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  • Why the audio of my mp4 file is going out of async

    16 juillet 2018, par Dop

    I am having a problem converting a wmv file to mp4. I am using x264.exe this command to get the video stream

    x264 --output temporal.264 --fps 25 --preset slow --bitrate 2048 --vbv-maxrate 2048 --vbv-bufsize 9600 --min-keyint 48 --keyint 48 --scenecut 0 --no-scenecut --pass 1 --video-filter "resize:width=640,height=480" Original.wmv

    Then I use ffmpeg.exe to extract the audio stream with this line :

    ffmpeg -i .wmv -acodec libfdk_aac -b:a 32000 temporal.aac

    finally I use MP4Box to merges each stream with this line :

    MP4Box -add temporal.264 Final.mp4
    MP4Box -add temporal.aac Final.mp4

    The problem is that the final.mp4 audio is out of sync. It starts good but with time it goes out of sync with time.

    I run this command :

    MP4Box -info 010004470063PE-10022017083824-2_MultiMedia--1.mp4

    and I discover that the estimated time of both streams are different :

    output of command

    * Movie Info *
           Timescale 600 - 2 tracks
           Computed Duration 01:00:03.643 - Indicated Duration 01:00:03.643
           Fragmented File: no
           File suitable for progressive download (moov before mdat)
           File Brand isom - version 1
                   Compatible brands: isom avc1
           Created: GMT Wed Jun 27 16:31:44 2018
           Modified: GMT Wed Jun 27 16:31:44 2018
    File has root IOD (9 bytes)
    Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
    Visual PL: AVC/H264 Profile (0x7f)
    Audio PL: AAC Profile @ Level 2 (0x29)
    No streams included in root OD
    Track # 1 Info - TrackID 1 - TimeScale 25000
    Media Duration 00:59:57.520 - Indicated Duration 00:59:57.520
    Track has 1 edit lists: track duration is 00:59:57.320
    Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 89938 samples
    Visual Track layout: x=0 y=0 width=640 height=480
    MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
    AVC/H264 Video - Visual Size 640 x 480
           AVC Info: 1 SPS - 1 PPS - Profile Main @ Level 3
           NAL Unit length bits: 32
           Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
           SPS#1 hash: 41EE779BEF2AA71A7131EAFD3C77C7E3BC95FD8E
           PPS#1 hash: 086E1D72A40A0E8CF35D102F34A9DF6CD44D6CEF
    Self-synchronized
           RFC6381 Codec Parameters: avc1.4D401E
           Average GOP length: 250 samples
    Track # 2 Info - TrackID 2 - TimeScale 44100
    Media Duration 01:00:03.644 - Indicated Duration 01:00:03.644
    Media Info: Language "Undetermined (und)" - Type "soun:mp4a" - 155196 samples
    MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
    MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 44100
    Synchronized on stream 1
           RFC6381 Codec Parameters: mp4a.40.2
           All samples are sync

    I am not shore why this is happening, becar the original wmv is perfectly synchronize. Any help ?

  • ffmpeg hls video recording timing inforamtion is inaccurate

    27 juin 2018, par Haris

    I am recording the rtsp stream in HLS format which is working fine with below command.

    ~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8

    But when I check the the duration of each ts file with live.m3u8 file content the value is not accurate.

    Here is the live.m3u8

    #EXTM3U
    
#EXT-X-VERSION:3
    
#EXT-X-TARGETDURATION:2
    
#EXT-X-MEDIA-SEQUENCE:0
    
#EXTINF:2.000000,
    
live0.ts
    
#EXTINF:2.000000,
    
live1.ts
    
#EXTINF:1.200000,
    
live2.ts
    
#EXTINF:2.500000,
    
live3.ts
    
#EXTINF:2.000000,
    
live4.ts
    
#EXTINF:2.600000,
    
live5.ts
    
#EXTINF:1.700000,
    
live6.ts
    
#EXT-X-ENDLIST

    And when I check the timing information of the ts file live2.ts using the command,

      ~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"

    I am getting the value 2.136000 where as in m3u8 file it is 1.20000.

    I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.

