On Wed, Jul 17, 2019 at 17:20:24 +0200, Henning Thielemann wrote: > I tried this: > > $ ffmpeg -ss 00:02 -i 00078.MTS -vcodec copy -acodec ac3 -b:a 256k cut.mts > > However, cut.mts contains only audio, no video anymore: > > $ ffmpeg -i cut.mts
Usually, the output from the conversion command is much more interesting than only the inspection of the output. > Input #0, mpegts, from '/tmp/cut.mts': > Duration: 00:00:04.26, start: 1.400000, bitrate: 297 kb/s > Program 1 > Metadata: > service_name : Service01 > service_provider: FFmpeg > Stream #0:0[0x100]: Video: h264 ([27][0][0][0] / 0x001B), none, 90k tbr, > 90k tbn, 180k tbc > Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, > stereo, fltp, 256 kb/s The output does contain video and audio, according to this! Had you shown us the conversion command, we would have seen that 0 video frames are being copied: > frame= 0 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed= 0x > video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing > overhead: unknown I believe this may be due to your seek command "-ss 00:02". ffmpeg cannot find any keyframes starting from your given offset, and therefore can't begin the output stream, and produces 0 output frames. If you use the output option "-copyinkf", ffmpeg will copy the initial non-keyframes and actually produce 218 output frames. The output will probably be of little use without a single keyframe though. I guess this means you can't cut this video at this point with the copy codec. You need to reencode. > ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg > developers BTW, this is a very old version. That isn't the cause of your issue, but using a newer (newest!) version before reporting issues is recommended here. You can grab static binaries from here: https://johnvansickle.com/ffmpeg/ 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".
