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Sur d’autres sites (8722)
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Error for android-ndk-r21d and ffmpeg-snapshot
4 août 2020, par yejafotwhy im getting the below errors.
Am i done any misconfiguration in the build file ?


Can you change it according, im trying to configure for arm64_v8a (.so) file for android jni in my linux machine. Thanks !


Below is my build file.


#!/bin/bash
export NDK=/media/sf_sharing/android-ndk-r21d
export SYSROOT=$NDK/platforms/android-21/arch-arm64/
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
export TARGET=aarch64-linux-android
export API=21
export AR=$TOOLCHAIN/bin/$TARGET-ar
export CC=$TOOLCHAIN/bin/$TARGET$API-clang
export CXX=$TOOLCHAIN/bin/$TARGET$API-clang++
export LD=$TOOLCHAIN/bin/$TARGET-ld
export RANLIB=$TOOLCHAIN/bin/$TARGET-ranlib
export STRIP=$TOOLCHAIN/bin/$TARGET-strip
export CROSS_PREFIX=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64
rm -f $(pwd)/compat/strtod.o 
function build_one
 {
 ./configure\
 --prefix=$PREFIX\
 --enable-shared\
 --disable-static\
 --ar=$AR\
 --cc=$CC\
 --cxx=$CXX\
 --pkg-config=$(which pkg-config)\
 --ld=$LD\
 --ranlib=$RANLIB\
 --strip=$STRIP\
 --enable-protocol=file\
 --enable-pic\
 --enable-small\
 --disable-programs\
 --disable-doc\
 --disable-symver\
 --target-os=android\
 --sysinclude=$TOOLCHAIN/sysroot/usr/include\
 --enable-cross-compile\
 --cross-prefix=$TOOLCHAIN/bin/$TARGET-\
 --extra-cflags="-Os -fpic $ADDI_CFLAGS"\
 --extra-ldflags="$ADDI_LDFLAGS"\
 --sysroot=$TOOLCHAIN/sysroot $ADDITIONAL_CONFIG_FLAG
 make clean
 make -j2
 make install
 }
 CPU=arm64-v8a
 mkdir -p $(pwd)/android/$CPU
 PREFIX=$(pwd)/android/$CPU
 ADDI_CFLAGS="-march=armv8-a"
 #ADDI_LDFLAGS="-L$TOOLCHAIN/sysroot/usr/lib"
 ADDI_LDFLAGS="-L$SYSROOT/usr/lib"
 ADDITIONAL_CONFIG_FLAG="--arch=aarch64 --enable-yasm"
 build_one


Error :


