Wrong example on ffmpeg-filters 6.2 adelay

[Katie Holly]

Hi,

i studied the ​ffmpeg-filters page, especially the ​6.2 adelay part a few days ago and tried out the example... This is what i get and below is how it should be (fixed):

 fusl@thinkbook  ~   ffmpeg -loglevel debug -i testin.mp3 -af 'adelay=1000:1000' testout.mp3
ffmpeg version N-58852-g4dfc8f6 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec  7 2013 13:24:02 with gcc 4.8 (SUSE Linux)
  configuration: --enable-gpl --enable-libx264 --enable-libmp3lame --enable-nonfree --enable-libaacplus --enable-x11grab
  libavutil      52. 56.100 / 52. 56.100
  libavcodec     55. 45.100 / 55. 45.100
  libavformat    55. 22.100 / 55. 22.100
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 92.100 /  3. 92.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-i' ... matched as input file with argument 'testin.mp3'.
Reading option '-af' ... matched as option 'af' (set audio filters) with argument 'adelay=1000:1000'.
Reading option 'testout.mp3' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input file testin.mp3.
Successfully parsed a group of options.
Opening an input file: testin.mp3.
[mp3 @ 0x2270900] Format mp3 probed with size=2048 and score=51
[mp3 @ 0x2270900] id3v2 ver:4 flags:00 len:35
[mp3 @ 0x2270900] pad 576 0
[mp3 @ 0x2270900] Before avformat_find_stream_info() pos: 227 bytes read:32768 seeks:0
[mp3 @ 0x2270900] demuxer injecting skip 1105
[mp3 @ 0x2271840] skip 1105 samples due to side data
[mp3 @ 0x2271840] skip 1105/1152 samples
[mp3 @ 0x2270900] max_analyze_duration 5000000 reached at 5015510 microseconds
[mp3 @ 0x2270900] After avformat_find_stream_info() pos: 82147 bytes read:98304 seeks:0 frames:194
Input #0, mp3, from 'testin.mp3':
  Metadata:
    encoder         : Lavf55.22.100
  Duration: 00:00:10.00, start: 0.000000, bitrate: 128 kb/s
    Stream #0:0, 194, 1/14112000: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
Successfully opened the file.
Parsing a group of options: output file testout.mp3.
Applying option af (set audio filters) with argument adelay=1000:1000.
Successfully parsed a group of options.
Opening an output file: testout.mp3.
Successfully opened the file.
detected 2 logical cores
[Parsed_adelay_0 @ 0x2289c60] Setting 'delays' to value '1000'
[Parsed_adelay_0 @ 0x2289c60] No option name near '1000'
[AVFilterGraph @ 0x22b0fe0] Error initializing filter 'adelay' with args '1000:1000'
Error opening filters!
[AVIOContext @ 0x22b12c0] Statistics: 0 seeks, 0 writeouts
[AVIOContext @ 0x2278fc0] Statistics: 98304 bytes read, 0 seeks

Working (fixed example by changing ':' to '|'):

 fusl@thinkbook  ~   ffmpeg -loglevel debug -i testin.mp3 -af 'adelay=1000|1000' testout.mp3
ffmpeg version N-58852-g4dfc8f6 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec  7 2013 13:24:02 with gcc 4.8 (SUSE Linux)
  configuration: --enable-gpl --enable-libx264 --enable-libmp3lame --enable-nonfree --enable-libaacplus --enable-x11grab
  libavutil      52. 56.100 / 52. 56.100
  libavcodec     55. 45.100 / 55. 45.100
  libavformat    55. 22.100 / 55. 22.100
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 92.100 /  3. 92.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-i' ... matched as input file with argument 'testin.mp3'.
Reading option '-af' ... matched as option 'af' (set audio filters) with argument 'adelay=1000|1000'.
Reading option 'testout.mp3' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input file testin.mp3.
Successfully parsed a group of options.
Opening an input file: testin.mp3.
[mp3 @ 0x190b900] Format mp3 probed with size=2048 and score=51
[mp3 @ 0x190b900] id3v2 ver:4 flags:00 len:35
[mp3 @ 0x190b900] pad 576 0
[mp3 @ 0x190b900] Before avformat_find_stream_info() pos: 227 bytes read:32768 seeks:0
[mp3 @ 0x190b900] demuxer injecting skip 1105
[mp3 @ 0x190c840] skip 1105 samples due to side data
[mp3 @ 0x190c840] skip 1105/1152 samples
[mp3 @ 0x190b900] max_analyze_duration 5000000 reached at 5015510 microseconds
[mp3 @ 0x190b900] After avformat_find_stream_info() pos: 82147 bytes read:98304 seeks:0 frames:194
Input #0, mp3, from 'testin.mp3':
  Metadata:
    encoder         : Lavf55.22.100
  Duration: 00:00:10.00, start: 0.000000, bitrate: 128 kb/s
    Stream #0:0, 194, 1/14112000: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
Successfully opened the file.
Parsing a group of options: output file testout.mp3.
Applying option af (set audio filters) with argument adelay=1000|1000.
Successfully parsed a group of options.
Opening an output file: testout.mp3.
Successfully opened the file.
detected 2 logical cores
[Parsed_adelay_0 @ 0x1924c60] Setting 'delays' to value '1000|1000'
[graph 0 input from stream 0:0 @ 0x1925300] Setting 'time_base' to value '1/44100'
[graph 0 input from stream 0:0 @ 0x1925300] Setting 'sample_rate' to value '44100'
[graph 0 input from stream 0:0 @ 0x1925300] Setting 'sample_fmt' to value 's16p'
[graph 0 input from stream 0:0 @ 0x1925300] Setting 'channel_layout' to value '0x3'
[graph 0 input from stream 0:0 @ 0x1925300] tb:1/44100 samplefmt:s16p samplerate:44100 chlayout:0x3
[audio format for output stream 0:0 @ 0x1925ac0] Setting 'sample_fmts' to value 's32p|fltp|s16p'
[audio format for output stream 0:0 @ 0x1925ac0] Setting 'sample_rates' to value '44100|48000|32000|22050|24000|16000|11025|12000|8000'
[audio format for output stream 0:0 @ 0x1925ac0] Setting 'channel_layouts' to value '0x4|0x3'
[AVFilterGraph @ 0x194bfe0] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
Output #0, mp3, to 'testout.mp3':
  Metadata:
    TSSE            : Lavf55.22.100
    Stream #0:0, 0, 1/90000: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p
Stream mapping:
  Stream #0:0 -> #0:0 (mp3 -> libmp3lame)
Press [q] to stop, [?] for help
[mp3 @ 0x190c840] skip 1105 samples due to side data
[mp3 @ 0x190c840] skip 1105/1152 samples
[output stream 0:0 @ 0x1925be0] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
[libmp3lame @ 0x191c0c0] Trying to remove 828 more samples than there are in the queue
size=     172kB time=00:00:11.02 bitrate= 128.2kbits/s    
video:0kB audio:172kB subtitle:0 global headers:0kB muxing overhead 0.128701%
383 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x194c2c0] Statistics: 2 seeks, 424 writeouts
[AVIOContext @ 0x1913fc0] Statistics: 160305 bytes read, 0 seeks

So, it's just the example adelay=1500:0:500 which confused me and could confuse other users also. Fixing the example could also save lifes where developers could very quickly become angry, when something which should work does not work. :)

[Carl Eugen Hoyos]

Should be fixed.