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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
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Sur d’autres sites (14018)
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Encoding/Decoding H264 using libav in C++ [closed]
20 mai, par gbock93I want to build an application to


- 

- capture frames in YUYV 4:2:2 format
- encode them to H264
- send over network
- decode the received data
- display the video stream












To do so I wrote 2 classes, H264Encoder and H264Decoder.


I post only the .cpp contents, the .h are trivial :


H264Encoder.cpp


#include 

#include <stdexcept>
#include <iostream>

H264Encoder::H264Encoder(unsigned int width_, unsigned int height_, unsigned int fps_):
 m_width(width_),
 m_height(height_),
 m_fps(fps_),
 m_frame_index(0),
 m_context(nullptr),
 m_frame(nullptr),
 m_packet(nullptr),
 m_sws_ctx(nullptr)
{
 // Find the video codec
 AVCodec* codec;
 codec = avcodec_find_encoder(AV_CODEC_ID_H264);
 if (!codec)
 throw std::runtime_error("[Encoder]: Error: Codec not found");

 // Allocate codec
 m_context = avcodec_alloc_context3(codec);
 if (!m_context)
 throw std::runtime_error("[Encoder]: Error: Could not allocate codec context");

 // Configure codec
 av_opt_set(m_context->priv_data, "preset", "ultrafast", 0);
 av_opt_set(m_context->priv_data, "tune", "zerolatency", 0);
 av_opt_set(m_context->priv_data, "crf", "35", 0); // Range: [0; 51], sane range: [18; 26], lower -> higher compression

 m_context->width = (int)width_;
 m_context->height = (int)height_;
 m_context->time_base = {1, (int)fps_};
 m_context->framerate = {(int)fps_, 1};
 m_context->codec_id = AV_CODEC_ID_H264;
 m_context->pix_fmt = AV_PIX_FMT_YUV420P; // H265|4 codec take as input only AV_PIX_FMT_YUV420P
 m_context->bit_rate = 400000;
 m_context->gop_size = 10;
 m_context->max_b_frames = 1;

 // Open codec
 if (avcodec_open2(m_context, codec, nullptr) < 0)
 throw std::runtime_error("[Encoder]: Error: Could not open codec");

 // Allocate frame and its buffer
 m_frame = av_frame_alloc();
 if (!m_frame) 
 throw std::runtime_error("[Encoder]: Error: Could not allocate frame");

 m_frame->format = m_context->pix_fmt;
 m_frame->width = m_context->width;
 m_frame->height = m_context->height;

 if (av_frame_get_buffer(m_frame, 0) < 0)
 throw std::runtime_error("[Encoder]: Error: Cannot allocate frame buffer");
 
 // Allocate packet
 m_packet = av_packet_alloc();
 if (!m_packet) 
 throw std::runtime_error("[Encoder]: Error: Could not allocate packet");

 // Convert from YUYV422 to YUV420P
 m_sws_ctx = sws_getContext(
 width_, height_, AV_PIX_FMT_YUYV422,
 width_, height_, AV_PIX_FMT_YUV420P,
 SWS_BILINEAR, nullptr, nullptr, nullptr
 );
 if (!m_sws_ctx) 
 throw std::runtime_error("[Encoder]: Error: Could not allocate sws context");

 //
 printf("[Encoder]: H264Encoder ready.\n");
}

H264Encoder::~H264Encoder()
{
 sws_freeContext(m_sws_ctx);
 av_packet_free(&m_packet);
 av_frame_free(&m_frame);
 avcodec_free_context(&m_context);

 printf("[Encoder]: H264Encoder destroyed.\n");
}

std::vector H264Encoder::encode(const cv::Mat& img_)
{
 /*
 - YUYV422 is a packed format. It has 3 components (av_pix_fmt_desc_get((AVPixelFormat)AV_PIX_FMT_YUYV422)->nb_components == 3) but
 data is stored in a single plane (av_pix_fmt_count_planes((AVPixelFormat)AV_PIX_FMT_YUYV422) == 1).
 - YUV420P is a planar format. It has 3 components (av_pix_fmt_desc_get((AVPixelFormat)AV_PIX_FMT_YUV420P)->nb_components == 3) and
 each component is stored in a separate plane (av_pix_fmt_count_planes((AVPixelFormat)AV_PIX_FMT_YUV420P) == 3) with its
 own stride.
 */
 std::cout << "[Encoder]" << std::endl;
 std::cout << "[Encoder]: Encoding img " << img_.cols << "x" << img_.rows << " | element size " << img_.elemSize() << std::endl;
 assert(img_.elemSize() == 2);

 uint8_t* input_data[1] = {(uint8_t*)img_.data};
 int input_linesize[1] = {2 * (int)m_width};
 
 if (av_frame_make_writable(m_frame) < 0)
 throw std::runtime_error("[Encoder]: Error: Cannot make frame data writable");