INSTALL doc/examples/Makefile
CC libavdevice/alldevices.o
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:39:
In file included from /media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/local/include/stdlib.h:32:
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdlib.h:61:7: error: expected identifier or '('
char* getenv(const char* __name);
 ^
./config.h:17:19: note: expanded from macro 'getenv'
#define getenv(x) NULL
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/include/stddef.h:89:18: note: expanded from macro 'NULL'
# define NULL ((void*)0)
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:39:
In file included from /media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/local/include/stdlib.h:32:
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdlib.h:61:7: error: expected ')'
./config.h:17:19: note: expanded from macro 'getenv'
#define getenv(x) NULL
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/include/stddef.h:89:18: note: expanded from macro 'NULL'
# define NULL ((void*)0)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdlib.h:61:7: note: to match this '('
./config.h:17:19: note: expanded from macro 'getenv'
#define getenv(x) NULL
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/include/stddef.h:89:17: note: expanded from macro 'NULL'
# define NULL ((void*)0)
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:39:
In file included from /media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/local/include/stdlib.h:32:
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdlib.h:61:7: error: expected ')'
char* getenv(const char* __name);
 ^
./config.h:17:19: note: expanded from macro 'getenv'
#define getenv(x) NULL
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/include/stddef.h:89:24: note: expanded from macro 'NULL'
# define NULL ((void*)0)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdlib.h:61:7: note: to match this '('
./config.h:17:19: note: expanded from macro 'getenv'
#define getenv(x) NULL
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/9.0.8/include/stddef.h:89:16: note: expanded from macro 'NULL'
# define NULL ((void*)0)
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:54:32: error: static declaration of 'cbrt' follows non-static declaration
static av_always_inline double cbrt(double x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:191:8: note: previous declaration is here
double cbrt(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:61:31: error: static declaration of 'cbrtf' follows non-static declaration
static av_always_inline float cbrtf(float x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:192:7: note: previous declaration is here
float cbrtf(float __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:68:32: error: static declaration of 'copysign' follows non-static declaration
static av_always_inline double copysign(double x, double y)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:279:8: note: previous declaration is here
double copysign(double __value, double __sign) __attribute_const__;
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:121:22: error: static declaration of 'erf' follows non-static declaration
static inline double erf(double z)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:211:8: note: previous declaration is here
double erf(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:340:9: warning: 'isnan' macro redefined [-Wmacro-redefined]
#define isnan(x) \
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:69:9: note: previous definition is here
#define isnan(x) __builtin_isnan(x)
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:359:9: warning: 'isfinite' macro redefined [-Wmacro-redefined]
#define isfinite(x) \
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:65:9: note: previous definition is here
#define isfinite(x) __builtin_isfinite(x)
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:366:31: error: static declaration of 'hypot' follows non-static declaration
static inline av_const double hypot(double x, double y)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:199:8: note: previous declaration is here
double hypot(double __x, double __y);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:423:22: error: static declaration of 'rint' follows non-static declaration
static inline double rint(double x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:239:8: note: previous declaration is here
double rint(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:430:43: error: static declaration of 'lrint' follows non-static declaration
static av_always_inline av_const long int lrint(double x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:243:6: note: previous declaration is here
long lrint(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:437:43: error: static declaration of 'lrintf' follows non-static declaration
static av_always_inline av_const long int lrintf(float x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:244:6: note: previous declaration is here
long lrintf(float __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:444:41: error: static declaration of 'round' follows non-static declaration
static av_always_inline av_const double round(double x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:251:8: note: previous declaration is here
double round(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:451:40: error: static declaration of 'roundf' follows non-static declaration
static av_always_inline av_const float roundf(float x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:252:7: note: previous declaration is here
float roundf(float __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:458:41: error: static declaration of 'trunc' follows non-static declaration
static av_always_inline av_const double trunc(double x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:263:8: note: previous declaration is here
double trunc(double __x);
 ^
In file included from libavdevice/alldevices.c:23:
In file included from ./libavformat/internal.h:27:
In file included from ./libavformat/avformat.h:312:
In file included from ./libavcodec/avcodec.h:31:
In file included from ./libavutil/samplefmt.h:24:
In file included from ./libavutil/avutil.h:296:
In file included from ./libavutil/common.h:533:
In file included from ./libavutil/internal.h:143:
./libavutil/libm.h:465:40: error: static declaration of 'truncf' follows non-static declaration
static av_always_inline av_const float truncf(float x)
 ^
/media/sf_sharing/android-ndk-r21d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/math.h:264:7: note: previous declaration is here
float truncf(float __x);
 ^
2 warnings and 15 errors generated.
make: *** [libavdevice/alldevices.o] Error 1
santoku@santoku:/media/sf_sharing/ffmpeg$


i tried all old version of ffmpeg,ndk with different build files but that didnt work so now im trying this latest ffmpeg-snapshot and ndk21


-
how to extract audio from video using ffmpeg c++
29 septembre 2020, par daenerysI am trying to write c++ code on how to extract audio from mp4 format file. I have compiled the examples in ffmpeg library and tried to run the demuxing_decoding.c file. The problem is that on running the code, it starts to decode way more than the actual file size and decodes wrong codec format (the decoded files cant be run).



here is the demuxing_decoding.c that I am trying to run :



#include 

#include <libavutil></libavutil>opt.h>
#include <libavcodec></libavcodec>avcodec.h>
#include <libavutil></libavutil>channel_layout.h>
#include <libavutil></libavutil>common.h>
#include <libavutil></libavutil>imgutils.h>
#include <libavutil></libavutil>mathematics.h>
#include <libavutil></libavutil>samplefmt.h>

#define INBUF_SIZE 4096
#define AUDIO_INBUF_SIZE 20480
#define AUDIO_REFILL_THRESH 4096

