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The pirate bay depuis la Belgique
1er avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
Autres articles (72)
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Sur d’autres sites (8954)
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SegFault while freeing nvenc hwdevice_ctx
23 février 2024, par camelCaseFor a project, I created a class encoding the output of an OpenGL
renderbufferobject usingh264_nvenc. Unfortunately, tidying up doesn't work, and the program crashes with a SegFault. The reason is accessing an unaccessable memory region, happening twice in the final lines (see below) when callingav_buffer_unref( &_hwDeviceRefCtx )and implicitely also duringavcodec_free_context( &_pCodecCtx ), but both calls are required for shutting down.

The (in this case relevant)
valgrind-output is

Invalid read of size 8
 at 0x48AD987: UnknownInlinedFun (buffer.c:121)
 by 0x48AD987: UnknownInlinedFun (buffer.c:144)
 by 0x48AD987: av_buffer_unref (buffer.c:139)
 by 0x5D06D7A: avcodec_close (avcodec.c:486)
 by 0x628DD7D: avcodec_free_context (options.c:175)
 by 0x10A863: main (main.cpp:115)
 Address 0x17812700 is 0 bytes inside a block of size 24 free'd
 at 0x484488F: free (vg_replace_malloc.c:985)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:127)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:144)
 by 0x48AD98F: av_buffer_unref (buffer.c:139)
 by 0x48BE098: hwframe_ctx_free (hwcontext.c:240)
 by 0x48AD9A6: UnknownInlinedFun (buffer.c:133)
 by 0x48AD9A6: UnknownInlinedFun (buffer.c:144)
 by 0x48AD9A6: av_buffer_unref (buffer.c:139)
 by 0x5D06D0A: UnknownInlinedFun (decode.c:1261)
 by 0x5D06D0A: avcodec_close (avcodec.c:465)
 by 0x628DD7D: avcodec_free_context (options.c:175)
 by 0x10A863: main (main.cpp:115)
 Block was alloc'd at
 at 0x4849366: posix_memalign (vg_replace_malloc.c:2099)
 by 0x48D9BD5: av_malloc (mem.c:105)
 by 0x48D9DAD: av_mallocz (mem.c:256)
 by 0x48AD8DD: UnknownInlinedFun (buffer.c:44)
 by 0x48AD8DD: av_buffer_create (buffer.c:64)
 by 0x48BDDEB: av_hwdevice_ctx_alloc (hwcontext.c:179)
 by 0x48BDF29: av_hwdevice_ctx_create (hwcontext.c:622)
 by 0x10A482: main (main.cpp:43)

Invalid free() / delete / delete[] / realloc()
 at 0x484488F: free (vg_replace_malloc.c:985)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:127)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:144)
 by 0x48AD98F: av_buffer_unref (buffer.c:139)
 by 0x5D06D7A: avcodec_close (avcodec.c:486)
 by 0x628DD7D: avcodec_free_context (options.c:175)
 by 0x10A863: main (main.cpp:115)
 Address 0x17812700 is 0 bytes inside a block of size 24 free'd
 at 0x484488F: free (vg_replace_malloc.c:985)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:127)
 by 0x48AD98F: UnknownInlinedFun (buffer.c:144)
 by 0x48AD98F: av_buffer_unref (buffer.c:139)
 by 0x48BE098: hwframe_ctx_free (hwcontext.c:240)
 by 0x48AD9A6: UnknownInlinedFun (buffer.c:133)
 by 0x48AD9A6: UnknownInlinedFun (buffer.c:144)
 by 0x48AD9A6: av_buffer_unref (buffer.c:139)
 by 0x5D06D0A: UnknownInlinedFun (decode.c:1261)
 by 0x5D06D0A: avcodec_close (avcodec.c:465)
 by 0x628DD7D: avcodec_free_context (options.c:175)
 by 0x10A863: main (main.cpp:115)
 Block was alloc'd at
 at 0x4849366: posix_memalign (vg_replace_malloc.c:2099)
 by 0x48D9BD5: av_malloc (mem.c:105)
 by 0x48D9DAD: av_mallocz (mem.c:256)
 by 0x48AD8DD: UnknownInlinedFun (buffer.c:44)
 by 0x48AD8DD: av_buffer_create (buffer.c:64)
 by 0x48BDDEB: av_hwdevice_ctx_alloc (hwcontext.c:179)
 by 0x48BDF29: av_hwdevice_ctx_create (hwcontext.c:622)
 by 0x10A482: main (main.cpp:43)


that is also duplicated (due to the calls to
avcodec_free_context()andav_buffer_unref()).

