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Out of sync VOD when streaming with wowza

Wowza Streaming Engine
#1

Hi,

I recorded a stream using wowza, playback works fine when streaming and using HLS.

This is the detail of the file.

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'streamrecorded_160p.mp4':
  Metadata:
    major_brand     : f4v 
    minor_version   : 0
    compatible_brands: isommp42m4v 
    creation_time   : 2016-03-26 11:23:54
  Duration: 01:05:49.20, start: 0.000000, bitrate: 254 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 284x160 [SAR 1:1 DAR 71:40], 158 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2016-03-26 11:23:54
      handler_name    : WowzaStreamingEngine
      encoder         : WowzaStreamingEngine
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      creation_time   : 2016-03-26 11:23:54
      handler_name    : WowzaStreamingEngine

Then I wanted to cut 22s out of this file, so I ran the following command:

ffmpeg -i streamrecorded_160p.mp4 -ss 00:00:22.0 -c copy tmp.mp4

Now the detail of tmp.mp4:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.28.102
  Duration: 01:05:27.15, start: 0.016000, bitrate: 256 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 284x160 [SAR 1:1 DAR 71:40], 158 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

This is working fine most of the time, however when I play this file using wowza, the audio is out of sync.

The file tmp.mp4 is playing correctly when using a standard player.

I suspect the problem is not with wowza but with the encoding of the file.

What could be wrong ?

#2

I have a similar problem and I am interested if it is related to yours.

Do you have the ffprobe utility? If so, can you provide the “show_streams” output for both streamrecorded_160p.mp4 and tmp.mp4?

ffprobe -show_streams file.mp4

I am specifically interested in your audio and video streams duration and start_time values.

#3

Hi patrice,

Unfortunately from a Wowza Support perspective we can’t offer direct support for ffmpeg and how it modifies files created by Wowza Streaming Engine. You may want to ask on an ffmpeg forum in this case.

Paul

#4

Output using ‘ffprobe’:

streamrecorded_160p.mp4

ffprobe version N-53555-g6b7ce0e-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 5.3.1 (Debian 5.3.1-11) 20160307
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libmfx --cc=gcc
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 28.103 / 57. 28.103
  libavformat    57. 28.102 / 57. 28.102
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 39.102 /  6. 39.102
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'streamrecorded_160p.mp4':
  Metadata:
    major_brand     : f4v 
    minor_version   : 0
    compatible_brands: isommp42m4v 
    creation_time   : 2016-03-26 11:23:54
  Duration: 01:05:49.20, start: 0.000000, bitrate: 254 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 284x160 [SAR 1:1 DAR 71:40], 158 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2016-03-26 11:23:54
      handler_name    : WowzaStreamingEngine
      encoder         : WowzaStreamingEngine
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      creation_time   : 2016-03-26 11:23:54
      handler_name    : WowzaStreamingEngine
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Baseline
codec_type=video
codec_time_base=1/50
codec_tag_string=avc1
codec_tag=0x31637661
width=284
height=160
coded_width=288
coded_height=160
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=71:40
pix_fmt=yuv420p
level=21
color_range=tv
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=left
timecode=N/A
refs=3
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/90000
start_pts=0
start_time=0.000000
duration_ts=355428000
duration=3949.200000
bit_rate=158668
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=98730
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=2016-03-26 11:23:54
TAG:language=eng
TAG:handler_name=WowzaStreamingEngine
TAG:encoder=WowzaStreamingEngine
[/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=1/90000
start_pts=0
start_time=0.000000
duration_ts=355424640
duration=3949.162667
bit_rate=93468
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=185117
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=2016-03-26 11:23:54
TAG:language=eng
TAG:handler_name=WowzaStreamingEngine
[/STREAM]

tmp.mp4

ffprobe version N-53555-g6b7ce0e-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2007-2016 the FFmpeg developers
  built with gcc 5.3.1 (Debian 5.3.1-11) 20160307
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --enable-frei0r --enable-libfribidi --disable-indev=sndio --disable-outdev=sndio --enable-librtmp --enable-libmfx --cc=gcc
  libavutil      55. 19.100 / 55. 19.100
  libavcodec     57. 28.103 / 57. 28.103
  libavformat    57. 28.102 / 57. 28.102
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 39.102 /  6. 39.102
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.28.102
  Duration: 01:05:27.15, start: 0.016000, bitrate: 256 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv), 284x160 [SAR 1:1 DAR 71:40], 158 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Baseline
codec_type=video
codec_time_base=1/50
codec_tag_string=avc1
codec_tag=0x31637661
width=284
height=160
coded_width=288
coded_height=160
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=71:40
pix_fmt=yuv420p
level=21
color_range=tv
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=left
timecode=N/A
refs=3
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/90000
start_pts=72000
start_time=0.800000
duration_ts=353376000
duration=3926.400000
bit_rate=158638
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=98160
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:language=eng
TAG:handler_name=VideoHandler
[/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=768
start_time=0.016000
duration_ts=188503040
duration=3927.146667
bit_rate=93468
max_bit_rate=93468
bits_per_raw_sample=N/A
nb_frames=184085
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:language=eng
TAG:handler_name=SoundHandler
[/STREAM]

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