/* check that a given sample format is supported by the encoder */
static int check_sample_fmt(AVCodec *codec, enum AVSampleFormat sample_fmt)
{
 const enum AVSampleFormat *p = codec->sample_fmts;

 while (*p != AV_SAMPLE_FMT_NONE) {
 if (*p == sample_fmt)
 return 1;
 p++;
 }
 return 0;
}

/* just pick the highest supported samplerate */
static int select_sample_rate(AVCodec *codec)
{
 const int *p;
 int best_samplerate = 0;

 if (!codec->supported_samplerates)
 return 44100;

 p = codec->supported_samplerates;
 while (*p) {
 best_samplerate = FFMAX(*p, best_samplerate);
 p++;
 }
 return best_samplerate;
}

/* select layout with the highest channel count */
static int select_channel_layout(AVCodec *codec)
{
 const uint64_t *p;
 uint64_t best_ch_layout = 0;
 int best_nb_channels = 0;

 if (!codec->channel_layouts)
 return AV_CH_LAYOUT_STEREO;

 p = codec->channel_layouts;
 while (*p) {
 int nb_channels = av_get_channel_layout_nb_channels(*p);

 if (nb_channels > best_nb_channels) {
 best_ch_layout = *p;
 best_nb_channels = nb_channels;
 }
 p++;
 }
 return best_ch_layout;
}

/*
 * Audio encoding example
 */
static void audio_encode_example(const char *filename)
{
 AVCodec *codec;
 AVCodecContext *c= NULL;
 AVFrame *frame;
 AVPacket pkt;
 int i, j, k, ret, got_output;
 int buffer_size;
 FILE *f;
 uint16_t *samples;
 float t, tincr;

 printf("Encode audio file %s\n", filename);

 /* find the MP2 encoder */
 codec = avcodec_find_encoder(AV_CODEC_ID_MP2);
 if (!codec) {
 fprintf(stderr, "Codec not found\n");
 exit(1);
 }

 c = avcodec_alloc_context3(codec);
 if (!c) {
 fprintf(stderr, "Could not allocate audio codec context\n");
 exit(1);
 }

 /* put sample parameters */
 c->bit_rate = 64000;

 /* check that the encoder supports s16 pcm input */
 c->sample_fmt = AV_SAMPLE_FMT_S16;
 if (!check_sample_fmt(codec, c->sample_fmt)) {
 fprintf(stderr, "Encoder does not support sample format %s",
 av_get_sample_fmt_name(c->sample_fmt));
 exit(1);
 }

 /* select other audio parameters supported by the encoder */
 c->sample_rate = select_sample_rate(codec);
 c->channel_layout = select_channel_layout(codec);
 c->channels = av_get_channel_layout_nb_channels(c->channel_layout);

 /* open it */
 if (avcodec_open2(c, codec, NULL) < 0) {
 fprintf(stderr, "Could not open codec\n");
 exit(1);
 }

 f = fopen(filename, "wb");
 if (!f) {
 fprintf(stderr, "Could not open %s\n", filename);
 exit(1);
 }

 /* frame containing input raw audio */
 frame = av_frame_alloc();
 if (!frame) {
 fprintf(stderr, "Could not allocate audio frame\n");
 exit(1);
 }

 frame->nb_samples = c->frame_size;
 frame->format = c->sample_fmt;
 frame->channel_layout = c->channel_layout;

 /* the codec gives us the frame size, in samples,
 * we calculate the size of the samples buffer in bytes */
 buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size,
 c->sample_fmt, 0);
 if (buffer_size < 0) {
 fprintf(stderr, "Could not get sample buffer size\n");
 exit(1);
 }
 samples = av_malloc(buffer_size);
 if (!samples) {
 fprintf(stderr, "Could not allocate %d bytes for samples buffer\n",
 buffer_size);
 exit(1);
 }
 /* setup the data pointers in the AVFrame */
 ret = avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
 (const uint8_t*)samples, buffer_size, 0);
 if (ret < 0) {
 fprintf(stderr, "Could not setup audio frame\n");
 exit(1);
 }

