On date Monday 2012-11-12 14:50:24 -0600, Ron Woods wrote: > I am trying out the filtering_audio.c example provided with the ffmpeg > libraries for Windows to extract the audio from a MP4 file, resample to 8 KHz > and convert from stereo to mono. The example pipes the audio output via > stdout to ffplay. I am using Visual Studio 2010 and the example successfully > builds and runs but the result is clearly not the desired result. At the end > of init_filters I added a call to avfilter_graph_dump() and it all looks > correct and also the pipe to ffplay as in this trace: > > abuffer filter args: > time_base=1/24000:sample_rate=24000:sample_fmt=s16:channel_layout=0x4 > Output: srate:8000Hz fmt:s16 chlayout:mono > +-----------+ > | in |default--[24000Hz s16:mono]--Parsed_aconvert_0:default > | (abuffer) | > +-----------+ > > +-----------------+ > Parsed_aresample_1:default--[8000Hz s16:mono]--default| out | > | (ffabuffersink) | > +-----------------+ > > +-------------------+ > in:default--[24000Hz s16:mono]--default| Parsed_aconvert_0 |default--[24000Hz > s16:mono]-Parsed_aresample_1:default > | (aconvert) | > +-------------------+ > > +--------------------+ > Parsed_aconvert_0:default--[24000Hz s16:mono]--default| Parsed_aresample_1 > |default--[8000Hz s16:mono]--out:default > | (aresample) | > +--------------------+
> [s16le @ 003edda0] Invalid sample rate 0 specified using default of 44100 This is fishy. > [s16le @ 003edda0] Estimating duration from bitrate, this may be inaccurate > Input #0, s16le, from 'pipe:': > Duration: N/A, start: 0.000000, bitrate: 128 kb/s > Stream #0:0: Audio: pcm_s16le, 8000 Hz, 1 channels, s16, 128 kb/s > > If you have made this example run properly on Windows in VS 2010, would you > please provide any tips or changes you made for it to work? I just tried latest git and seems to work fine here (Linux). Does the problem depend on the input file? -- FFmpeg = Funny and Fierce Merciless Practical Extended Goblin _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
