[FFmpeg-user] how to display metadata?

[sean darcy]

On 03/25/2011 02:37 PM, sean darcy wrote:
> On 03/25/2011 11:27 AM, James Darnley wrote:
>> On 25/03/2011, sean darcy<seandarcy2 at gmail.com> wrote:
>>> I've prepared a speech:
>>>
>>> ffmpeg -i "speech_1.wav" -metadata track="1" -metadata title="My Speech"
>>> -acodec aac -ab 128000 -strict experimental speech_1.aac
>>>
>>> which seems to work fine, the track and title show on the console
>>> output.
>>>
>>> But:
>>>
>>> ffmpeg -i speech.aac
>>> Input #0, aac, from 'speech_1.aac':
>>> Duration: 00:01:44.95, bitrate: 128 kb/s
>>> Stream #0.0: Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
>>
>> That suggests the output format doesn't actually support metadata
>
> Huh? aac doesn't support metadata?
>
> It certainly looks like it does:
>
> ffmpeg -i "Track 1.wav" -metadata track=1 -metadata title="Test Track"
> -acodec aac -ab 128000 -strict experimental Track_1.aac
> ...............
> Input #0, wav, from 'Track 1.wav':
> Duration: 00:02:01.88, bitrate: 1411 kb/s
> Stream #0.0: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
> Output #0, adts, to 'Track_1.aac':
> Metadata:
> title : Test Track
> track : 1
> encoder : Lavf52.73.0
> Stream #0.0: Audio: aac, 44100 Hz, 2 channels, s16, 128 kb/s
> .......
>
> But:
>
> ffprobe Track_1.aac
> Input #0, aac, from 'Track_1.aac':
> Duration: 00:01:44.95, bitrate: 128 kb/s
> Stream #0.0: Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
>
>
> So I guess the question is whether the aac encoder is creating the
> metadata, or is ffprobe not reading it?
>
> And shouldn't EasyTag be able to read it if the metadata were there?
>
> sean

Well, it seems the aac encoder just isn't writing the metadata:

ffmpeg -i "Track 1.wav" -metadata track=1 -metadata title="Test Track" 
-acodec libmp3lame -ab 128000  Track_1.mp3
.........

ffprobe Track_1.mp3
Input #0, mp3, from 'Track_1.mp3':
   Metadata:
     TIT2            : Test Track
     TRCK            : 1
     TSSE            : Lavf52.73.0
   Duration: 00:02:01.91, start: 0.000000, bitrate: 127 kb/s
     Stream #0.0: Audio: mp3, 44100 Hz, 2 channels, s16, 128 kb/s

sean