The error is reported because not all streams in the container are supported. For BigBuckBunny_DivX_HD720p_ASP.divx, there are two audio streams of different types, ac3 and mp3, and I think the first one is not supported. For H263_56_AMRNB_6.3gp, the AMR audio track is not supported. For both cases, intalling more codecs removes the errors.
There is clearly a problem with the video with 2 audio tracks, as no error should be displayed when there is at least one stream available for video and another one for audio. For the second video I would say that the bug is displaying "Video format not supported" as it should be instead "Audio format not supported".
The error is reported because not all streams in the container are supported. For BigBuckBunny_ DivX_HD720p_ ASP.divx, there are two audio streams of different types, ac3 and mp3, and I think the first one is not supported. For H263_56_ AMRNB_6. 3gp, the AMR audio track is not supported. For both cases, intalling more codecs removes the errors.
There is clearly a problem with the video with 2 audio tracks, as no error should be displayed when there is at least one stream available for video and another one for audio. For the second video I would say that the bug is displaying "Video format not supported" as it should be instead "Audio format not supported".