 // Convert from YUV422 image to YUV420 frame. Apply scaling if necessary
 sws_scale(
 m_sws_ctx,
 input_data, input_linesize, 0, m_height,
 m_frame->data, m_frame->linesize
 );
 m_frame->pts = m_frame_index;

 int n_planes = av_pix_fmt_count_planes((AVPixelFormat)m_frame->format);
 std::cout << "[Encoder]: Sending Frame " << m_frame_index << " with dimensions " << m_frame->width << "x" << m_frame->height << "x" << n_planes << std::endl;
 for (int i=0; iframerate.num) + 1;
 break;
 case AVERROR(EAGAIN):
 throw std::runtime_error("[Encoder]: avcodec_send_frame: EAGAIN");
 case AVERROR_EOF:
 throw std::runtime_error("[Encoder]: avcodec_send_frame: EOF");
 case AVERROR(EINVAL):
 throw std::runtime_error("[Encoder]: avcodec_send_frame: EINVAL");
 case AVERROR(ENOMEM):
 throw std::runtime_error("[Encoder]: avcodec_send_frame: ENOMEM");
 default:
 throw std::runtime_error("[Encoder]: avcodec_send_frame: UNKNOWN");
 }

 // Receive packet from codec
 std::vector result;
 while(ret >= 0)
 {
 ret = avcodec_receive_packet(m_context, m_packet);

 switch (ret)
 {
 case 0:
 std::cout << "[Encoder]: Received packet from codec of size " << m_packet->size << " bytes " << std::endl;
 result.insert(result.end(), m_packet->data, m_packet->data + m_packet->size);
 av_packet_unref(m_packet);
 break;

 case AVERROR(EAGAIN):
 std::cout << "[Encoder]: avcodec_receive_packet: EAGAIN" << std::endl;
 break;
 case AVERROR_EOF:
 std::cout << "[Encoder]: avcodec_receive_packet: EOF" << std::endl;
 break;
 case AVERROR(EINVAL):
 throw std::runtime_error("[Encoder]: avcodec_receive_packet: EINVAL");
 default:
 throw std::runtime_error("[Encoder]: avcodec_receive_packet: UNKNOWN");
 }
 }

 std::cout << "[Encoder]: Encoding complete" << std::endl;
 return result;
}
</iostream></stdexcept>

H264Decoder.cpp


#include 

#include <iostream>
#include <stdexcept>

H264Decoder::H264Decoder():
 m_context(nullptr),
 m_frame(nullptr),
 m_packet(nullptr)
{
 // Find the video codec
 AVCodec* codec;
 codec = avcodec_find_decoder(AV_CODEC_ID_H264);
 if (!codec)
 throw std::runtime_error("[Decoder]: Error: Codec not found");

 // Allocate codec
 m_context = avcodec_alloc_context3(codec);
 if (!m_context)
 throw std::runtime_error("[Decoder]: Error: Could not allocate codec context");

 // Open codec
 if (avcodec_open2(m_context, codec, nullptr) < 0)
 throw std::runtime_error("[Decoder]: Error: Could not open codec");

 // Allocate frame
 m_frame = av_frame_alloc();
 if (!m_frame)
 throw std::runtime_error("[Decoder]: Error: Could not allocate frame");

 // Allocate packet
 m_packet = av_packet_alloc();
 if (!m_packet) 
 throw std::runtime_error("[Decoder]: Error: Could not allocate packet");

 //
 printf("[Decoder]: H264Decoder ready.\n");
}

H264Decoder::~H264Decoder()
{
 av_packet_free(&m_packet);
 av_frame_free(&m_frame);
 avcodec_free_context(&m_context);

 printf("[Decoder]: H264Decoder destroyed.\n");
}

bool H264Decoder::decode(uint8_t* data_, size_t size_, cv::Mat& img_)
{
 std::cout << "[Decoder]" << std::endl;
 std::cout << "[Decoder]: decoding " << size_ << " bytes of data" << std::endl;

 // Fill packet
 m_packet->data = data_;
 m_packet->size = size_;

 if (size_ == 0)
 return false;

