Re: Smooth in mplayer, choppy in vlc

On 10/24/14 02:09, Grant wrote:
>>>>>>> My camera produces 1080p 60fps videos which play back choppy on
>>>>>>> mplayer and vlc on my Dell XPS13 laptop.  If I use -lavdopts threads=4
>>>>>>> with mplayer, playback is smooth.  I tried increasing ffmpeg threads
>>>>>>> from 0 to 4 in the vlc settings but playback is still choppy.  I'm
>>>>>>> also curious if vaapi should be negating the need for threads in vlc.
>>>>>>>
>>>>>> I suggest you enable hardware acceleration.
>>>>>
>>>>> My results are the same with 'vlc --avcodec-hw=vaapi'.
>>>>>
>>>>> - Grant
>>>> Maybe the video output drive? XV, OpenGL etc...
>>>
>>> Actually, if I disable audio in vlc, playback is smooth.  Why would
>>> audio bog things down so much for vlc?
>>>
>>> $ ffmpeg -i 00000.MTS
>>> ffmpeg version 1.2.6 Copyright (c) 2000-2014 the FFmpeg developers
>>>     built on Jul 23 2014 04:24:34 with gcc 4.7.3 (Gentoo 4.7.3-r1 p1.4,
>>> pie-0.5.5)
>>>     configuration: --prefix=/usr --libdir=/usr/lib64
>>> --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared
>>> --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++
>>> --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O2 -pipe
>>> -fomit-frame-pointer' --extra-cflags='-march=native -O2 -pipe
>>> -fomit-frame-pointer' --extra-cxxflags='-march=native -O2 -pipe
>>> -fomit-frame-pointer' --disable-static --enable-gpl --enable-postproc
>>> --enable-avfilter --enable-avresample --disable-stripping
>>> --enable-version3 --enable-nonfree --disable-indev=oss
>>> --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect
>>> --disable-debug --disable-doc --disable-gnutls
>>> --enable-hardcoded-tables --enable-iconv --enable-network
>>> --disable-openssl --enable-ffplay --enable-vaapi --disable-vdpau
>>> --enable-zlib --enable-libvo-aacenc --disable-libvo-amrwbenc
>>> --enable-libmp3lame --disable-libfdk-aac --disable-libaacplus
>>> --enable-libfaac --disable-libtheora --disable-libtwolame
>>> --enable-libx264 --enable-libxvid --disable-libcdio --disable-l
>>> libavutil      52. 18.100 / 52. 18.100
>>>     libavcodec     54. 92.100 / 54. 92.100
>>>     libavformat    54. 63.104 / 54. 63.104
>>>     libavdevice    54.  3.103 / 54.  3.103
>>>     libavfilter     3. 42.103 /  3. 42.103
>>>     libswscale      2.  2.100 /  2.  2.100
>>>     libswresample   0. 17.102 /  0. 17.102
>>>     libpostproc    52.  2.100 / 52.  2.100
>>> Input #0, mpegts, from '00000.MTS':
>>>     Duration: 00:00:05.99, start: 1.016689, bitrate: 26129 kb/s
>>>     Program 1
>>>       Stream #0:0[0x1011]: Video: h264 (High) (HDPR / 0x52504448),
>>> yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn,
>>> 119.88 tbc
>>>       Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
>>> stereo, fltp, 256 kb/s
>>>       Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] /
>>> 0x0090)
>>>
>>> - Grant
>>
>> The sound server.
>>
>> Try playing other 48K or above ac3 audio streams.
>
> You're right, I tried a 1080p Blu-Ray rip and it is also choppy with
> audio enabled and smooth with audio disabled.  mplayer plays both the
> Blu-Ray rip and the 60fps file smoothly.  I fiddled with the vlc audio
> settings to no avail.  Do you know how to fix this?
>
> - Grant
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mplayer is probably using alsa, and VLC is using pulseaudio. Try 
switching the audio output between alsa and pulse in VLC.
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