Hi Boris, On Mon, Nov 04, 2019 at 10:29:10 +0100, Boris wrote: > Hello, > I want to transcode video with exactly the same properties of the input > video in the output video. > I use the transcoding.cc code. In the static int open_output_file(const > char *filename) function, I set encoder parameters like this :
This list (ffmpeg-users) is primarily for the use of the command line tool. For assistance with programming with the libav* libraries, please refer to the mailing list libav-user: https://ffmpeg.org/mailman/listinfo/libav-user Also please note that your code was wrapped in a fashion making it hard to read: http://ffmpeg.org/pipermail/ffmpeg-user/2019-November/045902.html You may want to avoid line breaks in your mailer, or attach a text file instead. > But when I run exiftool on output video and on input video, some values > like video duration, encoder, bit rate, are differente. > Can someone tells me how can I do to keep the same parameters (metada) of > the input video in the output video, please? What are you exactly trying to achieve? If you want *exactly* the same characteristics, you should probably just copy the stream (and the metadata) instead of re-encoding. Duration and bitrate are not metadata. The encoder (metadata) will be different, because it is a different encoder. ;-) You can manipulate the metadata though. If you correctly determine the source's bitrate, you should be able to set it for the encoding, and depending on the encoder, you may achieve the exact same rate. But the input stream may have more characteristics, such as: - VBR, - GOP size, or even - placement of I-frames, - use of B-frames and so on. Which of these do you want to duplicate, which not? And why? If you specify your actual needs more precisely, it may be easier to come up with a recipe to fulfill them. On the other list, of course. ;-) Cheers, Moritz _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