 // Send packet to codec
 int send_result = avcodec_send_packet(m_context, m_packet);

 switch (send_result)
 {
 case 0:
 std::cout << "[Decoder]: Sent packet to codec" << std::endl;
 break;
 case AVERROR(EAGAIN):
 throw std::runtime_error("[Decoder]: avcodec_send_packet: EAGAIN");
 case AVERROR_EOF:
 throw std::runtime_error("[Decoder]: avcodec_send_packet: EOF");
 case AVERROR(EINVAL):
 throw std::runtime_error("[Decoder]: avcodec_send_packet: EINVAL");
 case AVERROR(ENOMEM):
 throw std::runtime_error("[Decoder]: avcodec_send_packet: ENOMEM");
 default:
 throw std::runtime_error("[Decoder]: avcodec_send_packet: UNKNOWN");
 }

 // Receive frame from codec
 int n_planes;
 uint8_t* output_data[1];
 int output_line_size[1];

 int receive_result = avcodec_receive_frame(m_context, m_frame);

 switch (receive_result)
 {
 case 0:
 n_planes = av_pix_fmt_count_planes((AVPixelFormat)m_frame->format);
 std::cout << "[Decoder]: Received Frame with dimensions " << m_frame->width << "x" << m_frame->height << "x" << n_planes << std::endl;
 for (int i=0; i/
 std::cout << "[Decoder]: Decoding complete" << std::endl;
 return true;
}
</stdexcept></iostream>

To test the two classes I put together a main.cpp to grab a frame, encode/decode and display the decoded frame (no network transmission in place) :


main.cpp


while(...)
{
 // get frame from custom camera class. Format is YUYV 4:2:2
 camera.getFrame(camera_frame);
 // Construct a cv::Mat to represent the grabbed frame
 cv::Mat camera_frame_yuyv = cv::Mat(camera_frame.height, camera_frame.width, CV_8UC2, camera_frame.data.data());
 // Encode image
 std::vector encoded_data = encoder.encode(camera_frame_yuyv);
 if (!encoded_data.empty())
 {
 // Decode image
 cv::Mat decoded_frame;
 if (decoder.decode(encoded_data.data(), encoded_data.size(), decoded_frame))
 {
 // Display image
 cv::imshow("Camera", decoded_frame);
 cv::waitKey(1);
 }
 }
}


Compiling and executing the code I get random results between subsequent executions :


- 

- Sometimes the whole loop runs without problems and I see the decoded image.
- Sometimes the program crashes at the
sws_scale(...)call in the decoder with"Assertion desc failed at src/libswscale/swscale_internal.h:757". - Sometimes the loop runs but I see a black image and the message
Slice parameters 0, 720 are invalidis displayed when executing thesws_scale(...)call in the decoder.








Why is the behaviour so random ? What am I doing wrong with the libav API ?


Some resources I found useful :


- 

- This article on encoding
- This article on decoding






-
Using FFmpeg encode and UDP with a Webcam ?
14 mars, par RendresI'm trying to get frames from a Webcam using OpenCV, encode them with FFmpeg and send them using UDP.


I did before a similar project that instead of sending the packets with UDP, it saved them in a video file.


My code is.


#include 
#include 
#include 
#include 

extern "C" {
#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libavutil></libavutil>opt.h>
#include <libavutil></libavutil>imgutils.h>
#include <libavutil></libavutil>mathematics.h>
#include <libswscale></libswscale>swscale.h>
#include <libswresample></libswresample>swresample.h>
}

#include <opencv2></opencv2>opencv.hpp>

using namespace std;
using namespace cv;

#define WIDTH 640
#define HEIGHT 480
#define CODEC_ID AV_CODEC_ID_H264
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P

static AVFrame *frame, *pFrameBGR;

int main(int argc, char **argv)
{
VideoCapture cap(0);
const char *url = "udp://127.0.0.1:8080";

AVFormatContext *formatContext;
AVStream *stream;
AVCodec *codec;
AVCodecContext *c;
AVDictionary *opts = NULL;

int ret, got_packet;

if (!cap.isOpened())
{
 return -1;
}

av_log_set_level(AV_LOG_TRACE);

av_register_all();
avformat_network_init();

avformat_alloc_output_context2(&formatContext, NULL, "h264", url);
if (!formatContext)
{
 av_log(NULL, AV_LOG_FATAL, "Could not allocate an output context for '%s'.\n", url);
}

codec = avcodec_find_encoder(CODEC_ID);
if (!codec)
{
 av_log(NULL, AV_LOG_ERROR, "Could not find encoder.\n");
}

stream = avformat_new_stream(formatContext, codec);

c = avcodec_alloc_context3(codec);

stream->id = formatContext->nb_streams - 1;
stream->time_base = (AVRational){1, 25};

c->codec_id = CODEC_ID;
c->bit_rate = 400000;
c->width = WIDTH;
c->height = HEIGHT;
c->time_base = stream->time_base;
c->gop_size = 12;
c->pix_fmt = STREAM_PIX_FMT;

