Hi please find the inline content below. > ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
This is a very old version, please consider using a recent one. (But this shouldn't be the issue.) > Input #1, alsa, from 'hw:0,1,0': > Duration: N/A, start: 1536642371.115637, bitrate: 1536 kb/s > Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s The input device at least works. > Output #0, mp4, to '/home/abhijit/test_1036.mp4': [...] > Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo, fltp, 128 kb/s ffmpeg's output file should contain a proper AAC stream. > The video file properties has some audio buffers but still no audio > on the speakers. Could it be that your ALSA capture device's recording is muted? > I don't know. How to ensure that? What does $ ffmpeg -i /home/abhijit/test_1036.mp4 -map 0:a -af volumedetect -f null - say, i.e. what is the actual volume? > abhijit@AHMCPU2092:~$ ffmpeg -i /home/abhijit/test_1036.mp4 -map 0:a -af volumedetect -f null - ffmpeg version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 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 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/abhijit/test_1036.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.40.101 Duration: 00:00:32.88, start: 0.023220, bitrate: 993 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 983 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default) Metadata: handler_name : SoundHandler Output #0, null, to 'pipe:': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.40.101 Stream #0:0(und): Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s (default) Metadata: handler_name : SoundHandler encoder : Lavc56.60.100 pcm_s16le Stream mapping: Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help size=N/A time=00:00:32.88 bitrate=N/A video:0kB audio:5664kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_volumedetect_0 @ 0x12b2ac0] n_samples: 2899968 [Parsed_volumedetect_0 @ 0x12b2ac0] mean_volume: -91.0 dB [Parsed_volumedetect_0 @ 0x12b2ac0] max_volume: -91.0 dB [Parsed_volumedetect_0 @ 0x12b2ac0] histogram_91db: 2899968 abhijit@AHMCPU2092:~$ Does arecord give you a proper audio file where you can hear the sound? > When I run arecord with default device, $ arecord -d 10 /tmp/test-mic.wav , this records from my microphone and plays well. When I specify the device with "hw:", like, $ arecord -D hw:0,1,0 -d 10 -f S16_LE /tmp/test-mic3.wav , I don't hear any audio from my microphone nor the youtube player. Thanks, Abhijit _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".