Hello,
I'm using the library under Win32. I have to decode MPEG4 ASP frame
and then render it with BitBlt.
I try to accomplish this using avcodec_decode_video2(), but it seems
to produce some YUV image. Is it possible to decode into RGB format
directly?
Thanks!
Please correct me if I'm wrong, but I don't believe that's possible.
I'm also decoding MP4's, and I haven't found a way to get around using a call
to sws_scale() or the deprecated img_convert to convert the images.
I'm not sure I got you right - do you successfully use
avcodec_decode_video2()
Assuming you prefer the modern version:
struct SwsContext* hSwsContext = sws_getContext(pCodecCtx-width,
pCodecCtx-height, pCodecCtx-pix_fmt,
pCodecCtx-width, pCodecCtx-height, PIX_FMT_RGB24, SWS_AREA, NULL,
NULL, NULL)
avcodec_decode_video2(pCodecCtx, pFrame,
Assuming you prefer the modern version:
struct SwsContext* hSwsContext = sws_getContext(pCodecCtx-width,
pCodecCtx-height, pCodecCtx-pix_fmt,
pCodecCtx-width, pCodecCtx-height, PIX_FMT_RGB24, SWS_AREA, NULL,
NULL, NULL)
avcodec_decode_video2(pCodecCtx, pFrame,
Has anyone managed to do the subj with all the recent ARM-specific
optimizations?
My application receives MPEG4 video from network, decodes frame by
frame with avcodec_decode_video2(), then converts to 32-bit RGB with
sws_scale(). On PC (Win32 on Intel) it works well, but on iPhone I
always
I did that and had similar problem. I was able to workaround the problems by
disabling some build optimizations. To be more specific they were:
--disable-mmx --disable-mmx2 --disable-neon --disable-armv5te
--disable-iwmmxt --disable-optimizations.
Well, as I wrote, I disabled all the
Hello,
I encountered strange behaviour, when using avcodec_encode_video() to
make jpeg image. My project is Windows COM dll, which is used from
within a .NET client, and when the above function is called in a
thread originated from .NET, it always crashes in a very strange
manner. However, if the
Use av_audio_resample_init(), audio_resample() and so on to convert audio
formats.
Thank you for your response.
I tried to resample the audio, and it really did the job. Still, one issue
remained: along with the voice, there's a very loud permanent noise (kind of
background crackles/hum). I
I tried to resample the audio, and it really did the job. Still, one issue
remained: along with the voice, there's a very loud permanent noise (kind of
background crackles/hum).
Well, it seems that the problem wasn't in the parameters to
av_audio_resample_init(), but in audio_resample(). In
Right, it's number of samples, so in this case bytes / sizeof(float).
I thought that SAMPLE_FMT_FLT designates 4-byte float.
At least, when I treated the original non-resampled sound as SAMPLE_FMT_S32,
there was some reasonable sound (with a lot of noise), while SAMPLE_FMT_S16
didn't produce
I'm using Martin Bohme example to extract frame from a video, and I would
like to save them with jpeg format (not ppm, as in the example). I suposse I
have to change the pix_fmt to other that supports jpeg (for instance
PIX_FMT_YUVJ444P). But I don't know yet how to save the header or what I
Hello,
In my application I write a video-stream (ASP MPEG4) to an *.avi file
using av_write_frame().
During a stress-test, in which I deal with 100 streams simultaneously,
I noticed that the memory consumption is going up constantly, until I
close the files. In 5 minutes it grows by ~350Mb, then
Thanks a lot for your detailed explanations, the things got more clear now.
First of all, lowering time_base solved the memory consumtion issue:
http://permalink.gmane.org/gmane.comp.video.ffmpeg.libav.user/4636
If you know that your video has a constant framerate of 10 then you
should set
Hello,
After decoding an AMR-NB audio with avcodec_decode_audio3(), I receive
SAMPLE_FMT_FLT output (don't know why).
Since my PCM player can't play such a format, I resample it to SAMPLE_FMT_S16:
audio_resample(resampleCtx, (short *)pcmResampled, (short *)pcm, cb /
sizeof(float));
...where cb
Could you please remove me from forum mail lists.