if (formatContext->flags & AVFMT_GLOBALHEADER)
 c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

av_dict_set(&opts, "preset", "fast", 0);

av_dict_set(&opts, "tune", "zerolatency", 0);

ret = avcodec_open2(c, codec, NULL);
if (ret < 0)
{
 av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
}

pFrameBGR = av_frame_alloc();
if (!pFrameBGR)
{
 av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
}

frame = av_frame_alloc();
if (!frame)
{
 av_log(NULL, AV_LOG_ERROR, "Could not allocate video frame.\n");
}

frame->format = c->pix_fmt;
frame->width = c->width;
frame->height = c->height;

ret = avcodec_parameters_from_context(stream->codecpar, c);
if (ret < 0)
{
 av_log(NULL, AV_LOG_ERROR, "Could not open video codec.\n");
}

av_dump_format(formatContext, 0, url, 1);

ret = avformat_write_header(formatContext, NULL);
if (ret != 0)
{
 av_log(NULL, AV_LOG_ERROR, "Failed to connect to '%s'.\n", url);
}

Mat image(Size(HEIGHT, WIDTH), CV_8UC3);
SwsContext *swsctx = sws_getContext(WIDTH, HEIGHT, AV_PIX_FMT_BGR24, WIDTH, HEIGHT, AV_PIX_FMT_YUV420P, SWS_BILINEAR, NULL, NULL, NULL);
int frame_pts = 0;

while (1)
{
 cap >> image;

 int numBytesYUV = av_image_get_buffer_size(STREAM_PIX_FMT, WIDTH, HEIGHT, 1);
 uint8_t *bufferYUV = (uint8_t *)av_malloc(numBytesYUV * sizeof(uint8_t));

 avpicture_fill((AVPicture *)pFrameBGR, image.data, AV_PIX_FMT_BGR24, WIDTH, HEIGHT);
 avpicture_fill((AVPicture *)frame, bufferYUV, STREAM_PIX_FMT, WIDTH, HEIGHT);

 sws_scale(swsctx, (uint8_t const *const *)pFrameBGR->data, pFrameBGR->linesize, 0, HEIGHT, frame->data, frame->linesize);

 AVPacket pkt = {0};
 av_init_packet(&pkt);

 frame->pts = frame_pts;

 ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
 if (ret < 0)
 {
 av_log(NULL, AV_LOG_ERROR, "Error encoding frame\n");
 }

 if (got_packet)
 {
 pkt.pts = av_rescale_q_rnd(pkt.pts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 pkt.dts = av_rescale_q_rnd(pkt.dts, c->time_base, stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
 pkt.duration = av_rescale_q(pkt.duration, c->time_base, stream->time_base);
 pkt.stream_index = stream->index;

 return av_interleaved_write_frame(formatContext, &pkt);

 cout << "Seguro que si" << endl;
 }
 frame_pts++;
}

avcodec_free_context(&c);
av_frame_free(&frame);
avformat_free_context(formatContext);

return 0;
}


The code compiles but it returns Segmentation fault in the function av_interleaved_write_frame(). I've tried several implementations or several codecs (in this case I'm using libopenh264, but using mpeg2video returns the same segmentation fault). I tried also with av_write_frame() but it returns the same error.


As I told before, I only want to grab frames from a webcam connected via USB, encode them to H264 and send the packets through UDP to another PC.


My console log when I run the executable is.


