[FFmpeg-user] -ss before input improperly seeking?

[amindfv at mailbox.org]

Using git HEAD, here's the full output of using "-ss 0.333" which seeks much less than 0.333 seconds into the file:

$ ffmpeg -ss 0.333 -r 24 -i color-frames.mp4 -r 24 colorout4.mp4
ffmpeg version N-103385-g2589060b92 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Debian 10.2.1-6)
  configuration:
  libavutil      57.  4.101 / 57.  4.101
  libavcodec     59.  6.100 / 59.  6.100
  libavformat    59.  4.102 / 59.  4.102
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8.  4.100 /  8.  4.100
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'color-frames.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:00.79, start: 0.000000, bitrate: 172 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 159 kb/s, 24 fps, 24 tbr, 12288 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mp4, to 'colorout4.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.4.102
  Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 24 fps, 12288 tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.6.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.6.100 aac
frame=   18 fps=0.0 q=1.6 Lsize=     105kB time=00:00:00.70 bitrate=1208.8kbits/s speed=4.73x
video:103kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.690069%
[aac @ 0x55e2a63d51c0] Qavg: 65536.000



On Wed, Aug 25, 2021 at 06:11:33PM +0000, Carl Zwanzig wrote:
> On 8/25/2021 11:01 AM, amindfv--- via ffmpeg-user wrote:
> > Is this a bug?
> 
> Probably not, you're telling ffmpeg to do different things.
> 
> You're also missing the complete command output from each command.
> 
> z!
> 
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