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  • ffmpeg seek calculating wrong byte range ?

    17 décembre 2015, par user4455

    I’m running into an issue while trying to extract thumbnails from a movie file at a specific timestamp. Generally I’ve had no issues with this, but I’ve come across a set of movie files that are getting an error about the byte range requested (416 Requested Range Not Satisfiable).

    The odd thing is that the server is correctly returning the content length in the partial content request, yet when it requests the movie file it requests a length that exceeds that.

    This is a bit over my head, so I’m not sure what could be happening here. Any insight would be great.

    The Command :

    /usr/bin/ffmpeg -y -ss 1400 -i 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4' -qscale:v 2 -f image2 -vframes 1 -filter:v 'scale=192:108' -loglevel debug /data/www/storage/test.jpg 2>&1

    The Error :

    [https @ 0x22e1e00] header='HTTP/1.1 416 Requested Range Not Satisfiable'
    
[https @ 0x22e1e00] http_code=416
    
[https @ 0x22e1e00] HTTP error 416 Requested Range Not Satisfiable

    Source File Size :

    1776706045 bytes

    Source Content Duration :

    2897.624271

    Partial Content Request :

    [https @ 0x22e1e00] header='HTTP/1.1 206 Partial Content'
    
[https @ 0x22e1e00] http_code=206
    
[https @ 0x22e1e00] header='x-amz-id-2: 4J1pgHExIUA0GxIxSBmGJjrRqliHbsIjXeuGzVfTlaaoVXbyZI5FQNma8fGaifcovkXfxJev5yU='
    
[https @ 0x22e1e00] header='x-amz-request-id: 78B3BDBB0356EF40'
    
[https @ 0x22e1e00] header='Date: Wed, 16 Dec 2015 23:51:29 GMT'
    
[https @ 0x22e1e00] header='x-amz-meta-content-length: 2898'
    
[https @ 0x22e1e00] header='x-amz-meta-cb-modifiedtime: Tue, 15 Dec 2015 17:59:51 GMT'
    
[https @ 0x22e1e00] header='Last-Modified: Wed, 16 Dec 2015 23:44:59 GMT'
    
[https @ 0x22e1e00] header='ETag: "6341a8022630667a8070a83575e542e7-27"'
    
[https @ 0x22e1e00] header='Accept-Ranges: bytes'
    
[https @ 0x22e1e00] header='Content-Range: bytes 0-1776706044/1776706045'
    
[https @ 0x22e1e00] header='Content-Type: video/mp4'
    
[https @ 0x22e1e00] header='Content-Length: 1776706045'
    
[https @ 0x22e1e00] header='Server: AmazonS3'
    
[https @ 0x22e1e00] header='Connection: close'

    FFmpeg Request :

    request: GET /my-bucket/mymoviefile.mp4 HTTP/1.1
    
User-Agent: Lavf/56.25.101
    
Accept: */*
    
Range: bytes=1781732960-
    
Connection: close
    
Host: s3-us-west-2.amazonaws.com
    
Icy-MetaData: 1

    Entire Log :

    # /usr/bin/ffmpeg -y -ss 1400 -i 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4' -qscale:v 2 -f image2 -vframes 1 -filter:v 'scale=192:108' -loglevel debug /data/www/storage/test.jpg 2>&1
    
ffmpeg version 2.6.4 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Debian 4.9.2-10)
    
  configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
    
  libavutil      54. 20.100 / 54. 20.100
    
  libavcodec     56. 26.100 / 56. 26.100
    
  libavformat    56. 25.101 / 56. 25.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 11.102 /  5. 11.102
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Splitting the commandline.
    
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
    
Reading option '-ss' ... matched as option 'ss' (set the start time offset) with argument '1400'.
    
Reading option '-i' ... matched as input file with argument 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4'.
    
Reading option '-qscale:v' ... matched as option 'qscale' (use fixed quality scale (VBR)) with argument '2'.
    
Reading option '-f' ... matched as option 'f' (force format) with argument 'image2'.
    
