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How do you properly free a BitStreamFilter (bsf) without getting a double free error?
19 January 2021, by Alexis WilkeI'm trying to write a C++ class handling MP4 movies via ffmpeg.


First I created a couple of functions to use with
std::unique<>()so that way things get released even on exceptions.

However, I get a double free when I try to free the BitStreamFilter object, yet the documentation clearly says that each
av_bsf_alloc()must be paired with anav_bsf_free()call.



@param ctxa pointer into which the pointer to the newly-allocated context
will be written. It must be freed withav_bsf_free()after the
filtering is done.



Note: emphasis mine.


However, at the time I call the
avformat_close_input()I get a double free error, even if I haven't used the two contexts for anything!? I'm thinking that there may be a packet that both allocate and both try to free. But since these two contexts are not directly connected, I really don't understand how they end up freeing something twice.

Below is code which reproduce the error (at least on an amd64 platform). Once compiled, you can just execute it. Make sure to specify a filename as in:


./ffmpeg_demuxer_test mymovie.mp4


I used the following command to compile & link the code:


$ /usr/bin/c++ -std=c++17 -DDEBUG -D_DEBUG -D_GLIBCXX_ASSERTIONS -g -O0 \
 -fsanitize=address -fsanitize=enum -fsanitize=unreachable \
 -o ffmpeg_demuxer_test ffmpeg_demuxer_test.cpp \
 -lavformat -lavcodec


Notice the
-fsanitize=...options to capture errors such as a double free error.

Here is the code:


extern "C" {
#include <libavformat></libavformat>avformat.h>
#include <libavformat></libavformat>avio.h>
#include <libavcodec></libavcodec>avcodec.h>
}
#include <iostream>
#include <memory>


void ffmpeg_demuxer_avformat_context_free(AVFormatContext * context)
{
 if(context != nullptr) avformat_close_input(&context);
}

void ffmpeg_demuxer_av_bsf_free(AVBSFContext * context)
{
 if(context != nullptr) av_bsf_free(&context);
}


int main(int argc, char * argv [])
{
 if(argc != 2)
 {
 std::cout << "Usage: " << argv[0] << " movie.mp4" << std::endl;
 exit(1);
 }

 // init the AV libraries
 //
 av_register_all();
 avformat_network_init();

 // allocate the AVFormatContext
 //
 AVFormatContext * format_context(nullptr);
 int const r1(avformat_open_input(
 &format_context
 , argv[1]
 , nullptr // input format
 , nullptr)); // options
 if(r1 != 0
 || format_context == nullptr)
 {
 throw std::bad_alloc();
 }

 auto f_format_context = std::unique_ptr<
 AVFormatContext
 , decltype(&ffmpeg_demuxer_avformat_context_free)>(
 format_context
 , &ffmpeg_demuxer_avformat_context_free);


 // now allocate a stream
 //
 if(avformat_find_stream_info(f_format_context.get(), nullptr) < 0)
 {
 throw std::runtime_error("ffmpeg: Could not find stream info");
 }

 auto f_video_stream_index = av_find_best_stream(
 f_format_context.get()
 , AVMEDIA_TYPE_VIDEO
 , -1 // wanted stream (any)
 , -1 // related stream (none)
 , nullptr // AVCodec *
 , 0); // flags
 if(f_video_stream_index < 0)
 {
 throw std::runtime_error("ffmpeg: Could not find stream in input file");
 }
 if(static_cast<unsigned int="int">(f_video_stream_index) >= f_format_context->nb_streams)
 {
 throw std::range_error("ffmpeg: Stream index out of range");
 }

 auto f_stream = f_format_context->streams[f_video_stream_index];

 auto f_video_codec = f_stream->codecpar->codec_id;

 int f_bit_depth(0);
 switch(f_stream->codecpar->format)
 {
 case AV_PIX_FMT_YUV420P10LE:
 f_bit_depth = 10;
 break;

 case AV_PIX_FMT_YUV420P12LE:
 f_bit_depth = 12;
 break;

 default:
 f_bit_depth = 8;
 break;