[100%] Built target display
[OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::SetOption():ENCODER_OPTION_TRACE_CALLBACK callback = 0x7f0c302a87c0.
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:CWelsH264SVCEncoder::InitEncoder(), openh264 codec version = 5a5c4f1
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:iUsageType = 0,iPicWidth= 640;iPicHeight= 480;iTargetBitrate= 400000;iMaxBitrate= 400000;iRCMode= 0;iPaddingFlag= 0;iTemporalLayerNum= 1;iSpatialLayerNum= 1;fFrameRate= 25.000000f;uiIntraPeriod= 12;eSpsPpsIdStrategy = 0;bPrefixNalAddingCtrl = 0;bSimulcastAVC=0;bEnableDenoise= 0;bEnableBackgroundDetection= 1;bEnableSceneChangeDetect = 1;bEnableAdaptiveQuant= 1;bEnableFrameSkip= 0;bEnableLongTermReference= 0;iLtrMarkPeriod= 30, bIsLosslessLink=0;iComplexityMode = 0;iNumRefFrame = 1;iEntropyCodingModeFlag = 0;uiMaxNalSize = 0;iLTRRefNum = 0;iMultipleThreadIdc = 1;iLoopFilterDisableIdc = 0 (offset(alpha/beta): 0,0;iComplexityMode = 0,iMaxQp = 51;iMinQp = 0)
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:sSpatialLayers[0]: .iVideoWidth= 640; .iVideoHeight= 480; .fFrameRate= 25.000000f; .iSpatialBitrate= 400000; .iMaxSpatialBitrate= 400000; .sSliceArgument.uiSliceMode= 1; .sSliceArgument.iSliceNum= 0; .sSliceArgument.uiSliceSizeConstraint= 1500;uiProfileIdc = 66;uiLevelIdc = 41
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:SliceArgumentValidationFixedSliceMode(), unsupported setting with Resolution and uiSliceNum combination under RC on! So uiSliceNum is changed to 6!
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:Setting MaxSpatialBitrate (400000) the same at SpatialBitrate (400000) will make the actual bit rate lower than SpatialBitrate
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:bEnableFrameSkip = 0,bitrate can't be controlled for RC_QUALITY_MODE,RC_BITRATE_MODE and RC_TIMESTAMP_MODE without enabling skip frame.
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Warning:Change QP Range from(0,51) to (12,42)
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WELS CPU features/capacities (0x4007fe3f) detected: HTT: Y, MMX: Y, MMXEX: Y, SSE: Y, SSE2: Y, SSE3: Y, SSSE3: Y, SSE4.1: Y, SSE4.2: Y, AVX: Y, FMA: Y, X87-FPU: Y, 3DNOW: N, 3DNOWEX: N, ALTIVEC: N, CMOV: Y, MOVBE: Y, AES: Y, NUMBER OF LOGIC PROCESSORS ON CHIP: 8, CPU CACHE LINE SIZE (BYTES): 64
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt() exit, overall memory usage: 4542878 bytes
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Info:WelsInitEncoderExt(), pCtx= 0x0x245a400.
Output #0, h264, to 'udp://192.168.100.39:8080':
Stream #0:0, 0, 1/25: Video: h264 (libopenh264), 1 reference frame, yuv420p, 640x480 (0x0), 0/1, q=2-31, 400 kb/s, 25 tbn
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:RcUpdateIntraComplexity iFrameDqBits = 385808,iQStep= 2016,iIntraCmplx = 777788928
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:[Rc]Layer 0: Frame timestamp = 0, Frame type = 2, encoding_qp = 30, average qp = 30, max qp = 33, min qp = 27, index = 0, iTid = 0, used = 385808, bitsperframe = 16000, target = 64000, remainingbits = -257808, skipbuffersize = 200000
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerNum = 2,iFrameSize = 48252
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 0,iNalType = 0,iNalCount = 2, first Nal Length=18,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
[libopenh264 @ 0x244aa00] [OpenH264] this = 0x0x244b4f0, Debug:WelsEncoderEncodeExt() OutputInfo iLayerId = 1,iNalType = 1,iNalCount = 6, first Nal Length=6057,uiSpatialId = 0,uiTemporalId = 0,iSubSeqId = 0
[libopenh264 @ 0x244aa00] 6 slices
./scriptBuild.sh: line 20: 10625 Segmentation fault (core dumped) ./display


As you can see, FFmpeg uses libopenh264 and configures it correctly. However, no matter what. It always returns the same Segmentation fault error...


I've used commands like this.


ffmpeg -s 640x480 -f video4linux2 -i /dev/video0 -r 30 -vcodec libopenh264 -an -f h264 udp://127.0.0.1:8080


And it works perfectly, but I need to process the frames before sending them. Thats why I'm trying to use the libs.


My FFmpeg version is.


ffmpeg version 3.3.6 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --disable-yasm --enable-shared --enable-libopenh264 --cc='gcc -fPIC'
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100


I tried to get more information of the error using gbd, but it didn't give me debugging info.


How can I solve this problem ?


-
Piping yt_dlp to FFMPEG using python : ffmpeg failing to recognize video data from pipe
19 juillet 2024, par ThePrinceI am trying to pipe the output of yt_dlp into a pipe used by ffmpeg which then outputs. :


def pipe_function(url):

ydl_command = [
 'yt-dlp', '-f', 'bestvideo+bestaudio', '--quiet', '--no-warnings', '-o', '-', url
]


ffmpeg_command = [
 'ffmpeg', '-v', 'debug', '-i', '-', '-c', 'copy', 'output.mp4'
]


