I have a strange problem:
I convert mp4 source file using command
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/Applications/VLC.app/Contents/MacOS/VLC -I dummy /home/uznick/H264_test5_voice_mp4_480x360.mp4 vlc://quit --sout "#transcode{vb=5000,ab=160,vcodec=h264,height=1080,channels=2,width=1920,samplerate=48000,acodec=aac}:std{access=file{no-overwrite},mux=mp4,dst='/home/uznick/test.mp4'}" --sout-avcodec-strict=-2 -vvv
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avconv -y -loglevel error -i /home/uznick/test.mp4 -codec copy /home/uznick/test.mp4.flv
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[h264 @ 0x7fdd8a819a00] A non-intra slice in an IDR NAL unit.
[h264 @ 0x7fdd8a819a00] decode_slice_header error
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ffprobe /home/uznick/test.mp4
ffprobe version 2.4.3 Copyright (c) 2007-2014 the FFmpeg developers
built on Nov 7 2014 18:39:07 with Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.4.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
[h264 @ 0x7ffd73807e00] A non-intra slice in an IDR NAL unit.
[h264 @ 0x7ffd73807e00] decode_slice_header error
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/uznick/test.mp4':
Metadata:
major_brand : isom
minor_version : 0
compatible_brands: mp41avc1qt
creation_time : 2014-11-17 09:15:03
encoder : vlc 2.1.5 stream output
encoder-eng : vlc 2.1.5 stream output
Duration: 00:00:04.83, start: 0.000000, bitrate: 1759 kb/s
Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 126 kb/s (default)
Metadata:
creation_time : 2014-11-17 09:15:03
handler_name : SoundHandler
Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 57:128 DAR 19:24], 1663 kb/s, 30 fps, 30 tbr, 1000k tbn, 60 tbc (default)
Metadata:
creation_time : 2014-11-17 09:15:03
handler_name : VideoHandler