 }

 bool f_mp4_h264 = f_video_codec == AV_CODEC_ID_H264 && (
 strcmp(f_format_context->iformat->long_name, "QuickTime / MOV") == 0
 || strcmp(f_format_context->iformat->long_name, "FLV (Flash Video)") == 0
 || strcmp(f_format_context->iformat->long_name, "Matroska / WebM") == 0
 );

 if(f_mp4_h264)
 {
 AVBitStreamFilter const * bsf_stream_filter(av_bsf_get_by_name("h264_mp4toannexb"));
 if(bsf_stream_filter == nullptr)
 {
 throw std::runtime_error("av_bsf_get_by_name(\"h264_mp4toannexb\") failed");
 }
 AVBSFContext * bsf_context(nullptr);
 int const r2(av_bsf_alloc(bsf_stream_filter, &bsf_context));
 if(r2 < 0
 || bsf_context == nullptr)
 {
 throw std::bad_alloc();
 }
 auto f_bsf_context = std::unique_ptr<
 AVBSFContext
 , decltype(&ffmpeg_demuxer_av_bsf_free)>(
 bsf_context
 , &ffmpeg_demuxer_av_bsf_free);
 f_bsf_context->par_in = f_stream->codecpar;
 if(av_bsf_init(f_bsf_context.get()) < 0)
 {
 throw std::runtime_error("av_bsf_init() failed");
 }
 }

 return 0;
}
</unsigned></memory></iostream>

So. Am I misreading the documentation or misusing one of the free/close function? I don't think that the
AVBSFContextitself gets released when I close theAVFormatContext, but I may be mistaken?

I won't put "C" as a tag since it will get removed even though this applies to C. It's not because I use C++ that I get a double free (i.e. it happens in the ffmpeg C library).


-
V2.97a.20120513 - Fixes for Android 2.3 playback, onPosition() in HTML5, Flash 9 double-play edge case. Minor new Flash 9-specific features.
14 May 2012, by Scott Schillerm script/soundmanager2-jsmin.js m script/soundmanager2-nodebug-jsmin.js m script/soundmanager2-nodebug.js m script/soundmanager2.js m src/SoundManager2.as m src/SoundManager2_AS3.as m swf/soundmanager2.swf m swf/soundmanager2_debug.swf m swf/soundmanager2_flash9.swf m (...)
-
Android-FFmpeg adding subtitle to mp4 video does not work
7 September 2022, by ebdaa appI am trying to add srt file to a mp4 video using android mobile-ffmpeg , the code works with no error but the generated video does not contain the subtitle


here is the code :


String cmd = "-i " + videoPath + " -vf subtitles=\"" + subtitlePath + ":force_style='Alignment=10,Fontsize=18'\" " + OutputVideoPath;
 FFmpeg.executeAsync(cmd, new ExecuteCallback() {
 @Override
 public void apply(final long executionId, final int returnCode) {
 if (returnCode == RETURN_CODE_SUCCESS) {
 } else {
 
 }
 }
 });


