > --
> > 1.7.1
> >
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Ok, LGTM, thanks!


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