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Sur d’autres sites (5928)

  • Node.js Webm live stream server : issues with tag

    10 décembre 2013, par breathe0

    I'm using Node.js as stream server to stream realtime Webm videos that is sent by FFMPEG (executed from another application, the stream is done via HTTP) and received by a webapp that uses the tag.

    This is what I'm doing : FFMPEG streams the received frames using the following command :

    ffmpeg -r 30 -f rawvideo  -pix_fmt bgra -s 640x480 
    
-i \\.\pipe\STREAM_PIPE -r 60 
    
-f segment  -s 240x160 -codec:v libvpx  -f webm 
    
http://my.domain.com/video_stream.webm

    (the stream comes from an application that uses the Kinect as source and communicates with FFMPEG through a pipe, sending one frame after another)

    When the webapp connects, it receives immediately this response from the server :

    HTTP/1.1 200 OK
    
X-Powered-By: Express
    
content-type: video/webm
    
cache-control: private
    
connection: close
    
Date: Fri, 06 Dec 2013 14:36:31 GMT

    and a Webm header (previously stored on the server, with the same resolution and frame rate of the source stream and tested as working on VLC) is immediately appended. Then the webapp starts to receive the data streamed by FFMPEG. Here is a screenshot of Mkvinfo GUI showing the fields of the header :

    Header screenshot

    However, even if the Network tab of the Chrome console shows that there is an actual stream of data (meaning that what is streamed is not completely garbage, otherwise the connection would be dropped), the player doesn't display anything. We tried to manually prepend our header to the dumped video received by the webapp and VLC plays it just fine, but this is not happening with the tag.

    What can cause this problem ? Are we missing something about the encoding on the FFMPEG side or we stored wrong values on the header (or they're not enough) ?

    PS : I cannot rely on an extern stream server.

    PPS : We tried the following experiments :

    • substituting the video header with the one stored in the server makes the video playable on both vlc and video tag
    • if we dump the video that is already started (without an header) and we prepend the video header stored in the server or even its original header, the video is playable in VLC but not on the tag (we're carefully prepending the header just before the beggining of the cluster).

  • Q.For encoding error of ffmpeg

    21 mars 2016, par 社畜根性

    I ran the following command.

    ffmpeg -i test.mp4 -threads 2 -codec:v libx264 -s:v 1280x720 -aspect:v 16:9 -b:v 256k -map 0 -f segment -segment_format mpegts -segment_time 10 -segment_list stream.m3u8 streamfiles/stream%03d.ts

    Execution result

    ffmpeg version N-75926-gce0834b Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.6 (Debian 4.6.3-14+rpi1)
    
  configuration: --arch=armel --target-os=linux --enable-shared --enable-gpl --enable-libx264 --enable-nonfree
    
  libavutil      55.  3.100 / 55.  3.100
    
  libavcodec     57.  5.100 / 57.  5.100
    
  libavformat    57.  3.100 / 57.  3.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 11.100 /  6. 11.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.100 /  2.  0.100
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.40.100
    
  Duration: 00:00:03.28, start: 0.000000, bitrate: 10159 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 10156 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Illegal instruction

    The result is that an error occurred.
    Someone told me that it’s an error if you do not put the option to ./configure of libx264. That option is the --extra-cflags='-march=armv6' --extra-ldflags='-march=armv6'. Otherwise it would use the instruction of unsupported.

    So I ran ./configure with the option, then I ran the make and now I’m getting an error message :

    common/arm/quant-a.S: Assembler messages:
    
common/arm/quant-a.S:362: Error: selected processor does not support ARM mode `rbit r1,r1'
    
common/arm/quant-a.S:363: Error: selected processor does not support ARM mode `rbit r1,r1'
    
Makefile:217: recipe for target 'common/arm/quant-a.o' failed
    
make: *** [common/arm/quant-a.o] Error 1

    I do not know the meaning of this error. How should you deal me this error ?

    I use the machine is Raspberry PI B+ and my OS is Raspbian. I want to use ffmpeg and libx264.

    Any advice and suggestions will be greatly appreciated.

  • Q.For encoding error of ffmpeg

    21 mars 2016, par 社畜根性

    I ran the following command.

    ffmpeg -i test.mp4 -threads 2 -codec:v libx264 -s:v 1280x720 -aspect:v 16:9 -b:v 256k -map 0 -f segment -segment_format mpegts -segment_time 10 -segment_list stream.m3u8 streamfiles/stream%03d.ts

    Execution result

    ffmpeg version N-75926-gce0834b Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.6 (Debian 4.6.3-14+rpi1)
    
  configuration: --arch=armel --target-os=linux --enable-shared --enable-gpl --enable-libx264 --enable-nonfree
    
  libavutil      55.  3.100 / 55.  3.100
    
  libavcodec     57.  5.100 / 57.  5.100
    
  libavformat    57.  3.100 / 57.  3.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 11.100 /  6. 11.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.100 /  2.  0.100
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.40.100
    
  Duration: 00:00:03.28, start: 0.000000, bitrate: 10159 kb/s
    
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 10156 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
Illegal instruction

    The result is that an error occurred.
    Someone told me that it’s an error if you do not put the option to ./configure of libx264. That option is the --extra-cflags='-march=armv6' --extra-ldflags='-march=armv6'. Otherwise it would use the instruction of unsupported.

    So I ran ./configure with the option, then I ran the make and now I’m getting an error message :

    common/arm/quant-a.S: Assembler messages:
    
common/arm/quant-a.S:362: Error: selected processor does not support ARM mode `rbit r1,r1'
    
common/arm/quant-a.S:363: Error: selected processor does not support ARM mode `rbit r1,r1'
    
Makefile:217: recipe for target 'common/arm/quant-a.o' failed
    
make: *** [common/arm/quant-a.o] Error 1

    I do not know the meaning of this error. How should you deal me this error ?

    I use the machine is Raspberry PI B+ and my OS is Raspbian. I want to use ffmpeg and libx264.

    Any advice and suggestions will be greatly appreciated.

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