AW: AW: MP4 files wit AAC

[Thornton, Keith]

Hi, 

ffplay outputs the following form y file with avenc_aac
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/temp/mit_audio__0000.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomiso2
    creation_time   : 2016-04-28 10:55:59
  Duration: 00:00:19.74, start: 0.000000, bitrate: 12263 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 12133 kb/s, 50 fps, 50 tbr, 5k tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2016-04-28 10:55:59
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 168 kb/s (default)
    Metadata:
      creation_time   : 2016-04-28 10:55:59
      handler_name    : SoundHandler
   2.99 A-V: -0.020 fd=  23 aq=   15KB vq= 1069KB sq=    0B f=0/0

And 


Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/temp/mit_audio__0000_ffmpeg.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.19.100
  Duration: 00:00:19.66, start: 0.036281, bitrate: 12271 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 12133 kb/s, 50 fps, 50 tbr, 10k tbn, 100 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
   2.25 A-V:  0.004 fd=  15 aq=   12KB vq= 1096KB sq=    0B f=0/0

For the file after audio has been transcoded.
Video was not transcoded  (-vcodec=copy)

According to ffplay

Ok for WindowsMediaplayer or QuickTimePlayer:

    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41

Not Ok for WindowsMediaplayer or QuickTimePlayer:

    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomiso2


-----Ursprüngliche Nachricht-----
Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] Im Auftrag von Tim Müller
Gesendet: Donnerstag, 15. September 2016 09:56
An: gstreamer-devel at lists.freedesktop.org
Betreff: Re: AW: MP4 files wit AAC

On Thu, 2016-09-15 at 05:29 +0000, Thornton, Keith wrote:

Hi Keith,

> If I use ffmpeg to transcode them from mp4/h264/aac to mp4/h264/aac 
> the files are then playable so what I need to know is what is ffmpeg 
> doing that the avenc_aac is not doing.

It would be interesting to see the output of gst-discoverer-1.0 -v and ffplay on a gst/avenc_acc-produced file vs. an ffmpeg-transcoded one then.

Maybe it's a codec profile thing or so.

Cheers
 -Tim

--
Tim Müller, Centricular Ltd - http://www.centricular.com

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