[FFmpeg-user] Strange output of ffprobe
jerome at mediaarea.net
Fri Oct 28 00:11:51 EEST 2016
Le 27/10/2016 à 18:06, Анатолий Коростелев a écrit :
> Recently I recieved a mp4 for playing. When I tried to play this file
> I didn't hear any sound in some players (in ffplay sound worked). When
> I looked at the metadata of this file (via ffprobe), I saw the following:
> Then I used mediainfo utility to see the metadata of the file:
> As you can see the "Sampling rate" in mediainfo is 7 350 Hz (it's
> illegal value)
It is not an illegal value, AAC specs authorize it.
> while "Sampling rate" in ffprobe is 48000 Hz. I think that the problem
> with the sound of this file has been caused by encoder
> errors/misconfiguration. But it's very strange that ffrobe always
> shows me 48000 Hz Sampling rate. Is this a bug or something else?
48000 Hz seems the correct one, so no FFmpeg bug but MediaInfo bug (as a
first shot, issue is that there is an ES descriptor without
AudioSpecificConfig element in the track header and MediaInfo does not
manage correctly this case; note that this may be the reason some
players does not play sound).
Jérôme, developer of MediaInfo.
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