here are the logs


I/mobile-ffmpeg: ffmpeg version v4.4-dev-416
 Copyright (c) 2000-2020 the FFmpeg developers
I/mobile-ffmpeg: built with Android (6454773 based on r365631c2) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 98c855489587874b2a325e7a516b99d838599c6f) (based on LLVM 9.0.8svn)
 configuration: --cross-prefix=arm-linux-androideabi- --sysroot=/files/android-sdk/ndk/21.3.6528147/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm/neon/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=armv7-a --cpu=armv7-a --cc=armv7a-linux-androideabi24-clang --cxx=armv7a-linux-androideabi24-clang++ --extra-libs='-L/home/taner/Projects/mobile-ffmpeg/prebuilt/android-arm/neon/cpu-features/lib -lndk_compat' --target-os=android --enable-neon --enable-asm --enable-inline-asm --build-suffix=_neon --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --enable-shared --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-openssl --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-static --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libwavpack --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libaom --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-zlib --enable-mediacodec
I/mobile-ffmpeg: libavutil 56. 55.100 / 56. 55.100
 libavcodec 58. 96.100 / 58. 96.100
I/mobile-ffmpeg: libavformat 58. 48.100 / 58. 48.100
 libavdevice 58. 11.101 / 58. 11.101
 libavfilter 7. 87.100 / 7. 87.100
 libswscale 5. 8.100 / 5. 8.100
I/mobile-ffmpeg: libswresample 3. 8.100 / 3. 8.100
I/mobile-ffmpeg: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Download/7b85de4d-6af2-4eea-be9d-0d13c7f7819f/001001.mp4':
 Metadata:
 major_brand : 
I/mobile-ffmpeg: isom
 minor_version : 
I/mobile-ffmpeg: 512
 compatible_brands: 
I/mobile-ffmpeg: isomiso2mp41
I/mobile-ffmpeg: encoder : 
 Lavf58.48.100
I/mobile-ffmpeg: Duration: 
 00:00:29.60
 , start: 
I/mobile-ffmpeg: 0.000000
 , bitrate: 
 466 kb/s
I/mobile-ffmpeg: Stream #0:0
 (und)
I/mobile-ffmpeg: : Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:2 DAR 2:3], 336 kb/s
 , 
 5 fps, 
I/mobile-ffmpeg: 5 tbr, 
 10240 tbn, 
 5 tbc
I/mobile-ffmpeg: (default)
I/mobile-ffmpeg: Metadata:
 handler_name : 
 VideoHandler
I/mobile-ffmpeg: Stream #0:1
I/mobile-ffmpeg: (und)
 : Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
 (default)
I/mobile-ffmpeg: Metadata:
I/mobile-ffmpeg: handler_name : 
 SoundHandler
W/mobile-ffmpeg: Codec AVOption preset (Configuration preset) specified for output file #0 (/storage/emulated/0/Download/QuranYaser/7b85de4d-6af2-4eea-be9d-0d13c7f7819f/001001_sub.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
I/mobile-ffmpeg: Stream mapping:
I/mobile-ffmpeg: Stream #0:0 -> #0:0
I/mobile-ffmpeg: (mpeg4 (native) -> mpeg4 (native))
