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

[付 秋平]

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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