Re: lavplay does not work

Hallo

Janos G. Komaromi wrote:
> On 12/05/2016 01:02 PM, Bernhard Praschinger wrote:
>> You can use the -U/--use-write Option and see if that helps.
> Does not help, all I hear is a pop in the beginning, then nothing. See
> my command and output below:
> [apu@andraslinux ~]$ glav -p S -U +n -v 2 record.avi
> ++:    INFO: [lavplay] Norm set to NTSC
> ++:    INFO: [lavplay] Initialising SDL
> ++:    INFO: [lavplay] SDL YUV overlay: hardware
> ++:    INFO: [lavplay] Using read(2)/write(2) system call for
> capture/playpack
> ++:    INFO: [lavplay] Output norm: NTSC
> ++:    INFO: [lavplay] Output dimensions: 320x240
> ++: lavtools version 1.9.0
> ++: ++ WARN: [lavplay] Unable to set negative priority for audio thread.
> ++: ++ WARN: [lavplay] Pthread Real-time scheduling for audio thread
> could not be enabled.
> ++:
That output looks ok. I guess that adding the +n should not make any 
difference.

>> Did you check the mixer settings when you play back the file ?
> cat anytextfile.txt > /dev/dsp produces loud noise in speakers
Ok.

>> It could be that environment Variable  LAV_AUDIO_DEV is set wrong.
>>
>> Can you run lavinfo filename.avi and post at least the audio related
>> info, it should look like that:
>> has_audio=1
>> audio_bps=4
>> audio_chans=2
>> audio_bits=16
>> audio_rate=44100
>> ---ENDE---
> See below::
> [apu@andraslinux ~]$ lavinfo record.avi
> video_frames=554
> video_width=320
> video_height=240
> video_inter=p
> video_norm=NTSC
> video_fps=29.970629
> video_sar_width=1
> video_sar_height=1
> max_frame_size=19220
> chroma=422
> has_audio=1
> audio_bps=1
> audio_chans=1
> audio_bits=8
> audio_rate=44100
> num_video_files=1
What was the setting when you did record the audio signal ? I would 
guess that it was mono and 8Bit Samples and 44.1kHz samplerate. I 
haven't seen such a setup long time ago. It can be that lavplay/glav 
have problems (=bug) playing such a audio stream back. Can you try 
recording in Stereo, 16Bit and 44.1kHz ? And see if that makes any 
difference ?
You can split the audio and video with lavtrans, and add a WAV file to 
the video with lavaddwav.

> also:
> My modules, excerpted from lsmod:
> ...
> snd_intel8x0           19052  0
> snd_ac97_codec         76031  1 snd_intel8x0
> ac97_bus                 618  1 snd_ac97_codec
> snd_pcm_oss            27105  0
> snd_mixer_oss           9866  1 snd_pcm_oss
> snd_pcm                40209  3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
> snd_timer              11572  1 snd_pcm
> snd                    29851  6
> snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
> soundcore               3105  1 snd
> snd_page_alloc          4565  2 snd_intel8x0,snd_pcm
> ...
That lookes good.

> Thanks for your answer; I did receive the email correctly and responding
> here to it.
> Hope we can get to the bottom of this.


auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: [email protected]
www: http://www.lysator.liu.se/~gz/bernhard

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