The question is : How can I fix this ?


The (more or less) minimal (not) working example reads


#include <string>

extern "C" {
 #include <libavutil></libavutil>opt.h>
 #include <libavcodec></libavcodec>avcodec.h>
 #include <libavformat></libavformat>avformat.h>
 #include <libavutil></libavutil>hwcontext.h>
 #include <libavutil></libavutil>pixdesc.h>
 #include <libavutil></libavutil>hwcontext_cuda.h>
}

//(former) libx264 encoding based on https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/muxing.c
//update to h264_nvenc with a lot of help from https://stackoverflow.com/questions/49862610/opengl-to-ffmpeg-encode
//and some additional info of https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_encode.c

int main() {
 const int _SrcImageWidth=640;
 const int _SrcImageHeight=480;
 
 const AVOutputFormat *_oFmt = nullptr;
 AVFormatContext *_oFmtCtx = nullptr;
 
 const AVCodec *_pCodec = nullptr;
 AVCodecContext *_pCodecCtx = nullptr;
 
 AVFrame* _frame;
 AVPacket* _packet;
 AVStream* _stream;
 
 AVBufferRef *_hwDeviceRefCtx = nullptr;
 const CUcontext* _cudaCtx;
 
 const std::string _OutFileName = "output.mkv";
 
 //constructor part
 int ret;

 //output format context 
 avformat_alloc_output_context2( &_oFmtCtx, nullptr, nullptr, _OutFileName.c_str() );
 _oFmt = _oFmtCtx->oformat;

 //hardware format context
 ret = av_hwdevice_ctx_create( &_hwDeviceRefCtx, AV_HWDEVICE_TYPE_CUDA, "NVIDIA GeForce RTX 4070", nullptr, 0 );

 //hardware frame context for device buffer allocation
 AVBufferRef* hwFrameRefCtx = av_hwframe_ctx_alloc( _hwDeviceRefCtx );
 AVHWFramesContext* hwFrameCtx = (AVHWFramesContext*) (hwFrameRefCtx->data);
 hwFrameCtx->width = _SrcImageWidth;
 hwFrameCtx->height = _SrcImageHeight;
 hwFrameCtx->sw_format = AV_PIX_FMT_0BGR32;
 hwFrameCtx->format = AV_PIX_FMT_CUDA;
 hwFrameCtx->device_ref = _hwDeviceRefCtx;
 hwFrameCtx->device_ctx = (AVHWDeviceContext*) _hwDeviceRefCtx->data;

 ret = av_hwframe_ctx_init( hwFrameRefCtx );

 //get cuda context
 const AVHWDeviceContext* hwDeviceCtx = (AVHWDeviceContext*)(_hwDeviceRefCtx->data);
 const AVCUDADeviceContext* cudaDeviceCtx = (AVCUDADeviceContext*)(hwDeviceCtx->hwctx);
 _cudaCtx = &(cudaDeviceCtx->cuda_ctx);

 //codec context
 _pCodec = avcodec_find_encoder_by_name( "h264_nvenc" );

 _packet = av_packet_alloc();

 _stream = avformat_new_stream( _oFmtCtx, nullptr );
 _stream->id = _oFmtCtx->nb_streams - 1;
 _pCodecCtx = avcodec_alloc_context3( _pCodec );

 _pCodecCtx->qmin = 18;
 _pCodecCtx->qmax = 20;
 _pCodecCtx->width = _SrcImageWidth;
 _pCodecCtx->height = _SrcImageHeight;
 _pCodecCtx->framerate = (AVRational) {25,1};
 _pCodecCtx->time_base = (AVRational) {1,25};
 _stream->time_base = _pCodecCtx->time_base;
 _pCodecCtx->gop_size = 12; //I-Frame every at most 12 frames
 _pCodecCtx->max_b_frames = 2;
 _pCodecCtx->pix_fmt = AV_PIX_FMT_CUDA; //required to use renderbuffer as src
 _pCodecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
 _pCodecCtx->sw_pix_fmt = AV_PIX_FMT_0BGR32; 
 _pCodecCtx->hw_device_ctx = _hwDeviceRefCtx;
 _pCodecCtx->hw_frames_ctx = av_buffer_ref( hwFrameRefCtx );
 av_opt_set(_pCodecCtx->priv_data, "preset", "p7", 0);
 av_opt_set(_pCodecCtx->priv_data, "rc", "vbr", 0);
 if( _oFmtCtx->oformat->flags & AVFMT_GLOBALHEADER ) {
 _pCodecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
 }

 ret = avcodec_open2( _pCodecCtx, _pCodec, nullptr );
 avcodec_parameters_from_context( _stream->codecpar, _pCodecCtx );

 if (!(_oFmtCtx->oformat->flags & AVFMT_NOFILE)) {
 ret = avio_open(&_oFmtCtx->pb, _OutFileName.c_str(), AVIO_FLAG_WRITE);
 }
 ret = avformat_write_header( _oFmtCtx, nullptr );