    OS : Ubuntu 12.04

    ffmpeg Version

    $~/bin//ffmpeg -version
    

    

    
ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
    
built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
    
configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
    
libavutil      56. 18.102 / 56. 18.102
    
libavcodec     58. 20.104 / 58. 20.104
    
libavformat    58. 17.101 / 58. 17.101
    
libavdevice    58.  4.101 / 58.  4.101
    
libavfilter     7. 25.100 /  7. 25.100
    
libswscale      5.  2.100 /  5.  2.100
    
libswresample   3.  2.100 /  3.  2.100
    
libpostproc    55.  2.100 / 55.  2.100

    Note

    If I tested the same command in Ubuntu 16.04 where ffmpeg installed with apt-get every thing works fine.

    Here is the ffmpeg details

    $ ~/bin/ffmpeg -version
    
ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
    
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
libavutil      54. 31.100 / 54. 31.100
    
libavcodec     56. 60.100 / 56. 60.100
    
libavformat    56. 40.101 / 56. 40.101
    
libavdevice    56.  4.100 / 56.  4.100
    
libavfilter     5. 40.101 /  5. 40.101
    
libavresample   2.  1.  0 /  2.  1.  0
    
libswscale      3.  1.101 /  3.  1.101
    
libswresample   1.  2.101 /  1.  2.101
    
libpostproc    53.  3.100 / 53.  3.100

    What could be the cause, any help will be appreciated.

  • Why the audio of my mp4 file is going out of async

    16 juillet 2018, par Dop

    I am having a problem converting a wmv file to mp4. I am using x264.exe this command to get the video stream

    x264 --output temporal.264 --fps 25 --preset slow --bitrate 2048 --vbv-maxrate 2048 --vbv-bufsize 9600 --min-keyint 48 --keyint 48 --scenecut 0 --no-scenecut --pass 1 --video-filter "resize:width=640,height=480" Original.wmv

    Then I use ffmpeg.exe to extract the audio stream with this line :

    ffmpeg -i .wmv -acodec libfdk_aac -b:a 32000 temporal.aac

    finally I use MP4Box to merges each stream with this line :

    MP4Box -add temporal.264 Final.mp4
    MP4Box -add temporal.aac Final.mp4

    The problem is that the final.mp4 audio is out of sync. It starts good but with time it goes out of sync with time.

    I run this command :

    MP4Box -info 010004470063PE-10022017083824-2_MultiMedia--1.mp4

    and I discover that the estimated time of both streams are different :

    output of command

    * Movie Info *
           Timescale 600 - 2 tracks
           Computed Duration 01:00:03.643 - Indicated Duration 01:00:03.643
           Fragmented File: no
           File suitable for progressive download (moov before mdat)
           File Brand isom - version 1
                   Compatible brands: isom avc1
           Created: GMT Wed Jun 27 16:31:44 2018
           Modified: GMT Wed Jun 27 16:31:44 2018
    File has root IOD (9 bytes)
    Scene PL 0xff - Graphics PL 0xff - OD PL 0xff
    Visual PL: AVC/H264 Profile (0x7f)
    Audio PL: AAC Profile @ Level 2 (0x29)
    No streams included in root OD
    Track # 1 Info - TrackID 1 - TimeScale 25000
    Media Duration 00:59:57.520 - Indicated Duration 00:59:57.520
    Track has 1 edit lists: track duration is 00:59:57.320
    Media Info: Language "Undetermined (und)" - Type "vide:avc1" - 89938 samples
    Visual Track layout: x=0 y=0 width=640 height=480
    MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
    AVC/H264 Video - Visual Size 640 x 480
           AVC Info: 1 SPS - 1 PPS - Profile Main @ Level 3
           NAL Unit length bits: 32
           Chroma format YUV 4:2:0 - Luma bit depth 8 - chroma bit depth 8
           SPS#1 hash: 41EE779BEF2AA71A7131EAFD3C77C7E3BC95FD8E
           PPS#1 hash: 086E1D72A40A0E8CF35D102F34A9DF6CD44D6CEF
    Self-synchronized
           RFC6381 Codec Parameters: avc1.4D401E
           Average GOP length: 250 samples
    Track # 2 Info - TrackID 2 - TimeScale 44100
    Media Duration 01:00:03.644 - Indicated Duration 01:00:03.644
    Media Info: Language "Undetermined (und)" - Type "soun:mp4a" - 155196 samples
    MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
    MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 44100
    Synchronized on stream 1
           RFC6381 Codec Parameters: mp4a.40.2
           All samples are sync

    I am not shore why this is happening, becar the original wmv is perfectly synchronize. Any help ?

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