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• Concatenating different rotated videos with ffmpeg

  14 avril 2017, par acilander

  I am trying to concatenate two videos with ffmpeg having different rotation metadata tags. The first one has rotation=180 the other one has no tag at all.

  There are two methods that can be used in ffmpeg : concat demuxer / concat protocol. Protocol is working as expected but demuxer method is not. When I use concat demuxer option in ffmpeg with copy option to avoid re-encoding the following happens :

  First video with rotation = 180 will be rotated correctly. But the second video without rotation flag will also be rotated and will be presented upside down in output video.

  I know about the options to remove rotation metadata or the possiblility to use filters to rotate the videos. But my question is if someone knows if this is expected behaviour of ffmpeg or not. For me it seems like ffmpeg uses rotation metadata from first video and uses it for all other concatenated videos. Is this assumption correct and intended ?

  Thank you for any feedback and explanations.

• Evolution #3524 : Sécurité : séparer les feuilles css compactées produites en https et http?

  5 août 2015, par nico d

  Il me semblait aussi que les urls sans protocole du type //www.domain.tld/css/style.css étaient une bonne solution mais je vois cette note de Paul Irish :

  Now that SSL is encouraged for everyone and doesn’t have performance concerns, this technique is now an anti-pattern. If the asset you need is available on SSL, then always use the https:// asset.
  Allowing the snippet to request over HTTP opens the door for attacks like the recent Github Man-on-the-side attack. It’s always safe to request HTTPS assets even if your site is on HTTP, however the reverse is not true.

  http://www.paulirish.com/2010/the-protocol-relative-url/

  Plus il me semble qu’il peut y avoir des bugs de double chargements de css sur IE7/8.

• when i built ffmpeg to push raspberry pi 4 camera stream to my sever,I get Unknown input format : 'h264' ERROR

  26 janvier 2021, par IOKE Bai

  input :

  


  


  raspivid -o - -t 0 -vf -hf -fps 10 -b 500000 | ffmpeg -re -ar 44100
-ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp ://111.111.111.111/live/stream

  


  


  output :

  


  


  


  ffmpeg version N-100793-gc7016e35a6 Copyright (c) 2000-2021
the FFmpeg developers
built with gcc 8 (Raspbian 8.3.0-6+rpi1)
configuration : —extra-ldflags=-latomic —enable-gpl —enable-version3 —enable-nonfree
—enable-static —disable-shared —prefix=/usr/local —disable-opencl —disable-thumb —disable-pic —disable-stripping
—enable-small —enable-ffmpeg —enable-ffplay —enable-ffprobe —disable-doc —disable-htmlpages —disable-podpages —disable-txtpages —disable-manpages —disable-everything —enable-libx264 —enable-encoder=libx264 —enable-encoder=h264
—enable-decoder=h264 —enable-decoder=pcm_s16le —enable-encoder=aac —enable-decoder=aac —enable-encoder=ac3 —enable-decoder=ac3 —enable-encoder=rawvideo —enable-decoder=rawvideo —enable-encoder=mjpeg —enable-decoder=mjpeg —enable-demuxer=concat —enable-muxer=flv —enable-demuxer=flv —enable-demuxer=live_flv —enable-muxer=hls —enable-muxer=segment —enable-muxer=stream_segment —enable-muxer=mov —enable-demuxer=mov —enable-muxer=mp4 —enable-muxer=mpegts —enable-demuxer=mpegts —enable-demuxer=mpegvideo —enable-muxer=matroska —enable-demuxer=matroska —enable-muxer=wav —enable-demuxer=wav —enable-muxer='pcm*' —enable-demuxer='pcm*' —enable-muxer=rawvideo —enable-demuxer=rawvideo —enable-muxer=rtsp —enable-demuxer=rtsp —enable-muxer=rtsp —enable-demuxer=sdp —enable-muxer=fifo —enable-muxer=tee —enable-parser=h264 —enable-parser=aac —enable-protocol=file —enable-protocol=tcp —enable-protocol=rtmp —enable-protocol=cache —enable-protocol=pipe —enable-filter=aresample —enable-filter=allyuv —enable-filter=scale —enable-libfreetype —enable-indev=v4l2 —enable-indev=alsa —enable-omx —enable-omx-rpi —enable-encoder=h264_omx —enable-mmal —enable-hwaccel=h264_mmal —enable-decoder=h264_mmal
libavutil 56. 63.101 / 56. 63.101
libavcodec 58.118.100 / 58.118.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7. 97.100 / 7. 97.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, s16le, from '/dev/zero' :
Duration : N/A, bitrate : 1411 kb/s
Stream #0:0 : Audio : pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

  


  


  


  ERROR

  


  


  Unknown input format : 'h264'