I/mobile-ffmpeg: Stream #0:1 -> #0:1
 (aac (native) -> aac (native))
I/mobile-ffmpeg: Press [q] to stop, [?] for help
 frame= 0 fps=0.0 q=0.0 size= 0kB time=-577014:32:22.77 bitrate= -0.0kbits/s speed=N/A 
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0xf35ee820] Shaper: FriBidi 1.0.9 (SIMPLE)
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0xf35ee820] 
W/mobile-ffmpeg: [Parsed_subtitles_0 @ 0xf35ee820] No usable fontconfig configuration file found, using fallback.
 [Parsed_subtitles_0 @ 0xf35ee820] 
I/mobile-ffmpeg: [Parsed_subtitles_0 @ 0xf35ee820] Using font provider fontconfig
 [Parsed_subtitles_0 @ 0xf35ee820] 
W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0xf35ee880] sws_param option is deprecated and ignored
I/mobile-ffmpeg: Output #0, mp4, to '/storage/emulated/0/Download/QuranYaser/7b85de4d-6af2-4eea-be9d-0d13c7f7819f/001001_sub.mp4':
I/mobile-ffmpeg: Metadata:
 major_brand : 
 isom
I/mobile-ffmpeg: minor_version : 
 512
I/mobile-ffmpeg: compatible_brands: 
I/mobile-ffmpeg: isomiso2mp41
 encoder : 
I/mobile-ffmpeg: Lavf58.48.100
 Stream #0:0
I/mobile-ffmpeg: (und)
 : Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x480 [SAR 1:2 DAR 2:3], q=2-31, 200 kb/s
 , 
I/mobile-ffmpeg: 5 fps, 
I/mobile-ffmpeg: 10240 tbn, 
 5 tbc
I/mobile-ffmpeg: (default)
 Metadata:
I/mobile-ffmpeg: handler_name : 
 VideoHandler
 encoder : 
I/mobile-ffmpeg: Lavc58.96.100 mpeg4
 Side data:
I/mobile-ffmpeg: 
 cpb: 
 bitrate max/min/avg: 0/0/200000 buffer size: 0 
 vbv_delay: N/A
I/mobile-ffmpeg: Stream #0:1
 (und)
I/mobile-ffmpeg: : Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
 (default)
 Metadata:
I/mobile-ffmpeg: handler_name : 
 SoundHandler
I/mobile-ffmpeg: encoder : 
 Lavc58.96.100 aac
I/mobile-ffmpeg: frame= 11 fps=0.0 q=2.0 size= 0kB time=00:00:03.59 bitrate= 0.1kbits/s speed=7.16x 
I/mobile-ffmpeg: frame= 30 fps= 30 q=2.0 size= 256kB time=00:00:07.47 bitrate= 280.5kbits/s speed=7.44x 
I/mobile-ffmpeg: frame= 50 fps= 33 q=2.0 size= 512kB time=00:00:11.54 bitrate= 363.5kbits/s speed=7.67x 
I/mobile-ffmpeg: frame= 71 fps= 35 q=2.0 size= 768kB time=00:00:15.71 bitrate= 400.2kbits/s speed=7.83x 
I/mobile-ffmpeg: frame= 92 fps= 37 q=2.0 size= 1024kB time=00:00:19.78 bitrate= 424.0kbits/s speed=7.88x 
I/mobile-ffmpeg: frame= 110 fps= 36 q=2.0 size= 1280kB time=00:00:23.38 bitrate= 448.5kbits/s speed=7.75x 
I/mobile-ffmpeg: frame= 128 fps= 36 q=2.0 size= 1280kB time=00:00:27.12 bitrate= 386.6kbits/s speed=7.71x 
I/mobile-ffmpeg: frame= 148 fps= 38 q=8.4 Lsize= 1697kB time=00:00:29.40 bitrate= 472.9kbits/s speed=7.56x 
 video:1225kB audio:462kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
I/mobile-ffmpeg: 0.559634%
I/mobile-ffmpeg: [aac @ 0xbe48c800] Qavg: 163.999