Reading option '-vframes' ... matched as option 'vframes' (set the number of video frames to output) with argument '1'.
    
Reading option '-filter:v' ... matched as option 'filter' (set stream filtergraph) with argument 'scale=192:108'.
    
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
    
Reading option '/data/www/storage/test.jpg' ... matched as output file.
    
Finished splitting the commandline.
    
Parsing a group of options: global .
    
Applying option y (overwrite output files) with argument 1.
    
Applying option loglevel (set logging level) with argument debug.
    
Successfully parsed a group of options.
    
Parsing a group of options: input file https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4.
    
Applying option ss (set the start time offset) with argument 1400.
    
Successfully parsed a group of options.
    
Opening an input file: https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4.
    
[https @ 0x22e1e00] request: GET /my-bucket/mymoviefile.mp4 HTTP/1.1
    
User-Agent: Lavf/56.25.101
    
Accept: */*
    
Range: bytes=0-
    
Connection: close
    
Host: s3-us-west-2.amazonaws.com
    
Icy-MetaData: 1
    

    

    
[https @ 0x22e1e00] header='HTTP/1.1 206 Partial Content'
    
[https @ 0x22e1e00] http_code=206
    
[https @ 0x22e1e00] header='x-amz-id-2: 4J1pgHExIUA0GxIxSBmGJjrRqliHbsIjXeuGzVfTlaaoVXbyZI5FQNma8fGaifcovkXfxJev5yU='
    
[https @ 0x22e1e00] header='x-amz-request-id: 78B3BDBB0356EF40'
    
[https @ 0x22e1e00] header='Date: Wed, 16 Dec 2015 23:51:29 GMT'
    
[https @ 0x22e1e00] header='x-amz-meta-content-length: 2898'
    
[https @ 0x22e1e00] header='x-amz-meta-cb-modifiedtime: Tue, 15 Dec 2015 17:59:51 GMT'
    
[https @ 0x22e1e00] header='Last-Modified: Wed, 16 Dec 2015 23:44:59 GMT'
    
[https @ 0x22e1e00] header='ETag: "6341a8022630667a8070a83575e542e7-27"'
    
[https @ 0x22e1e00] header='Accept-Ranges: bytes'
    
[https @ 0x22e1e00] header='Content-Range: bytes 0-1776706044/1776706045'
    
[https @ 0x22e1e00] header='Content-Type: video/mp4'
    
[https @ 0x22e1e00] header='Content-Length: 1776706045'
    
[https @ 0x22e1e00] header='Server: AmazonS3'
    
[https @ 0x22e1e00] header='Connection: close'
    
[https @ 0x22e1e00] header=''
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] ISO: File Type Major Brand: mp42
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] Before avformat_find_stream_info() pos: 1647960 bytes read:1652200 seeks:0
    
[h264 @ 0x22e92c0] no picture
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] All info found
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] After avformat_find_stream_info() pos: 1862326 bytes read:1878504 seeks:0 frames:16
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 1
    
    compatible_brands: isommp41avc1
    
    creation_time   : 2015-11-18 02:34:41
    
  Duration: 00:48:17.70, start: 0.000000, bitrate: 4905 kb/s
    
    Stream #0:0(und), 15, 1/2997: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, left), 1920x1080 (1920x1088) [SAR 1:1 DAR 16:9], 1001/60000, 9994 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 59.94 tbc (default)
    
    Metadata:
    
      creation_time   : 2015-11-18 02:34:41
    
      handler_name    : ?Apple Video Media Handler
    
    Stream #0:1(und), 1, 1/48000: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
    
    Metadata:
    
      creation_time   : 2015-11-18 02:34:41
    
      handler_name    : ?Apple Sound Media Handler
    
Successfully opened the file.
    
Parsing a group of options: output file /data/www/storage/test.jpg.
    
Applying option qscale:v (use fixed quality scale (VBR)) with argument 2.
    
Applying option f (force format) with argument image2.
    
Applying option vframes (set the number of video frames to output) with argument 1.
    