 /* encode a single tone sound */
 t = 0;
 tincr = 2 * M_PI * 440.0 / c->sample_rate;
 for (i = 0; i < 200; i++) {
 av_init_packet(&pkt);
 pkt.data = NULL; // packet data will be allocated by the encoder
 pkt.size = 0;

 for (j = 0; j < c->frame_size; j++) {
 samples[2*j] = (int)(sin(t) * 10000);

 for (k = 1; k < c->channels; k++)
 samples[2*j + k] = samples[2*j];
 t += tincr;
 }
 /* encode the samples */
 ret = avcodec_encode_audio2(c, &pkt, frame, &got_output);
 if (ret < 0) {
 fprintf(stderr, "Error encoding audio frame\n");
 exit(1);
 }
 if (got_output) {
 fwrite(pkt.data, 1, pkt.size, f);
 av_free_packet(&pkt);
 }
 }

 /* get the delayed frames */
 for (got_output = 1; got_output; i++) {
 ret = avcodec_encode_audio2(c, &pkt, NULL, &got_output);
 if (ret < 0) {
 fprintf(stderr, "Error encoding frame\n");
 exit(1);
 }

 if (got_output) {
 fwrite(pkt.data, 1, pkt.size, f);
 av_free_packet(&pkt);
 }
 }
 fclose(f);

 av_freep(&samples);
 av_frame_free(&frame);
 avcodec_close(c);
 av_free(c);
}

/*
 * Audio decoding.
 */
static void audio_decode_example(const char *outfilename, const char *filename)
{
 AVCodec *codec;
 AVCodecContext *c= NULL;
 int len;
 FILE *f, *outfile;
 uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
 AVPacket avpkt;
 AVFrame *decoded_frame = NULL;

 av_init_packet(&avpkt);

 printf("Decode audio file %s to %s\n", filename, outfilename);

 /* find the mpeg audio decoder */
 codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
 if (!codec) {
 fprintf(stderr, "Codec not found\n");
 exit(1);
 }

 c = avcodec_alloc_context3(codec);
 if (!c) {
 fprintf(stderr, "Could not allocate audio codec context\n");
 exit(1);
 }

 /* open it */
 if (avcodec_open2(c, codec, NULL) < 0) {
 fprintf(stderr, "Could not open codec\n");
 exit(1);
 }

 f = fopen(filename, "rb");
 if (!f) {
 fprintf(stderr, "Could not open %s\n", filename);
 exit(1);
 }
 outfile = fopen(outfilename, "wb");
 if (!outfile) {
 av_free(c);
 exit(1);
 }

 /* decode until eof */
 avpkt.data = inbuf;
 avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);

 while (avpkt.size > 0) {
 int i, ch;
 int got_frame = 0;

 if (!decoded_frame) {
 if (!(decoded_frame = av_frame_alloc())) {
 fprintf(stderr, "Could not allocate audio frame\n");
 exit(1);
 }
 }

 len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
 if (len < 0) {
 fprintf(stderr, "Error while decoding\n");
 exit(1);
 }
 if (got_frame) {
 /* if a frame has been decoded, output it */
 int data_size = av_get_bytes_per_sample(c->sample_fmt);
 if (data_size < 0) {
 /* This should not occur, checking just for paranoia */
 fprintf(stderr, "Failed to calculate data size\n");
 exit(1);
 }
 for (i=0; inb_samples; i++)
 for (ch=0; chchannels; ch++)
 fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile);
 }
 avpkt.size -= len;
 avpkt.data += len;
 avpkt.dts =
 avpkt.pts = AV_NOPTS_VALUE;
 if (avpkt.size < AUDIO_REFILL_THRESH) {
 /* Refill the input buffer, to avoid trying to decode
 * incomplete frames. Instead of this, one could also use
 * a parser, or use a proper container format through
 * libavformat. */
 memmove(inbuf, avpkt.data, avpkt.size);
 avpkt.data = inbuf;
 len = fread(avpkt.data + avpkt.size, 1,
 AUDIO_INBUF_SIZE - avpkt.size, f);
 if (len > 0)
 avpkt.size += len;
 }
 }

 fclose(outfile);
 fclose(f);

 avcodec_close(c);
 av_free(c);
 av_frame_free(&decoded_frame);
}

/*
 * Video encoding example
 */
static void video_encode_example(const char *filename, int codec_id)
{
 AVCodec *codec;
 AVCodecContext *c= NULL;
 int i, ret, x, y, got_output;
 FILE *f;
 AVFrame *frame;
 AVPacket pkt;
 uint8_t endcode[] = { 0, 0, 1, 0xb7 };

 printf("Encode video file %s\n", filename);

