That because the most of Mobile Phone records the video with bad quality camra, and the first few frames very dark not the the transposing makes image broken.
Regards, -------------------------------------------------------------------------------------------------------------------------------------- Freeman Mobile: 13811178263 E-Mail: [email protected] ________________________________________ 发件人: [email protected] [[email protected]] 代表 Carl Eugen Hoyos [[email protected]] 发送时间: 2013年3月23日 4:23 收件人: [email protected] 主题: Re: [Libav-user] 答复: How to extract a H264 video frame (container is 3GPP/MP4) into a JPG File (with libavformat and libavcode) ? 张弘强 <zhanghongqiang@...> writes: > ffmpeg -i video_clip.3gp -vframes 1 -ss 00:00:01 > -vf "transpose=1" output.jpg > (the first frame is not good enough) Do you mean the first frame is black / does not show the information you would like to have in your output jpg or is there something wrong with the transoding like for example a non-keyframe gets encoded and the output image is broken? If that is the case, please provide your complete, uncut console output and a sample. Please do not top-post here, Carl Eugen _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