Applying option filter:v (set stream filtergraph) with argument scale=192:108.
    
Successfully parsed a group of options.
    
Opening an output file: /data/www/storage/test.jpg.
    
Successfully opened the file.
    
detected 2 logical cores
    
[Parsed_scale_0 @ 0x22cd4c0] Setting 'w' to value '192'
    
[Parsed_scale_0 @ 0x22cd4c0] Setting 'h' to value '108'
    
[Parsed_scale_0 @ 0x22cd4c0] Setting 'flags' to value '0x4'
    
[Parsed_scale_0 @ 0x22cd4c0] w:192 h:108 flags:'0x4' interl:0
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'video_size' to value '1920x1080'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'pix_fmt' to value '0'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'time_base' to value '1/2997'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'pixel_aspect' to value '1/1'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'sws_param' to value 'flags=2'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] Setting 'frame_rate' to value '2997/100'
    
[graph 0 input from stream 0:0 @ 0x22ccfe0] w:1920 h:1080 pixfmt:yuv420p tb:1/2997 fr:2997/100 sar:1/1 sws_param:flags=2
    
[format @ 0x2798640] compat: called with args=[yuvj420p|yuvj422p|yuvj444p]
    
[format @ 0x2798640] Setting 'pix_fmts' to value 'yuvj420p|yuvj422p|yuvj444p'
    
[AVFilterGraph @ 0x22cda60] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
    
[Parsed_scale_0 @ 0x22cd4c0] picking yuvj420p out of 3 ref:yuv420p alpha:0
    
[swscaler @ 0x22c3c80] deprecated pixel format used, make sure you did set range correctly
    
[Parsed_scale_0 @ 0x22cd4c0] w:1920 h:1080 fmt:yuv420p sar:1/1 -> w:192 h:108 fmt:yuvj420p sar:1/1 flags:0x4
    
[mjpeg @ 0x2854e20] intra_quant_bias = 96 inter_quant_bias = 0
    
[mjpeg @ 0x28716c0] intra_quant_bias = 96 inter_quant_bias = 0
    
[mjpeg @ 0x2795320] intra_quant_bias = 96 inter_quant_bias = 0
    
Output #0, image2, to '/data/www/storage/test.jpg':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 1
    
    compatible_brands: isommp41avc1
    
    encoder         : Lavf56.25.101
    
    Stream #0:0(und), 0, 100/2997: Video: mjpeg, yuvj420p(pc, left), 192x108 [SAR 1:1 DAR 16:9], 100/2997, q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
    
    Metadata:
    
      creation_time   : 2015-11-18 02:34:41
    
      handler_name    : ?Apple Video Media Handler
    
      encoder         : Lavc56.26.100 mjpeg
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    
[https @ 0x22e1e00] request: GET /my-bucket/mymoviefile.mp4 HTTP/1.1
    
User-Agent: Lavf/56.25.101
    
Accept: */*
    
Range: bytes=1781732960-
    
Connection: close
    
Host: s3-us-west-2.amazonaws.com
    
Icy-MetaData: 1
    

    

    
[https @ 0x22e1e00] header='HTTP/1.1 416 Requested Range Not Satisfiable'
    
[https @ 0x22e1e00] http_code=416
    
[https @ 0x22e1e00] HTTP error 416 Requested Range Not Satisfiable
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x22e1740] stream 0, offset 0x6a331660: partial file
    
https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4: Invalid data found when processing input
    
[output stream 0:0 @ 0x22d7500] EOF on sink link output stream 0:0:default.
    
No more output streams to write to, finishing.
    
