Hi Folks, I often record films on TV using "TV Headend" and use ffmpeg (h.264 with -crf18) do compress the videos to better file sizes for permanent storage. Source is a public service TV channel, permanentely transmitting in 720p50. The recorded files are *.ts files in 720p50, video is aac / h.264 encoded.
Now, some newer films have true 50 frames per second, so that's okay. Some older films, esp. filmed on chemical film stock and hires-scanned to video, have effectively 25 true *different* frames per second, allthough the video stream is still in 50 fps. These videos save file size, if I can re-code them with only 25 fps, thus throwing away the 25 redundant "filler" frames. I would like to have a generic re-coding engine, where I just drop the files and the script analyzes the file and calls ffmpeg with the needed options. Currently I watch a part of each film frame by frame, and if I see changes in only every second frame, I add the option "-framerate 25" th the ffmpeg call. So: Is there a generic filter option in ffmpeg, to say: "Transcode 50p stream with 50 different fps and keep 50 fps, while in 50p stream with 25 different is downgraded to 25 fps video."? Or is there a way for ffprobe to tell me, if the video has effectively 25 or 50 fps, even if the video stream is allways in p50? In this way, I could first determine the real fps and include an option "-framerate 25" in the following ffmpeg call, if needed. Regards, Mattias _______________________________________________ ffmpeg-user mailing list email@example.com http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".