Hi, I have tried the metadata in ffmpeg command line application (ffmpeg -i input.mp4 -metadata:s:v rotate="0" -vcodec copy -acodec copy output.mp4), but seems it changes the matrix in tkhd globally... I also googled a lot for the sample 3gp/mp4 file, but I haven't found any yet.
However, in 3gpp ts 26.244 http://www.etsi.org/deliver/etsi_ts/126200_126299/126244/12.03.00_60/ts_126244v120300p.pdf, 6.11 CVOSampleEntry box, it describes the 3gvo box, but I got confused where to get the frame number for rotation and how to connect data reference boxes to 3gvo box. Thanks again for your help~:P Best, Yisheng On Tue, Mar 29, 2016 at 6:25 AM, Carl Eugen Hoyos <[email protected]> wrote: > Yisheng Zhao <yz1134@...> writes: > > > I have a question if video orientation is supported in3gp/mp4 > > in FFmpeg/libav? > > > > a "3gvo" box is used to specify the video orientation~ > > Please provide a sample. > > Carl Eugen > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
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