 /* find the mpeg1 video encoder */
 codec = avcodec_find_encoder(codec_id);
 if (!codec) {
 fprintf(stderr, "Codec not found\n");
 exit(1);
 }

 c = avcodec_alloc_context3(codec);
 if (!c) {
 fprintf(stderr, "Could not allocate video codec context\n");
 exit(1);
 }

 /* put sample parameters */
 c->bit_rate = 400000;
 /* resolution must be a multiple of two */
 c->width = 352;
 c->height = 288;
 /* frames per second */
 c->time_base = (AVRational){1,25};
 /* emit one intra frame every ten frames
 * check frame pict_type before passing frame
 * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
 * then gop_size is ignored and the output of encoder
 * will always be I frame irrespective to gop_size
 */
 c->gop_size = 10;
 c->max_b_frames = 1;
 c->pix_fmt = AV_PIX_FMT_YUV420P;

 if (codec_id == AV_CODEC_ID_H264)
 av_opt_set(c->priv_data, "preset", "slow", 0);

 /* open it */
 if (avcodec_open2(c, codec, NULL) < 0) {
 fprintf(stderr, "Could not open codec\n");
 exit(1);
 }

 f = fopen(filename, "wb");
 if (!f) {
 fprintf(stderr, "Could not open %s\n", filename);
 exit(1);
 }

 frame = av_frame_alloc();
 if (!frame) {
 fprintf(stderr, "Could not allocate video frame\n");
 exit(1);
 }
 frame->format = c->pix_fmt;
 frame->width = c->width;
 frame->height = c->height;

 /* the image can be allocated by any means and av_image_alloc() is
 * just the most convenient way if av_malloc() is to be used */
 ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
 c->pix_fmt, 32);
 if (ret < 0) {
 fprintf(stderr, "Could not allocate raw picture buffer\n");
 exit(1);
 }

 /* encode 1 second of video */
 for (i = 0; i < 25; i++) {
 av_init_packet(&pkt);
 pkt.data = NULL; // packet data will be allocated by the encoder
 pkt.size = 0;

 fflush(stdout);
 /* prepare a dummy image */
 /* Y */
 for (y = 0; y < c->height; y++) {
 for (x = 0; x < c->width; x++) {
 frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
 }
 }

 /* Cb and Cr */
 for (y = 0; y < c->height/2; y++) {
 for (x = 0; x < c->width/2; x++) {
 frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
 frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
 }
 }

 frame->pts = i;

 /* encode the image */
 ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
 if (ret < 0) {
 fprintf(stderr, "Error encoding frame\n");
 exit(1);
 }

 if (got_output) {
 printf("Write frame %3d (size=%5d)\n", i, pkt.size);
 fwrite(pkt.data, 1, pkt.size, f);
 av_free_packet(&pkt);
 }
 }

 /* get the delayed frames */
 for (got_output = 1; got_output; i++) {
 fflush(stdout);

 ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
 if (ret < 0) {
 fprintf(stderr, "Error encoding frame\n");
 exit(1);
 }

 if (got_output) {
 printf("Write frame %3d (size=%5d)\n", i, pkt.size);
 fwrite(pkt.data, 1, pkt.size, f);
 av_free_packet(&pkt);
 }
 }

 /* add sequence end code to have a real mpeg file */
 fwrite(endcode, 1, sizeof(endcode), f);
 fclose(f);

 avcodec_close(c);
 av_free(c);
 av_freep(&frame->data[0]);
 av_frame_free(&frame);
 printf("\n");
}

/*
 * Video decoding example
 */

static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
 char *filename)
{
 FILE *f;
 int i;

 f = fopen(filename,"w");
 fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
 for (i = 0; i < ysize; i++)
 fwrite(buf + i * wrap, 1, xsize, f);
 fclose(f);
}

static int decode_write_frame(const char *outfilename, AVCodecContext *avctx,
 AVFrame *frame, int *frame_count, AVPacket *pkt, int last)
{
 int len, got_frame;
 char buf[1024];

 len = avcodec_decode_video2(avctx, frame, &got_frame, pkt);
 if (len < 0) {
 fprintf(stderr, "Error while decoding frame %d\n", *frame_count);
 return len;
 }
 if (got_frame) {
 printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count);
 fflush(stdout);

