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

[付 秋平]

I have already tried the "mp3_audio_48khz" flv live stream and rtmp live stream in the adobe flash player.

It supports the format and works well.

________________________________
发件人: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> 代表 Yusuke Nakamura <muken.the.vfrmaniac at gmail.com>
发送时间: 2016年9月27日 21:15
收件人: FFmpeg development discussions and patches
主题: Re: [FFmpeg-devel] [PATCH] flv format support mp3 audio with 48khz

2016-09-28 0:01 GMT+09:00 <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;
> +                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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>

Out of the spec I think. Did you confirm that Adobe (Flash Player) allows
48kHz mp3? About AAC, the spec (Adobe Flash Video File Format
Specification) says the Flash Player ignores sample rate in AudioTagHeader,
which is a dummy, and extracts the actual sample rate from AAC bitstream.
But the spec does not say about MP3 in the same way.
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