here is a sample of srt file I am trying to merge:


1
00:00:00,000 --> 00:00:03,326
 Text 1

2
00:00:03,326 --> 00:00:09,962
 Text 2

3
00:00:09,962 --> 00:00:16,160
 Text 3

4
00:00:16,160 --> 00:00:22,223
 Text 4


any idea why the generated video does not contain the subtitle ?


Update


Based on below comment , I changed my code to use the latest ffmpeg-kit version , here is the new code


String cmd = "-i " + videoPath + " -vf subtitles=\"" + subtitlePAth + ":force_style='Alignment=10,Fontsize=18\" " + 
 outputVideoPath;

 FFmpegKit.executeAsync(cmd, new FFmpegSessionCompleteCallback() {

 @Override
 public void apply(FFmpegSession session) {

 }
 }, new LogCallback() {

 @Override
 public void apply(com.arthenica.ffmpegkit.Log log) {


 }
 }, new StatisticsCallback() {

 @Override
 public void apply(Statistics statistics) { 

 }
 });`


and here is the updated log


ffmpeg version v4.5-dev-3393-g30322ebe3c Copyright (c) 2000-2021 the FFmpeg developers
 built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
 configuration: --cross-prefix=arm-linux-androideabi- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/storage/light/projects/ffmpeg-kit/prebuilt/android-arm-neon/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=armv7-a --cpu=armv7-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --build-suffix=_neon --ar=arm-linux-androideabi-ar --cc=armv7a-linux-androideabi24-clang --cxx=armv7a-linux-androideabi24-clang++ --ranlib=arm-linux-androideabi-ranlib --strip=arm-linux-androideabi-strip --nm=arm-linux-androideabi-nm --extra-libs='-L/storage/light/projects/ffmpeg-kit/prebuilt/android-arm-neon/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libdav1d --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-libzimg --disable-openssl --enable-zlib --enable-mediacodec
 libavutil 57. 13.100 / 57. 13.100
 libavcodec 59. 15.102 / 59. 15.102
 libavformat 59. 10.100 / 59. 10.100
 libavdevice 59. 1.100 / 59. 1.100
 libavfilter 8. 21.100 / 8. 21.100
 libswscale 6. 1.102 / 6. 1.102
 libswresample 4. 0.100 / 4. 0.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Download/7b85de4d-6af2-4eea-be9d-0d13c7f7819f/001001.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf59.10.100
 Duration: 00:00:29.60, start: 0.000000, bitrate: 467 kb/s
 Stream #0:0[0x1](und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt470bg/bt709/bt709), 640x480 [SAR 1:2 DAR 2:3], 336 kb/s, 5 fps, 5 tbr, 10240 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
 [mpeg4 @ 0xbacc1080] The "sub_text_format" option is deprecated: Deprecated, does nothing
 [aac @ 0xbacc1400] The "sub_text_format" option is deprecated: Deprecated, does nothing
 Stream mapping:
 Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
 Press [q] to stop, [?] for help
 [Parsed_subtitles_0 @ 0xf35141e0] libass API version: 0x1502000[Parsed_subtitles_0 @ 0xf35141e0] 
 [Parsed_subtitles_0 @ 0xf35141e0] libass source: commit: 0.15.2-0-gc967a5a3d9ec0d36af1148b3fdf2f307a21dd122[Parsed_subtitles_0 @ 0xf35141e0] 
 [Parsed_subtitles_0 @ 0xf35141e0] Shaper: FriBidi 1.0.11 (SIMPLE) HarfBuzz-ng 3.2.0 (COMPLEX)[Parsed_subtitles_0 @ 0xf35141e0] 
 [Parsed_subtitles_0 @ 0xf35141e0] No usable fontconfig configuration file found, using fallback.[Parsed_subtitles_0 @ 0xf35141e0] 
 [Parsed_subtitles_0 @ 0xf35141e0] Using font provider fontconfig[Parsed_subtitles_0 @ 0xf35141e0] 
 [Parsed_subtitles_0 @ 0xf35141e0] fontselect: failed to find any fallback with glyph 0x0 for font: (Arial, 400, 0)[Parsed_subtitles_0 @ 0xf35141e0] 
 Output #0, mp4, to '/storage/emulated/0/Download/7b85de4d-6af2-4eea-be9d-0d13c7f7819f/001001_sub5.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2mp41
 encoder : Lavf59.10.100
 Stream #0:0(und): Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, bt470bg/bt709/bt709, progressive), 640x480 [SAR 1:2 DAR 2:3], q=2-31, 200 kb/s, 5 fps, 10240 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc59.15.102 mpeg4
 Side data:
 cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
 Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc59.15.102 aac
 frame= 1 fps=0.0 q=5.7 size= 0kB time=00:00:01.55 bitrate= 0.2kbits/s speed= 2.4x 
 frame= 10 fps=8.7 q=2.0 size= 0kB time=00:00:03.50 bitrate= 0.1kbits/s speed=3.04x 
 frame= 20 fps= 12 q=2.0 size= 0kB time=00:00:05.36 bitrate= 0.1kbits/s speed=3.24x 
 frame= 32 fps= 15 q=2.0 size= 256kB time=00:00:07.87 bitrate= 266.5kbits/s speed=3.65x 
 frame= 45 fps= 17 q=2.0 size= 256kB time=00:00:10.49 bitrate= 199.8kbits/s speed=3.95x 
 frame= 58 fps= 18 q=2.0 size= 512kB time=00:00:12.97 bitrate= 323.2kbits/s speed=4.11x 
 frame= 69 fps= 19 q=2.0 size= 768kB time=00:00:15.23 bitrate= 413.1kbits/s speed=4.16x 
 frame= 81 fps= 19 q=2.0 size= 768kB time=00:00:17.60 bitrate= 357.5kbits/s speed=4.23x 
 frame= 92 fps= 20 q=2.0 size= 1024kB time=00:00:19.85 bitrate= 422.6kbits/s speed=4.26x 
 frame= 102 fps= 20 q=2.0 size= 1024kB time=00:00:21.89 bitrate= 383.1kbits/s speed=4.24x 
 frame= 115 fps= 20 q=2.0 size= 1280kB time=00:00:24.40 bitrate= 429.7kbits/s speed=4.31x 
 frame= 126 fps= 20 q=2.0 size= 1280kB time=00:00:26.67 bitrate= 393.0kbits/s speed=4.32x 
 frame= 139 fps= 21 q=2.0 size= 1536kB time=00:00:29.28 bitrate= 429.8kbits/s speed=4.39x 
 frame= 148 fps= 22 q=8.4 Lsize= 1701kB time=00:00:29.40 bitrate= 473.9kbits/s speed=4.34x 
 video:1225kB audio:466kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.561835%
 [aac @ 0xbacc2200] Qavg: 482.514


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