Opened 15 years ago

Closed 15 years ago

Last modified 15 years ago

#145 closed defect (fixed)

Double-rate audio in .3gp files

Reported by: richardv@… Owned by: r_togni@…
Priority: normal Component: demuxer
Version: 1.0pre6 Severity: normal
Keywords: Cc:
Blocked By: Blocking:
Reproduced by developer: Analyzed by developer:


I've been doing some work in trying to persuade mplayer to handle 3gp files
containing amr audio. I found that they tended to play at double speed; this is
addressed by a patch I'll attach in a minute. Performing the patch, and using a
version of libavcodec with an amr decoder, then allows these files to be played

(The technical details of the patch are that 3gp files contain a mono audio
stream, but, for some reason, have a '2' where the number of channels is
specified. Ffmpeg handles this by special-casing amr audio chunks, so I've done
the same thing here.)

Attachments (1)

mplayer-amr.diff (3.2 KB) - added by richardv@… 15 years ago.
3gp playback patch

Download all attachments as: .zip

Change History (5)

Changed 15 years ago by richardv@…

3gp playback patch

comment:1 Changed 15 years ago by richardv@…

comment:2 Changed 15 years ago by r_togni@…

  • Status changed from new to assigned

Please test the patch i sent to mplayer-dev-eng to add 3gp/amr support (mov
demuxer fixes are based on your patch)

comment:3 Changed 15 years ago by r_togni@…

  • Owner changed from moritz@… to r_togni@…
  • Status changed from assigned to new

comment:4 Changed 15 years ago by r_togni@…

  • Resolution set to fixed
  • Status changed from new to closed

Patch committed, and added support for amr codecs

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