3GP with 320x240 not possible?

[ahollmann]

I tried to make a 3GP Video with resolution 320x240 and got an emptx file (0 bytes).
With default resolution 176x144 everything is OK.

But generally 3GP supports 320x240 and a few other resolutions.

So how can I generate a 320x240 3GP?

Any hints?

[Chris K]

I don't know if the 3gp specs support 320x240 but FFmpeg doesn't.

[h263 @ 0x17c5bc0]The specified picture size of 320x240 is not valid for the H.263 codec.

Valid sizes are 128x96, 176x144, 352x288, 704x576, and 1408x1152. Try H.263+.

Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

352x288 comes close. Perhaps the current 3gp specs allow another codec

EDIT:

Can you set FFmpeX to x264 codec in 3gp container?
This works with 320x240 from the FFmpeg command line and is supported by the 3gp specs.

[Case]

QuickTime Pro allows export to a number of 3G presets (3GPP and 3GPP2) and configurations, including the H.263 codec, MPEG-4 (like XviD) codec, and the H.264 codec. 3GPP2 can be used to create 320x240 clips, although that resolution (and related data rate) limits compatibility (no playback guarantee on all 3GP devices).