[Peter Belkner]
> BS1770GAIN is based on FFmpeg. If a file is not processable by FFmpeg
> it is not processable by BS1770GAIN.
>
> This particular sample file seems not to be processable by FFmpeg. Try
> e.g. the following command
>
> $ ffmpeg -i samples/20030213-cvs.mpeg -acodec copy -vcodec copy -y
> 20030213-cvs.mpeg
Thank you for looking into this, and it is good to have a way to detect
if the file should work with bs1770gain or not.
But are you sure the stuttering sound is due to the messages from ffmpeg
in this case? I picked the MPEG file because it showed the problem and
was publicly available. But as I mentioned, I see the problem with
other files too, and discovered it using a non-public DV file. Here is
an example DV file from the set where I discovered the problem first:
% ffmpeg -i makercon-50.dv -acodec copy -vcodec copy -y makercon-50-new.dv
ffmpeg version 2.7-1 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-20)
configuration: --prefix=/usr --extra-version=1 --build-suffix=-ffmpeg
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared
--disable-stripping --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-libspeex --enable-libssh --enable-libtheora --enable-libtwolame
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp
--enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394
--enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r
--enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv -
-enable-libx265
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 41.100 / 56. 41.100
libavformat 56. 36.100 / 56. 36.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
[dv @ 0x1524ce0] Estimating duration from bitrate, this may be inaccurate
Input #0, dv, from 'makercon-50.dv':
Metadata:
timecode : 05:32:37:05
Duration: 00:00:03.96, start: 0.000000, bitrate: 28800 kb/s
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 64:45 DAR 16:9], 28800
kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Output #0, dv, to 'makercon-50-new.dv':
Metadata:
timecode : 05:32:37:05
encoder : Lavf56.36.100
Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 64:45 DAR 16:9],
q=2-31, 28800 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, 1536 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
makercon-50.dv: Input/output error
frame= 99 fps=0.0 q=-1.0 Lsize= 13922kB time=00:00:03.96
bitrate=28800.0kbits/s
video:13922kB audio:742kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
%
If I transcode it using bs1770gain, I end up with a file with stuttering
audio.
If you lack a DV file to test from, you can try yourself using the 1.1
GiB file available from
<URL: http://ftp.frikanalen.tv/media/625330/broadcast/DavidGallo_2007.dv >.
--
Happy hacking
Petter Reinholdtsen
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