I have Ubuntu 14.04, videoplayer Totem, and when I play video in 3gp using this videoplayer or any other, I can't hear a sound! How to solve this problem??
The container format 3gp most commonly contains the following codecs (I have added links to samples for testing):
H.263 video and AAC audio
H.263 video and AMR audio
Other codecs are possible (notably H.264 video and different favours of AAC audio) but these are the most commonly seen. These 2 samples (which I created myself with FFmpeg) play with Totem under Trusty Tahr with the addition of some gstreamer plugins, these are not present on a default installation of Trusty:
sudo apt-get install gstreamer1.0-libav
With these downloaded and installed both sound and video should be fine. See this on my own Trusty installation:
The sound is not great but certainly should be able to be heard...
Other good choices for playback if you are still not happy with Totem's efforts are vlc and SMplayer:
sudo apt-get install vlc smplayer
and these two great players also have no issues with these two 3gp files on my Trusty system...
The sample files were created as follows, using the latest git revision of FFmpeg:
ffmpeg -i "The Swan of Tuonela.mp4" -s qcif -vcodec h263 \ -acodec aac -ac 1 -ar 8000 -r 25 -ab 12200 test_aac.3gp
ffmpeg -i "The Swan of Tuonela.mp4" -s qcif -vcodec h263 \ -acodec libopencore_amrnb -ac 1 -ar 8000 -r 25 -ab 12200 test_amr.3gp