Hello, For few months, I have an issue when I record sound on my Linux fedora 22 desktop. I never got the fix but now I need it to be fixed, so here I am:
Hardware and software: Motherboard ASRock 970 Extreme4 CPU AMD FX-8120 Eight-Core Processor Fedora 22 ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers built with gcc 5.1.1 (GCC) 20150422 (Red Hat 5.1.1-1) configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect libavutil 54. 20.100 / 54. 20.100 libavcodec 56. 26.100 / 56. 26.100 libavformat 56. 25.101 / 56. 25.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 11.102 / 5. 11.102 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 The problem: When I record with ffmpeg a sound from the Line in, I get statics just after every sound impulsion. I have a mp3 file with "bip" every second playing from a mp3 player connected to Line in. Command Line is: ffmpeg -debug 1 -vn -f alsa -ac 2 -channel_layout stereo -i hw:0,0 -c:a pcm_s16le /Store3/Test/pcm_`date +%m%d_%H%M`.wav Same issue with ffplay: ffplay -debug 1 -f alsa -ac 2 -i hw:0,0 Statics after almost every bip Same issue with VLC (input hw:0,0),statics after every bip. When I record and play with Audacity with Alsa, Recording device: default then pulse then ALC892 (hw:0,0), sound is perfect. When I record with gnome-sound-recorder 3.16.0-1.fc22, format flac, ogg, sound is perfect. When I record with arecord, CL: arecord -f cd -t wav out.wav, sound is perfect. Something strange I noticed: I start the player, then I run command ffmpeg. After few seconds, music is playing, I stop ffmpeg (type q) then I stop the player.(first file) Then I run again ffmpeg (no music, no sound is playing), I wait few seconds then I stop ffmpeg.(second file) When I listen the first file, I have music with distortion/statics then stop suddenly.(OK) The I listen the second file (the second file should be only silence but here is the most important): I can listen at the beginning around 1 full second of the end of the previous recording with a lot of distortion/statics. Looks like there is a recording memory overflow. I have tried to adjust all the levels and can say for sure this is not an over-level saturation issue. When I listen directly from line in, sound is perfect. I don't know what to do more. Let me know a site to upload an audio file if you want a sample of the issue. Let me know any info you need to help me to get rid of this annoying problem. Many thanks for your help _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