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A
    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    
Input file #0 (https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4):
    
  Input stream #0:0 (video): 0 packets read (0 bytes); 0 frames decoded;
    
  Input stream #0:1 (audio): 0 packets read (0 bytes);
    
  Total: 0 packets (0 bytes) demuxed
    
Output file #0 (/data/www/storage/test.jpg):
    
  Output stream #0:0 (video): 0 frames encoded; 0 packets muxed (0 bytes);
    
  Total: 0 packets (0 bytes) muxed
    
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
    
0 frames successfully decoded, 0 decoding errors
    
[AVIOContext @ 0x27ab100] Statistics: 1878504 bytes read, 0 seeks

    FFprobe Result :

    # /usr/bin/ffprobe -show_format -show_streams -i 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4'
    
ffprobe version 2.6.4 Copyright (c) 2007-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Debian 4.9.2-10)
    
  configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
    
  libavutil      54. 20.100 / 54. 20.100
    
  libavcodec     56. 26.100 / 56. 26.100
    
  libavformat    56. 25.101 / 56. 25.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 11.102 /  5. 11.102
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 1
    
    compatible_brands: isommp41avc1
    
    creation_time   : 2015-11-18 02:34:41
    
  Duration: 00:48:17.70, start: 0.000000, bitrate: 4905 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], 9994 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 59.94 tbc (default)
    
    Metadata:
    
      creation_time   : 2015-11-18 02:34:41
    
      handler_name    : ?Apple Video Media Handler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
    
    Metadata:
    
      creation_time   : 2015-11-18 02:34:41
    
      handler_name    : ?Apple Sound Media Handler
    
[STREAM]
    
index=0
    
codec_name=h264
    
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
    
profile=High
    
codec_type=video
    
codec_time_base=1001/60000
    
codec_tag_string=avc1
    
codec_tag=0x31637661
    
width=1920
    
height=1080
    
has_b_frames=1
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=16:9
    
pix_fmt=yuv420p
    
level=40
    
color_range=tv
    
color_space=unknown
    
color_transfer=unknown
    
color_primaries=unknown
    
chroma_location=left
    
timecode=N/A
    
refs=3
    
is_avc=1
    
nal_length_size=4
    
id=N/A
    
r_frame_rate=2997/100
    
avg_frame_rate=2997/100
    
time_base=1/2997
    
start_pts=0
    
start_time=0.000000
    
duration_ts=8684300
    
duration=2897.664331
    
bit_rate=9994429
    
max_bit_rate=N/A
    
bits_per_raw_sample=8
    
nb_frames=86843
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=1
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0
    
TAG:creation_time=2015-11-18 02:34:41
    
TAG:language=und
    
TAG:handler_name=Apple Video Media Handler
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=aac
    
codec_long_name=AAC (Advanced Audio Coding)
    
profile=LC
    
codec_type=audio
    
codec_time_base=1/48000
    
codec_tag_string=mp4a
    
codec_tag=0x6134706d
    
sample_fmt=fltp
    
sample_rate=48000
    
channels=2
    
channel_layout=stereo
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/48000
    
start_pts=0
    
start_time=0.000000
    
duration_ts=139085965
    
duration=2897.624271
    
bit_rate=192002
    
max_bit_rate=N/A
    
bits_per_raw_sample=N/A
    
nb_frames=135828
    
nb_read_frames=N/A
    
nb_read_packets=N/A
    
DISPOSITION:default=1
    
DISPOSITION:dub=0
    
DISPOSITION:original=0
    
DISPOSITION:comment=0
    
DISPOSITION:lyrics=0
    
DISPOSITION:karaoke=0
    
DISPOSITION:forced=0
    
DISPOSITION:hearing_impaired=0
    
DISPOSITION:visual_impaired=0
    
DISPOSITION:clean_effects=0
    
DISPOSITION:attached_pic=0
    
TAG:creation_time=2015-11-18 02:34:41
    
TAG:language=und
    
TAG:handler_name=Apple Sound Media Handler
    
[/STREAM]
    
[FORMAT]
    
filename=https://s3-us-west-2.amazonaws.com/my-bucket/mymoviefile.mp4
    
nb_streams=2
    
nb_programs=0
    
format_name=mov,mp4,m4a,3gp,3g2,mj2
    
format_long_name=QuickTime / MOV
    
start_time=0.000000
    
duration=2897.695000
    
size=1776706045
    
bit_rate=4905156
    
probe_score=100
    
TAG:major_brand=mp42
    
TAG:minor_version=1
    
TAG:compatible_brands=isommp41avc1
    
TAG:creation_time=2015-11-18 02:34:41
    
[/FORMAT]