 /* the picture is allocated by the decoder, no need to free it */
 snprintf(buf, sizeof(buf), outfilename, *frame_count);
 pgm_save(frame->data[0], frame->linesize[0],
 frame->width, frame->height, buf);
 (*frame_count)++;
 }
 if (pkt->data) {
 pkt->size -= len;
 pkt->data += len;
 }
 return 0;
}

static void video_decode_example(const char *outfilename, const char *filename)
{
 AVCodec *codec;
 AVCodecContext *c= NULL;
 int frame_count;
 FILE *f;
 AVFrame *frame;
 uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
 AVPacket avpkt;

 av_init_packet(&avpkt);

 /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
 memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);

 printf("Decode video file %s to %s\n", filename, outfilename);

 /* find the mpeg1 video decoder */
 codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
 if (!codec) {
 fprintf(stderr, "Codec not found\n");
 exit(1);
 }

 c = avcodec_alloc_context3(codec);
 if (!c) {
 fprintf(stderr, "Could not allocate video codec context\n");
 exit(1);
 }

 if (codec->capabilities & AV_CODEC_CAP_TRUNCATED)
 c->flags |= AV_CODEC_FLAG_TRUNCATED; // we do not send complete frames

 /* For some codecs, such as msmpeg4 and mpeg4, width and height
 MUST be initialized there because this information is not
 available in the bitstream. */

 /* open it */
 if (avcodec_open2(c, codec, NULL) < 0) {
 fprintf(stderr, "Could not open codec\n");
 exit(1);
 }

 f = fopen(filename, "rb");
 if (!f) {
 fprintf(stderr, "Could not open %s\n", filename);
 exit(1);
 }

 frame = av_frame_alloc();
 if (!frame) {
 fprintf(stderr, "Could not allocate video frame\n");
 exit(1);
 }

 frame_count = 0;
 for (;;) {
 avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
 if (avpkt.size == 0)
 break;

 /* NOTE1: some codecs are stream based (mpegvideo, mpegaudio)
 and this is the only method to use them because you cannot
 know the compressed data size before analysing it.

 BUT some other codecs (msmpeg4, mpeg4) are inherently frame
 based, so you must call them with all the data for one
 frame exactly. You must also initialize 'width' and
 'height' before initializing them. */

 /* NOTE2: some codecs allow the raw parameters (frame size,
 sample rate) to be changed at any frame. We handle this, so
 you should also take care of it */

 /* here, we use a stream based decoder (mpeg1video), so we
 feed decoder and see if it could decode a frame */
 avpkt.data = inbuf;
 while (avpkt.size > 0)
 if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0)
 exit(1);
 }

 /* some codecs, such as MPEG, transmit the I and P frame with a
 latency of one frame. You must do the following to have a
 chance to get the last frame of the video */
 avpkt.data = NULL;
 avpkt.size = 0;
 decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1);

 fclose(f);

 avcodec_close(c);
 av_free(c);
 av_frame_free(&frame);
 printf("\n");
}

int main(int argc, char **argv)
{
 const char *output_type;

 /* register all the codecs */
 avcodec_register_all();

 if (argc < 2) {
 printf("usage: %s output_type\n"
 "API example program to decode/encode a media stream with libavcodec.\n"
 "This program generates a synthetic stream and encodes it to a file\n"
 "named test.h264, test.mp2 or test.mpg depending on output_type.\n"
 "The encoded stream is then decoded and written to a raw data output.\n"
 "output_type must be chosen between 'h264', 'mp2', 'mpg'.\n",
 argv[0]);
 return 1;
 }
 output_type = argv[1];

 if (!strcmp(output_type, "h264")) {
 video_encode_example("test.h264", AV_CODEC_ID_H264);
 } else if (!strcmp(output_type, "mp2")) {
 audio_encode_example("test.mp2");
 audio_decode_example("test.pcm", "test.mp2");
 } else if (!strcmp(output_type, "mpg")) {
 video_encode_example("test.mpg", AV_CODEC_ID_MPEG1VIDEO);
 video_decode_example("test%02d.pgm", "test.mpg");
 } else {
 fprintf(stderr, "Invalid output type '%s', choose between 'h264', 'mp2', or 'mpg'\n",
 output_type);
 return 1;
 }

 return 0;
}



What could be wrong ?
The command I used is :