 //use hardware frame from above
 _frame = av_frame_alloc();
 ret = av_hwframe_get_buffer( _pCodecCtx->hw_frames_ctx, _frame, 0 );
 _frame->pts = 1;

 av_buffer_unref( &hwFrameRefCtx );

 //destructor part
 av_frame_free( &_frame );
 av_packet_free( &_packet );

 av_write_trailer( _oFmtCtx );
 avio_closep( &_oFmtCtx->pb );

 avformat_free_context( _oFmtCtx );

 avcodec_free_context( &_pCodecCtx );
 av_buffer_unref( &_hwDeviceRefCtx );

 return 0;
}
</string>

and compiles with (linux user)


g++ -lavutil -lavformat -lavcodec -lz -lavutil -lswscale -lswresample -lm -ggdb3 -I/opt/cuda/include main.cpp


Thanks in advance !


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ffmpeg piped output producing incorrect metadata frame count with Python
6 décembre 2024, par XorgonUsing Python, I am attempting to use ffmpeg to compress videos and put them in a PowerPoint. This works great, however, the video files themselves have incorrect frame counts which can cause issues when I read from those videos in other code.


Edit for clarification : by "frame count" I mean the metadata frame count. The actual number of frames contained in the video is correct, but querying the metadata gives an incorrect frame count.


Having eliminated the PowerPoint aspect of the code, I've narrowed this down to the following minimal reproducing example of saving an output from an ffmpeg pipe :


from subprocess import Popen, PIPE

video_path = 'test_mp4.mp4'

ffmpeg_pipe = Popen(['ffmpeg',
 '-y', # Overwrite files
 '-i', f'{video_path}', # Input from file
 '-f', 'avi', # Output format
 '-c:v', 'libx264', # Codec
 '-'], # Output to pipe
 stdout=PIPE)

new_path = "piped_video.avi"
vid_file = open(new_path, "wb")
vid_file.write(ffmpeg_pipe.stdout.read())
vid_file.close()


I've tested several different videos. One small example video that I've tested can be found here.


I've tried a few different codecs with
aviformat and triedlibvpxwithwebmformat. For theavioutputs, the frame count usually reads as1073741824(2^30). Weirdly, for thewebmformat, the frame count read as-276701161105643264.

This is a snippet I used to read the frame count, but one could also see the error by opening the video details in Windows Explorer and seeing the total time as something like 9942 hours, 3 minutes, and 14 seconds.


import cv2

video_path = 'test_mp4.mp4'
new_path = "piped_video.webm"

cap = cv2.VideoCapture(video_path)
print(f"Original video frame count: = {int(cap.get(cv2.CAP_PROP_FRAME_COUNT)):d}")
cap.release()

cap = cv2.VideoCapture(new_path)
print(f"Piped video frame count: = {int(cap.get(cv2.CAP_PROP_FRAME_COUNT)):d}")
cap.release()


For completeness, here is the ffmpeg output :


