[FFmpeg-devel] (no subject)

[Thierry Foucu]

Please find attached new patch. I tried it against ticket 2674 and it seems to work
Here are the output:

For the up-sample, getting 48 frames out, instead of 47
------------------------------
./ffmpeg -loglevel verbose -i 24fps.avi -vf fps=48 -y 48fps.avi
ffmpeg version N-87234-g9a32769f5e Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: 
  libavutil      55. 74.100 / 55. 74.100
  libavcodec     57.105.100 / 57.105.100
  libavformat    57. 81.100 / 57. 81.100
  libavdevice    57.  8.100 / 57.  8.100
  libavfilter     6.103.100 /  6.103.100
  libswscale      4.  7.103 /  4.  7.103
  libswresample   2.  8.100 /  2.  8.100
Input #0, avi, from '24fps.avi':
  Metadata:
    encoder         : Lavf57.81.100
  Duration: 00:00:01.00, start: 0.000000, bitrate: 368 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile), 1 reference frame (FMP4 / 0x34504D46), yuv420p(left), 320x240 [SAR 1:1 DAR 4:3], 24 fps, 24 tbr, 24 tbn, 24 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[Parsed_fps_0 @ 0x34ea4a0] fps=48/1
[graph 0 input from stream 0:0 @ 0x365ca20] w:320 h:240 pixfmt:yuv420p tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
Output #0, avi, to '48fps.avi':
  Metadata:
    ISFT            : Lavf57.81.100
    Stream #0:0: Video: mpeg4, 1 reference frame (FMP4 / 0x34504D46), yuv420p(left), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 48 fps, 48 tbn, 48 tbc
    Metadata:
      encoder         : Lavc57.105.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
No more output streams to write to, finishing.
frame=   48 fps=0.0 q=2.0 Lsize=      67kB time=00:00:01.00 bitrate= 552.9kbits/s speed=28.2x    
video:61kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 11.158647%
Input file #0 (24fps.avi):
  Input stream #0:0 (video): 24 packets read (39693 bytes); 24 frames decoded; 
  Total: 24 packets (39693 bytes) demuxed
Output file #0 (48fps.avi):
  Output stream #0:0 (video): 48 frames encoded; 48 packets muxed (62176 bytes); 
  Total: 48 packets (62176 bytes) muxed
[Parsed_fps_0 @ 0x34ea4a0] 24 frames in, 48 frames out; 0 frames dropped, 23 frames duplicated.
------------------------------


For down-sample, getting 12 frames out instead of 13
-----------------------------
./ffmpeg -loglevel verbose -i 24fps.avi -vf fps=12 -y 12fps.avi
ffmpeg version N-87234-g9a32769f5e Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: 
  libavutil      55. 74.100 / 55. 74.100
  libavcodec     57.105.100 / 57.105.100
  libavformat    57. 81.100 / 57. 81.100
  libavdevice    57.  8.100 / 57.  8.100
  libavfilter     6.103.100 /  6.103.100
  libswscale      4.  7.103 /  4.  7.103
  libswresample   2.  8.100 /  2.  8.100
Input #0, avi, from '24fps.avi':
  Metadata:
    encoder         : Lavf57.81.100
  Duration: 00:00:01.00, start: 0.000000, bitrate: 368 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile), 1 reference frame (FMP4 / 0x34504D46), yuv420p(left), 320x240 [SAR 1:1 DAR 4:3], 24 fps, 24 tbr, 24 tbn, 24 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
[Parsed_fps_0 @ 0x304e4a0] fps=12/1
[graph 0 input from stream 0:0 @ 0x31c0aa0] w:320 h:240 pixfmt:yuv420p tb:1/24 fr:24/1 sar:1/1 sws_param:flags=2
Output #0, avi, to '12fps.avi':
  Metadata:
    ISFT            : Lavf57.81.100
    Stream #0:0: Video: mpeg4, 1 reference frame (FMP4 / 0x34504D46), yuv420p(left), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 12 fps, 12 tbn, 12 tbc
    Metadata:
      encoder         : Lavc57.105.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
No more output streams to write to, finishing.
frame=   12 fps=0.0 q=2.0 Lsize=      26kB time=00:00:01.00 bitrate= 211.3kbits/s speed=39.8x    
video:20kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 29.731853%
Input file #0 (24fps.avi):
  Input stream #0:0 (video): 24 packets read (39693 bytes); 24 frames decoded; 
  Total: 24 packets (39693 bytes) demuxed
Output file #0 (12fps.avi):
  Output stream #0:0 (video): 12 frames encoded; 12 packets muxed (20362 bytes); 
  Total: 12 packets (20362 bytes) muxed
[Parsed_fps_0 @ 0x304e4a0] 24 frames in, 12 frames out; 12 frames dropped, 0 frames duplicated.