Here you go:
https://lists.mplayerhq.hu/mailman/listinfo/libav-user
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Tried logging onto your site several times over the last week or two, but
always run into the message Firefox can't establish a connection to the
server at lists.mplayerhq.hu.. Do not know why this is. I've reset my router
a few times during this time. Guess your server has been okay? No
Hello,
In my project I decode ASP MPEG4 video streams with
avcodec_decode_video2(). Most of the streams are decoded well, but
some fail and produce the following output.
FWIW, I can successfully decode them with xvidcore.
I'd appreciate any idea.
[mpeg4 @ 0357b780]Static Sprites not supported
Hello,
In my project I use libavcodec to decode mpeg4 videdoe streams. I've
just upgraded to 0.6, and all the decoding stopped working.
Instead I get the following debug output:
[mpeg4 @ 05c204e0]Static Sprites not supported
[mpeg4 @ 05c204e0]N-bit not supported
[mpeg4 @ 05c204e0]quant precision
Hello,
I'm trying to build ver0.6 with gcc4.5.0 (WinXP, MinGW/MSys), and it
fails with internal compiler error:
$ make distclean
$ ./configure --disable-everything --disable-sse --disable-mmx
--disable-optimizations
$ make
CC libavcodec/eval.o
libavcodec/eval.c: In function 'eval_expr':
GCC 4.5.0-1, mingwrt-3.18-mingw32, binutils-2.20-1-mingw32 and
w32api-3.14-mingw32 work fine with FFMPEG0.6
Thanks for the information!
Reinstalling Msys/MinGW really fixed the things.
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Hi, Anyone have idea regarding my problem then please help me. i am
not able to decode P-Frame only.Please help me by telling what i am
missing?
I'm not sure if it's relevant to your issue, but I experienced a
problem with mpeg4 streams produced by old xvid encoder, and the
following patch
Can u explain little more about this?
I ain't an expert, all I know is that some old xvid encoders used to
produce an incorrect vol-header on very low frame-rates, and that the
patch I mentioned helps in such a case. Again, I'm not sure it's
relevant for your case, but you can try it.
I didn’t find any API which decode the buffer data and produce the result.
Can any body please lat me know how I can work on Data buffer?
Doesn't avcodec_decode_video2() do this?
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You need libjpeg.
I never worked with ppm, but as for bmp, I convert it to jpeg without
libjpeg. First I scale it with sws_scale() from RGB to
PIX_FMT_YUV420P, then encode with avcodec_encode_video() to
PIX_FMT_YUVJ420P.
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I would recommend avoid using PIX_FMT_YUV420P for jpeg files, instead
convert straight from RGB to PIX_FMT_YUVJ420P.
YUV420P has a smaller dynamic range than YUVJ420P and is only useful for
video.
You may even want to consider using a 422 codec rather than a 420 (or even
444), depending on
Does anyone have a simple sample iPhone project that allows video to be
converted from one format to another
I don't have such a sample project, but I do develop projects for
iPhone with ffmpeg libs (libavcodec etc), and it doesn't differ from
using ffmpeg on Windows. Actually, we compile on
Sorry to bother you again but I have created an App that executes the command
line functions as you suggested.
When I run the App on the iPhone simulator, the mp4 file that is produced
is OK.
When I run it on an iPhone the mp4 file has a green screen with distorted
images. The sound
Not sure I understand this comment in the thread. How do I set -arch=c
compile option?
This is one of configure options, but pay attention that it should
begin with double -: --arch=c.
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Interesting - I will give it a try. If someone could specify the exact codec
to use I would appreciate it.
CODEC_ID_MJPEG
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Hello,
In my application I receive from a remote server synchronized video
(mpeg4 asp) and audio (mp3) and mux them to avi file. The video comes
frame-by-frame, and the audio comes in small chunks, say 200-250 ms.
Both video frames and audio chunks have time-stamps in ms.
My question is how to
In my application I receive from a remote server synchronized video
(mpeg4 asp) and audio (mp3) and mux them to avi file. The video comes
frame-by-frame, and the audio comes in small chunks, say 200-250 ms.
Both video frames and audio chunks have time-stamps in ms.
My question is how to set
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