On 9/15/22, Bruchez Olivier via ffmpeg-user <[email protected]> wrote: > Hi all, > > I have a 10-bit 4:2:2 (yuv422p10le) AVI file containing only a video > stream: > > Input #0, avi, from 'test.avi': > Duration: 01:28:00.80, start: 0.000000, bitrate: 221185 kb/s > Stream #0:0: Video: v210 (v210 / 0x30313276), yuv422p10le, 720x576, 25 > fps, 25 tbr, 25 tbn, 25 tbc > > The file has a size of 146 GB = 146004770816 bytes. > > Am I correct to infer that those 10-bit YUV values are grouped into 30-bit > packets and encoded into 32-bit/4-byte packets? > > With 20 bits per pixel (Y + either U or V), that would give a theoretical > file size of: > > 88 * 60 * 25 * 720 * 576 * (10 + 10) / 30 * 32 / 8 = 145981440000 bytes > > Which seems to more or less match the original file size. > > Now here's my problem. When I extract the raw video stream: > > ffmpeg -i test.avi -c:v rawvideo -pix_fmt yuv422p10le -f rawvideo test.raw > > I get a RAW video file with a size of 96 GB = 96636395520 bytes. I’ve lost > one third of the video stream. > > Another strange thing: if I copy the video stream to another AVI file: > > ffmpeg -i test.avi -c copy test.copy.avi > > The resulting file has a size of 64 GB = 64425220302 bytes. This time I’ve > lost 56% of the video stream. > > What's happening here? It seems like I’m missing something obvious. >
Can not guess without access to the file in question. > Thanks for any help, > Olivier > _______________________________________________ > 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". > _______________________________________________ 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".