# Start yt-dlp process
ydl_process = subprocess.Popen(
 ydl_command,
 stdout=subprocess.PIPE,
 stderr=subprocess.PIPE
)


# Start ffmpeg process and pipe output from yt-dlp to ffmpeg
ffmpeg_process = subprocess.Popen(
 ffmpeg_command,
 stdin=ydl_process.stdout,
 stdout=subprocess.PIPE,
 stderr=subprocess.PIPE
)



ydl_stdout, ydl_stderr = ydl_process.communicate()


try:
 print(ydl_stdout[:100].decode('utf-8'))
except UnicodeDecodeError:
 print(ydl_stdout[:100].decode('latin-1', errors='ignore'))

ffmpeg_stdout, ffmpeg_stderr = ffmpeg_process.communicate()


if ydl_stderr:
 try:
 print("error in yt-dlp: ", ydl_stderr.decode('utf-8'))
 except UnicodeDecodeError:
 print("decode error in yt-dlp: ", ydl_stderr)

if ffmpeg_stderr:
 try:
 print("error in ffmpeg: ", ffmpeg_stderr.decode('utf-8'))
 except UnicodeDecodeError:
 print("decode error in ffmpeg: ", ffmpeg_stderr)


try:
 print(ffmpeg_stdout[:100].decode('utf-8'))
except UnicodeDecodeError:
 print(ffmpeg_stdout[:100].decode('latin-1', errors='ignore'))

return ffmpeg_stdout


This outputs an audio file. If I look at the console I see some messages. I have removed the lengthier stuff and shown only what I find the most interesting :