ffmpeg version 2023-06-11-git-09621fd7d9-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
 built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 58. 13.100 / 58. 13.100
 libavcodec 60. 17.100 / 60. 17.100
 libavformat 60. 6.100 / 60. 6.100
 libavdevice 60. 2.100 / 60. 2.100
 libavfilter 9. 8.101 / 9. 8.101
 libswscale 7. 3.100 / 7. 3.100
 libswresample 4. 11.100 / 4. 11.100
 libpostproc 57. 2.100 / 57. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_mp4.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 creation_time : 2022-08-10T12:54:09.000000Z
 Duration: 00:00:06.67, start: 0.000000, bitrate: 567 kb/s
 Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 384x264 [SAR 1:1 DAR 16:11], 563 kb/s, 30 fps, 30 tbr, 30k tbn (default)
 Metadata:
 creation_time : 2022-08-10T12:54:09.000000Z
 handler_name : Mainconcept MP4 Video Media Handler
 vendor_id : [0][0][0][0]
 encoder : AVC Coding
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0000018c68c8b9c0] using SAR=1/1
[libx264 @ 0000018c68c8b9c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000018c68c8b9c0] profile High, level 2.1, 4:2:0, 8-bit
Output #0, avi, to 'pipe:':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 ISFT : Lavf60.6.100
 Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p(progressive), 384x264 [SAR 1:1 DAR 16:11], q=2-31, 30 fps, 30 tbn (default)
 Metadata:
 creation_time : 2022-08-10T12:54:09.000000Z
 handler_name : Mainconcept MP4 Video Media Handler
 vendor_id : [0][0][0][0]
 encoder : Lavc60.17.100 libx264
 Side data:
 cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[out#0/avi @ 0000018c687f47c0] video:82kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.631060%
frame= 200 fps=0.0 q=-1.0 Lsize= 85kB time=00:00:06.56 bitrate= 106.5kbits/s speed=76.2x 
[libx264 @ 0000018c68c8b9c0] frame I:1 Avg QP:16.12 size: 3659
[libx264 @ 0000018c68c8b9c0] frame P:80 Avg QP:21.31 size: 647
[libx264 @ 0000018c68c8b9c0] frame B:119 Avg QP:26.74 size: 243
[libx264 @ 0000018c68c8b9c0] consecutive B-frames: 3.0% 53.0% 0.0% 44.0%
[libx264 @ 0000018c68c8b9c0] mb I I16..4: 17.6% 70.6% 11.8%
[libx264 @ 0000018c68c8b9c0] mb P I16..4: 0.8% 1.7% 0.6% P16..4: 17.6% 4.6% 3.3% 0.0% 0.0% skip:71.4%
[libx264 @ 0000018c68c8b9c0] mb B I16..4: 0.1% 0.3% 0.2% B16..8: 11.7% 1.4% 0.4% direct: 0.6% skip:85.4% L0:32.0% L1:59.7% BI: 8.3%
[libx264 @ 0000018c68c8b9c0] 8x8 transform intra:59.6% inter:62.4%
[libx264 @ 0000018c68c8b9c0] coded y,uvDC,uvAC intra: 48.5% 0.0% 0.0% inter: 3.5% 0.0% 0.0%
[libx264 @ 0000018c68c8b9c0] i16 v,h,dc,p: 19% 39% 25% 17%
[libx264 @ 0000018c68c8b9c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 25% 30% 3% 3% 4% 4% 4% 5%
[libx264 @ 0000018c68c8b9c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 20% 16% 6% 8% 8% 8% 5% 6%
[libx264 @ 0000018c68c8b9c0] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 0000018c68c8b9c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000018c68c8b9c0] ref P L0: 76.2% 7.9% 11.2% 4.7%
[libx264 @ 0000018c68c8b9c0] ref B L0: 85.6% 12.9% 1.5%
[libx264 @ 0000018c68c8b9c0] ref B L1: 97.7% 2.3%
[libx264 @ 0000018c68c8b9c0] kb/s:101.19


So the question is : why does this happen, and how can one avoid it ?


