-hls_list_size 0 does not write playlist entries

[Christian Ebert]

Summary of the bug:
How to reproduce:

$ ffmpeg -i testhls.mp4 -bsf:v h264_mp4toannexb -c copy -map 0 -f hls -hls_list_size 0 testhls0.m3u8
ffmpeg version N-60230-gcfe282e Copyright (c) 2000-2014 the FFmpeg developers
  built on Jan 29 2014 14:17:03 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-network --disable-ffserver --enable-shared --enable-libfdk-aac --enable-libx264 --enable-libxvid --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --extra-cflags=-I/sw/include --extra-libs=-L/sw/lib
  libavutil      52. 63.100 / 52. 63.100
  libavcodec     55. 49.101 / 55. 49.101
  libavformat    55. 28.101 / 55. 28.101
  libavdevice    55.  7.100 / 55.  7.100
  libavfilter     4.  1.101 /  4.  1.101
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testhls.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.28.101
  Duration: 00:00:35.23, start: 0.229388, bitrate: 314 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 282 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Output #0, hls, to 'testhls0.m3u8':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf55.28.101
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 282 kb/s, 15 fps, 90k tbn, 15 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, 32 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[adts @ 0x7fb72883c000] Encoder did not produce proper pts, making some up.
frame=  524 fps=0.0 q=-1.0 Lsize=N/A time=00:00:35.29 bitrate=N/A
video:1203kB audio:138kB subtitle:0 global headers:0kB muxing overhead -100.001603%
$ cat testhls0.m3u8
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:0
#EXT-X-MEDIA-SEQUENCE:3
#EXT-X-ENDLIST

The segments are created, but the list is empty. However man ffmpeg-formats says:

hls_list_size size

Set the maximum number of playlist entries. If set to 0 the
list file will contain all the segments. Default value is 5.

Same behaviour with ffmpeg version N-60430-gc72f587.

[Carl Eugen Hoyos]

Should be fixed in 561bfce2