  • FFMPEG command issue

    18 février 2015, par user3521787

    I am having an issue with FFMPEG. To be exact I’m trying to generate a number of ’meaningful’ thumbnails from a video file.
    I have found this command on the internet :

    ffmpeg -ss 3 -i input.mp4 -vf "select=gt(scene\,0.4)" -frames:v 5 -vsync vfr fps=fps=1/600 out%02d.jpg

    Sadly it doesn’t work for me, as I’m getting :

    [NULL @ 0x86c2420] Unable to find a suitable output format for 'fps=fps=1/600'
    
fps=fps=1/600: Invalid argument

    I have tried including "fps=fps=1/600" inside -vf, which resulted in only one picture being generated. What am I doing wrong ?

    EDIT :

    This is an example of a full output :

    $ ffmpeg -ss 3 -i video.ogg -vf "select=gt(scene\,0.4)" -frames:v 5 -vsync vfr fps=fps=1/600 out%02d.jpg
    
ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
    
  built on Jan 10 2015 23:26:13 with gcc 4.9.2 (GCC) 20141224 (prerelease)
    
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
    
  libavutil      54. 15.100 / 54. 15.100
    
  libavcodec     56. 13.100 / 56. 13.100
    
  libavformat    56. 15.102 / 56. 15.102
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  2.103 /  5.  2.103
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
[theora @ 0x9b59140] 7 bits left in packet 82
    
[ogg @ 0x9b586e0] Broken file, keyframe not correctly marked.
    
    Last message repeated 2 times
    
Input #0, ogg, from 'video.ogg':
    
  Duration: 00:09:56.46, start: 0.000000, bitrate: 2237 kb/s
    
    Stream #0:0: Video: theora, yuv420p, 854x480, 24 tbr, 24 tbn, 24 tbc
    
    Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp, 192 kb/s
    
[NULL @ 0x9b97660] Unable to find a suitable output format for 'fps=fps=1/600'
    
fps=fps=1/600: Invalid argument

  • Catalyst Open Source Academy

    16 janvier 2015, par Matthieu Aubry — Community

    The Open Source Academy is an initiative designed to provide training and work experience for young New Zealand technologists. Catalyst organises the Academy to show young technologists how to participate in open source communities and to fully explore their passion for IT through freely available open source tools.

    It has been running annually since 2011. We are proud that Piwik project could participate in the Academy again this year !

    What students got done

    It’s amazing what a few young students can get done in four days of participating in an open source project like Piwik ! They were able to quickly get started with Piwik, and continued to make useful contributions to the Piwik analytics platform.

    New Darkness theme

    Liam has created a new dark theme for Piwik called Darkness.

    Darkness theme

    To create the theme, Liam had to improve Piwik core stylesheets and created this pull request : Reuse the LESS variable for white color across all stylesheets.

    Accessibility improvements

    We were lucky to spend time with Julius, a Catalyst employee who is blind. He showed us in great detail how difficult and time consuming it can be for a blind user to use Piwik. For example we noticed how complicated it was for Julius to navigate the menus, to get to the main content, and to use the calendar and the Website selector. During this presentation we also noticed that Piwik was not yet usable with the keyboard.

    As a result of this session with Julius we got to work with the students to improve accessibility in Piwik.

    Accessibility session on Piwik

    (photo source)

    List of accessibility improvements

    All these pull requests were created by the students and have been successfully merged into Piwik :

    To learn more about accessibility in Piwik check out this issue on our tracker.

    Summary

    Working with young students was fun and interesting. We were excited to see how much they got done in such a short time !

    At Piwik and Piwik PRO we are committed to building the best open analytics platform, and we will continue to support students who want to take part in the Piwik adventure.

    Be well,

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