$ ffmpeg -f h264 -i video.mp4 -vcodec copy -an video_out.mp4
[h264 @ 0x6e4b40] sps_id out of range
[h264 @ 0x6e4b40] non-existing PPS referenced
[h264 @ 0x6e4b40] sps_id out of range
[h264 @ 0x6e4b40] non-existing PPS 1 referenced
[h264 @ 0x6e4b40] decode_slice_header error
[h264 @ 0x6e4b40] no frame!
[h264 @ 0x6daa60] Estimating duration from bitrate, this may be inaccurate
Input #0, h264, from 'video.mp4':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: h264, 25 fps, 25 tbr, 1200k tbn, 2400k tbc
File 'video_out.mp4' already exists. Overwrite ? [y/N] y
Output #0, mp4, to 'video_out.mp4':
Output file #0 does not contain any stream