[mpegts @ 0000021b8576a380] probing stream 0 pp:1457
[mpegts @ 0000021b8576a380] probed stream 0
[mpegts @ 0000021b8576a380] parser not found for codec bin_data, packets or times may be invalid.
For transform of length 120, inverse, mdct_float, flags: [aligned, out_of_place], found 6 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_pfa_15xM_inv_float_c - type: mdct_float, len: [30, ∞], factors[2]: [15, any], flags: [unaligned, out_of_place, inv_only], prio: 304
 3: mdct_pfa_5xM_inv_float_c - type: mdct_float, len: [10, ∞], factors[2]: [5, any], flags: [unaligned, out_of_place, inv_only], prio: 144
 4: mdct_pfa_3xM_inv_float_c - type: mdct_float, len: [6, ∞], factors[2]: [3, any], flags: [unaligned, out_of_place, inv_only], prio: 112
 5: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 6: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 60, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 1 matches:
 1: fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: [60, ∞], factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 688
For transform of length 4, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 1 matches:
 1: fft4_fwd_asm_float_sse2 - type: fft_float, len: 4, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 352
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 120, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: 60, factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call]
 fft4_fwd_asm_float_sse2 - type: fft_float, len: 4, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 128, inverse, mdct_float, flags: [aligned, out_of_place], found 3 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 3: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 64, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 3 matches:
 1: fft_sr_asm_float_avx2 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
 2: fft_sr_asm_float_fma3 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 448
 3: fft_sr_asm_float_avx - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 416
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 128, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_sr_asm_float_avx2 - type: fft_float, len: 64, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 480, inverse, mdct_float, flags: [aligned, out_of_place], found 6 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_pfa_15xM_inv_float_c - type: mdct_float, len: [30, ∞], factors[2]: [15, any], flags: [unaligned, out_of_place, inv_only], prio: 304
 3: mdct_pfa_5xM_inv_float_c - type: mdct_float, len: [10, ∞], factors[2]: [5, any], flags: [unaligned, out_of_place, inv_only], prio: 144
 4: mdct_pfa_3xM_inv_float_c - type: mdct_float, len: [6, ∞], factors[2]: [3, any], flags: [unaligned, out_of_place, inv_only], prio: 112
 5: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 6: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 240, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 1 matches:
 1: fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: [60, ∞], factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 688
For transform of length 16, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 2 matches:
 1: fft16_asm_float_fma3 - type: fft_float, len: 16, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 512
 2: fft16_asm_float_avx - type: fft_float, len: 16, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 480, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: 240, factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call]
 fft16_asm_float_fma3 - type: fft_float, len: 16, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 512, inverse, mdct_float, flags: [aligned, out_of_place], found 3 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 3: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 256, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 3 matches:
 1: fft_sr_asm_float_avx2 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
 2: fft_sr_asm_float_fma3 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 448
 3: fft_sr_asm_float_avx - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 416
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 512, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_sr_asm_float_avx2 - type: fft_float, len: 256, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 960, inverse, mdct_float, flags: [aligned, out_of_place], found 6 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_pfa_15xM_inv_float_c - type: mdct_float, len: [30, ∞], factors[2]: [15, any], flags: [unaligned, out_of_place, inv_only], prio: 304
 3: mdct_pfa_5xM_inv_float_c - type: mdct_float, len: [10, ∞], factors[2]: [5, any], flags: [unaligned, out_of_place, inv_only], prio: 144
 4: mdct_pfa_3xM_inv_float_c - type: mdct_float, len: [6, ∞], factors[2]: [3, any], flags: [unaligned, out_of_place, inv_only], prio: 112
 5: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 6: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 480, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 1 matches:
 1: fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: [60, ∞], factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 688
For transform of length 32, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 2 matches:
 1: fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 512
 2: fft32_asm_float_avx - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 960, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_pfa_15xM_asm_float_avx2 - type: fft_float, len: 480, factors[2]: [15, 2], flags: [aligned, inplace, out_of_place, preshuf, asm_call]
 fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 1024, inverse, mdct_float, flags: [aligned, out_of_place], found 3 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 3: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 512, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 3 matches:
 1: fft_sr_asm_float_avx2 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
 2: fft_sr_asm_float_fma3 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 448
 3: fft_sr_asm_float_avx - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 416
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 1024, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft_sr_asm_float_avx2 - type: fft_float, len: 512, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 1024, forward, mdct_float, flags: [aligned, out_of_place], found 2 matches:
 1: mdct_fwd_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, fwd_only], prio: 96
 2: mdct_naive_fwd_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, fwd_only], prio: -130976
For transform of length 512, forward, fft_float, flags: [aligned, inplace, preshuf], found 5 matches:
 1: fft_sr_ns_float_avx2 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf], prio: 480
 2: fft_sr_ns_float_fma3 - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf], prio: 448
 3: fft_sr_ns_float_avx - type: fft_float, len: [64, 131072], factor: 2, flags: [aligned, inplace, out_of_place, preshuf], prio: 416