-
Using libav to encode RGBA frames into MP4 but the output is a mess
5 octobre 2019, par Cu2SI’m trying to decode a video into RGB frames, and then postprocess the frames, finally encode the frames into a video. But the output video is completely a mess :
I wrote a minimal example to illustrate my idea. First, I read some information from some source video :
AVFormatContext* inputFormatCtx = nullptr;
int ret = avformat_open_input(&inputFormatCtx, inputParamsVideo, nullptr, nullptr);
assert(ret >= 0);
ret = avformat_find_stream_info(inputFormatCtx, NULL);
av_dump_format(inputFormatCtx, 0, inputParamsVideo, 0);
assert(ret >= 0);
AVStream* inputVideoStream = nullptr;
for (int i = 0; i < inputFormatCtx->nb_streams; i++)
{
const auto inputStream = inputFormatCtx->streams[i];
if (inputStream->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
inputVideoStream = inputStream;
break;
}
}
assert(inputVideoStream != nullptr);
AVCodecParameters* inputParams = inputVideoStream->codecpar;
AVRational framerate = inputVideoStream->codec->framerate;
auto gop_size = inputVideoStream->codec->gop_size;
auto maxBFrames = inputVideoStream->codec->max_b_frames;Then I assign the information to the output stream :
AVFormatContext *outputAVFormat = nullptr;
avformat_alloc_output_context2(&outputAVFormat, nullptr, nullptr, kOutputPath);
assert(outputAVFormat);
AVCodec* codec = avcodec_find_encoder(outputAVFormat->oformat->video_codec);
assert(codec);
AVCodecContext* encodingCtx = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(encodingCtx, inputParams);
encodingCtx->time_base = av_inv_q(framerate);
encodingCtx->max_b_frames = maxBFrames;
encodingCtx->gop_size = gop_size;
if (outputAVFormat->oformat->flags & AVFMT_GLOBALHEADER)
encodingCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
AVStream* outStream = avformat_new_stream(outputAVFormat, nullptr);
assert(outStream != nullptr);
ret = avcodec_parameters_from_context(outStream->codecpar, encodingCtx);
assert(ret >= 0);
outStream->time_base = encodingCtx->time_base;Then I convert RGBA frames(which is read from files) into YUV420P via
sws_scale, and encoding :ret = avcodec_open2(encodingCtx, codec, nullptr);
assert(ret >= 0);
av_dump_format(outputAVFormat, 0, kOutputPath, 1);
ret = avio_open(&outputAVFormat->pb, kOutputPath, AVIO_FLAG_WRITE);
assert(ret >= 0);
ret = avformat_write_header(outputAVFormat, nullptr);
assert(ret >= 0);
AVFrame* frame = av_frame_alloc();
frame->width = inputParams->width;
frame->height = inputParams->height;
frame->format = inputParams->format;
frame->pts = 0;
assert(ret >= 0);
ret = av_frame_get_buffer(frame, 32);
int frameCount = 0;
assert(ret >= 0);
ret = av_frame_make_writable(frame);
assert(ret >= 0);
SwsContext* swsContext = sws_getContext(inputParams->width, inputParams->height,
AV_PIX_FMT_RGBA, frame->width,
frame->height, static_cast<avpixelformat>(inputParams->format),
SWS_BILINEAR, NULL, NULL, NULL);
for (auto inputPicPath : std::filesystem::directory_iterator(kInputDir))
{
int width, height, comp;
unsigned char* data = stbi_load(inputPicPath.path().string().c_str(), &width, &height, &comp, 4);
int srcStrides[1] = { 4 * width };
int ret = sws_scale(swsContext, &data, srcStrides, 0, height, frame->data,
frame->linesize);
assert(ret >= 0);
frame->pts = frameCount;
//frame->pict_type = AV_PICTURE_TYPE_I;
frameCount += 1;
encode(encodingCtx, frame, 0, outputAVFormat);
stbi_image_free(data);
}
while (encode(encodingCtx, nullptr, 0, outputAVFormat))
{
;
}
static bool encode(AVCodecContext* enc_ctx, AVFrame* frame, std::uint32_t streamIndex,
AVFormatContext * formatCtx)
{
int ret;
int got_output = 0;
AVPacket packet = {};
av_init_packet(&packet);
ret = avcodec_encode_video2(enc_ctx, &packet, frame, &got_output);
assert(ret >= 0);
if (got_output) {
packet.stream_index = streamIndex;
av_packet_rescale_ts(&packet, enc_ctx->time_base, formatCtx->streams[streamIndex]->time_base);
ret = av_interleaved_write_frame(formatCtx, &packet);
assert(ret >= 0);
return true;
}
else {
return false;
}
}
</avpixelformat>Finally I cleaned up stuff :
av_write_trailer(outputAVFormat);
sws_freeContext(swsContext);
avcodec_free_context(&encodingCtx);
avio_closep(&outputAVFormat->pb);
avformat_free_context(outputAVFormat);
av_frame_free(&frame);I dumped my input format and my output format :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'H:\Me.MP4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
creation_time : 2019-04-03T05:44:22.000000Z
Duration: 00:00:06.90, start: 0.000000, bitrate: 1268 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, 1238 kb/s, 29.86 fps, 30 tbr, 600 tbn, 1200 tbc (default)
Metadata:
creation_time : 2019-04-03T05:44:22.000000Z
handler_name : Core Media Video
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, stereo, fltp, 24 kb/s (default)
Metadata:
creation_time : 2019-04-03T05:44:22.000000Z
handler_name : Core Media Audio
[libx264 @ 000002126F90C1C0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000002126F90C1C0] profile High, level 3.1, 4:2:0, 8-bit
[libx264 @ 000002126F90C1C0] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=12 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=12 rc=abr mbtree=1 bitrate=1238 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to './output.mp4':
Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 540x960, q=2-31, 1238 kb/s, 29.86 tbnUpdate :
After I deleted
encodingCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;the output video is right. Also, outputting avi works, too.
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