./demuxing_decoding /home/cortana/Burn.mp4 /home/cortana/Desktop/Burn.mp4 /home/cortana/Desktop/Burn.aac


-
How can I capture simple video input with audio from a capture device
17 décembre 2020, par Geoff SweetI'm using ffmpeg on Arch linux and trying to convert some old video to digital. The setup is pretty straightforward and if I connect to the capture device with VLC I get the video and audio just fine. So now I want to capture that with ffmpeg and write it to a file so I can edit it and clean it up. I'm only so-so familiar with ffmpeg and I've been digging through the man pages and here is where I am at.


This command captures perfect audio, but no video :


ffmpeg -f alsa -ac 2 -i front:CARD=Capture,DEV=0 out.mpeg


This command captures perfect video ;


ffmpeg -f video4linux2 -i /dev/video0 out.mpeg


captures the video signal great, but with no audio. So combining them together should give me :


ffmpeg -y -f alsa -ac 2 -i front:CARD=Capture,DEV=0 -f video4linux2 -i /dev/video0 out.mpeg


But that command kinda falls on it's face. I get the audio, but no video :


ffmpeg -y -f alsa -ac 2 -i front:CARD=Capture,DEV=0 -f video4linux2 -i /dev/video0 out.mpeg
ffmpeg version n4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 10.2.0 (GCC)
 configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-shared --enable-version3
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'front:CARD=Capture,DEV=0':
 Duration: N/A, start: 1608093176.894565, bitrate: 1536 kb/s
 Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[video4linux2,v4l2 @ 0x56248fe0ab80] Dequeued v4l2 buffer contains corrupted data (0 bytes).
Input #1, video4linux2,v4l2, from '/dev/video0':
 Duration: N/A, start: 0.000000, bitrate: 995328 kb/s
 Stream #1:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 995328 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
Stream mapping:
 Stream #1:0 -> #0:0 (rawvideo (native) -> mpeg1video (native))
 Stream #0:0 -> #0:1 (pcm_s16le (native) -> mp2 (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x56248fe0ab80] Dequeued v4l2 buffer contains corrupted data (0 bytes).
 Last message repeated 30 times
[alsa @ 0x56248fdb3840] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[mpeg @ 0x56248fe0dfc0] VBV buffer size not set, using default size of 230KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
Output #0, mpeg, to 'out.mpeg':
 Metadata:
 encoder : Lavf58.45.100
 Stream #0:0: Video: mpeg1video, yuv420p(progressive), 1920x1080, q=2-31, 200 kb/s, 30 fps, 90k tbn, 30 tbc
 Metadata:
 encoder : Lavc58.91.100 mpeg1video
 Side data:
 cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
 Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
 Metadata:
 encoder : Lavc58.91.100 mp2
frame= 2 fps=0.0 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=2.0 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=1.3 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=1.0 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.8 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.7 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.6 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.5 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.4 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.4 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.4 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.3 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.3 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.3 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.3 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.2 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/sframe= 2 fps=0.1 q=3.2 size= 0kB time=01:48:49.26 bitrate= 0.0kbits/s[video4linux2,v4l2 @ 0x56248fe0ab80] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=0 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=2020 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=4061 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=6102 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=8143 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=10184 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=12225 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=14266 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=16307 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=18348 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=20389 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=22430 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=24471 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=26512 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=28553 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=30594 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=32635 size=36451
[mpeg @ 0x56248fe0dfc0] buffer underflow st=0 bufi=34676 size=36451
frame= 2 fps=0.1 q=2.0 Lsize= 1470kB time=01:48:49.30 bitrate= 1.8kbits/s speed= 221x 
video:63kB audio:1388kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.314351%
Exiting normally, received signal 2.


what I would ideally like is just a fairly raw 2ch stereo "dump" of what comes through the capture card.


As always, I super appreciate any advice


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