 4: fft_pfa_ns_float_c - type: fft_float, len: [6, ∞], factors[2]: [7, 5, 3, 2, any], flags: [unaligned, inplace, out_of_place, preshuf], prio: 112
 5: fft512_ns_float_c - type: fft_float, len: 512, factor: 2, flags: [unaligned, inplace, out_of_place, preshuf], prio: 96
Transform tree:
 mdct_fwd_float_c - type: mdct_float, len: 1024, factors[2]: [2, any], flags: [unaligned, out_of_place, fwd_only]
 fft_sr_ns_float_avx2 - type: fft_float, len: 512, factor: 2, flags: [aligned, inplace, out_of_place, preshuf]
For transform of length 64, inverse, mdct_float, flags: [aligned, out_of_place], found 3 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 3: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 32, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 2 matches:
 1: fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 512
 2: fft32_asm_float_avx - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 64, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
For transform of length 64, inverse, mdct_float, flags: [aligned, out_of_place], found 3 matches:
 1: mdct_inv_float_avx2 - type: mdct_float, len: [16, ∞], factors[2]: [2, any], flags: [aligned, out_of_place, inv_only], prio: 544
 2: mdct_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: 96
 3: mdct_naive_inv_float_c - type: mdct_float, len: [2, ∞], factors[2]: [2, any], flags: [unaligned, out_of_place, inv_only], prio: -130976
For transform of length 32, inverse, fft_float, flags: [aligned, inplace, preshuf, asm_call], found 2 matches:
 1: fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 512
 2: fft32_asm_float_avx - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call], prio: 480
Transform tree:
 mdct_inv_float_avx2 - type: mdct_float, len: 64, factors[2]: [2, any], flags: [aligned, out_of_place, inv_only]
 fft32_asm_float_fma3 - type: fft_float, len: 32, factor: 2, flags: [aligned, inplace, out_of_place, preshuf, asm_call]
[mpegts @ 0000021b8576a380] max_analyze_duration 5000000 reached at 5005000 microseconds st:0
[mpegts @ 0000021b8576a380] After avformat_find_stream_info() pos: 5403308 bytes read:5404624 seeks:0 frames:365
Input #0, mpegts, from 'fd:':
 Duration: N/A, start: 1.400000, bitrate: 130 kb/s
 Program 1
 Metadata:
 service_name : Service01
 service_provider: FFmpeg
 Stream #0:0[0x100], 152, 1/90000: Data: bin_data ([6][0][0][0] / 0x0006), 0/1
 Stream #0:1[0x101](und), 213, 1/90000: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, 130 kb/s
Successfully opened the file.
Parsing a group of options: output url output.mp4.
Applying option c (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: output.mp4.
[out#0/mp4 @ 0000021b89b251c0] No explicit maps, mapping streams automatically...
[aost#0:0/copy @ 0000021b89b8d800] Created audio stream from input stream 0:1
[file @ 0000021b89586680] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
Stream mapping:
 Stream #0:1 -> #0:0 (copy)
Output #0, mp4, to 'output.mp4':
 Metadata:
 encoder : Lavf60.20.100
 Stream #0:0(und), 0, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
[out#0/mp4 @ 0000021b89b251c0] Starting thread...
[in#0/mpegts @ 0000021b85724080] Starting thread...
Automatically inserted bitstream filter 'aac_adtstoasc'; args=''
[in#0/mpegts @ 0000021b85724080] EOF while reading inputpeed= 40x
[in#0/mpegts @ 0000021b85724080] Terminating thread with return code 0 (success)
[out#0/mp4 @ 0000021b89b251c0] All streams finished
[out#0/mp4 @ 0000021b89b251c0] Terminating thread with return code 0 (success)
[AVIOContext @ 0000021b87146340] Statistics: 2723207 bytes written, 2 seeks, 14 writeouts
[out#0/mp4 @ 0000021b89b251c0] Output file #0 (output.mp4):
[out#0/mp4 @ 0000021b89b251c0] Output stream #0:0 (audio): 7232 packets muxed (2737451 bytes);
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
 Metadata:
 encoder : Lavf60.20.100
 Stream #0:0(und), 0, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s
[out#0/mp4 @ 0000021b89b251c0] Starting thread...
[in#0/mpegts @ 0000021b85724080] Starting thread...
Automatically inserted bitstream filter 'aac_adtstoasc'; args=''
[in#0/mpegts @ 0000021b85724080] EOF while reading inputpeed= 40x
[in#0/mpegts @ 0000021b85724080] Terminating thread with return code 0 (success)
[out#0/mp4 @ 0000021b89b251c0] All streams finished
[out#0/mp4 @ 0000021b89b251c0] Terminating thread with return code 0 (success)
[AVIOContext @ 0000021b87146340] Statistics: 2723207 bytes written, 2 seeks, 14 writeouts
[out#0/mp4 @ 0000021b89b251c0] Output file #0 (output.mp4):
[out#0/mp4 @ 0000021b89b251c0] Output stream #0:0 (audio): 7232 packets muxed (2737451 bytes);
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[in#0/mpegts @ 0000021b85724080] Starting thread...
Automatically inserted bitstream filter 'aac_adtstoasc'; args=''
[in#0/mpegts @ 0000021b85724080] EOF while reading inputpeed= 40x
[in#0/mpegts @ 0000021b85724080] Terminating thread with return code 0 (success)
[out#0/mp4 @ 0000021b89b251c0] All streams finished
[out#0/mp4 @ 0000021b89b251c0] Terminating thread with return code 0 (success)
[AVIOContext @ 0000021b87146340] Statistics: 2723207 bytes written, 2 seeks, 14 writeouts
[out#0/mp4 @ 0000021b89b251c0] Output file #0 (output.mp4):
[out#0/mp4 @ 0000021b89b251c0] Output stream #0:0 (audio): 7232 packets muxed (2737451 bytes);
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[out#0/mp4 @ 0000021b89b251c0] All streams finished
[out#0/mp4 @ 0000021b89b251c0] Terminating thread with return code 0 (success)
[AVIOContext @ 0000021b87146340] Statistics: 2723207 bytes written, 2 seeks, 14 writeouts
[out#0/mp4 @ 0000021b89b251c0] Output file #0 (output.mp4):
[out#0/mp4 @ 0000021b89b251c0] Output stream #0:0 (audio): 7232 packets muxed (2737451 bytes);
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[out#0/mp4 @ 0000021b89b251c0] Output file #0 (output.mp4):
[out#0/mp4 @ 0000021b89b251c0] Output stream #0:0 (audio): 7232 packets muxed (2737451 bytes);
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[out#0/mp4 @ 0000021b89b251c0] Total: 7232 packets (2737451 bytes) muxed
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[out#0/mp4 @ 0000021b89b251c0] video:0kB audio:2673kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[in#0/mpegts @ 0000021b85724080] Input file #0 (fd:):
size= 2659kB time=00:02:47.92 bitrate= 129.7kbits/s speed=41.3x
[in#0/mpegts @ 0000021b85724080] Input file #0 (fd:):
[in#0/mpegts @ 0000021b85724080] Input file #0 (fd:):
[in#0/mpegts @ 0000021b85724080] Input stream #0:1 (audio): 7232 packets read (2737451 bytes);
[in#0/mpegts @ 0000021b85724080] Total: 7232 packets (2737451 bytes) demuxed
[AVIOContext @ 0000021b85744880] Statistics: 27226912 bytes read, 0 seeks


It seems to me that the video data is being interpreted as bin_data and no codec is found for it. What is going on here ?


Must YT_DLP data be converted to some other format before being read by FFMPEG ?


Thank you.


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