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Sur d’autres sites (4032)
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Using FFMPEG Android Library to convert PCM to m4a [duplicate]
11 avril 2016, par CvongrimThis question already has an answer here :
-
ffmpeg Too many bits per frame requested
2 answers
I am using https://github.com/WritingMinds/ffmpeg-android-java.
I have a PCM file that I created using AudioRecord.
I am now trying to convert the PCM file to an m4a file.
Running the following command converts it but it speeds up the audio making the voices on the recording sound like the chipmunks.
Finished command : ffmpeg -f s16be -i /storage/emulated/0/GMT/recordTestNew.pcm -strict -2 -y -c:a aac -b:a 176k /storage/emulated/0/GMT/recordTestFFMPEG.m4a
Which gives
SUCCESS with output : WARNING: linker: /data/user/0/com.globalmedicaltranscriptionapp/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
[s16be @ 0xf72ba000] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, s16be, from '/storage/emulated/0/GMT/recordTestNew.pcm':
Duration: 00:00:02.70, bitrate: 705 kb/s
Stream #0:0: Audio: pcm_s16be, 44100 Hz, 1 channels, s16, 705 kb/s
Output #0, ipod, to '/storage/emulated/0/GMT/recordTestFFMPEG.m4a':
Metadata:
encoder : Lavf56.4.101
Stream #0:0: Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s
Metadata:
encoder : Lavc56.1.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16be (native) -> aac (native))
Press [q] to stop, [?] for help
size= 30kB time=00:00:01.90 bitrate= 130.0kbits/s
size= 44kB time=00:00:02.71 bitrate= 131.8kbits/s
video:0kB audio:43kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.801121%The audio clip should actually be about 11 seconds long. The frequency should be 11025, The encoding is using Android’s AudioFormat.ENCODING_PCM_16BIT, the channels are using AndioFormat.CHANNEL_IN_DEFAULT.
This is my first time working with audio so it’s been a struggle. The reason why I am using AudioRecord is because I need the audio files to be in a form that allows me to split them and potentially add new audio clips in the middle.
It seems like an issue due to the frequency not being passed to the output. I tried updating the above command to
Finished command : ffmpeg -f s16be -ar 11025 -i /storage/emulated/0/GMT/recordTestNew.pcm -strict -2 -y -c:a aac /storage/emulated/0/GMT/recordTestFFMPEG.m4a
Which gives
FAILED with output : WARNING: linker: /data/user/0/com.globalmedicaltranscriptionapp/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
[s16be @ 0xf707a000] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, s16be, from '/storage/emulated/0/GMT/recordTestNew.pcm':
Duration: 00:00:10.81, bitrate: 176 kb/s
Stream #0:0: Audio: pcm_s16be, 11025 Hz, 1 channels, s16, 176 kb/s
[aac @ 0xf7043c00] Too many bits per frame requested
Output #0, ipod, to '/storage/emulated/0/GMT/recordTestFFMPEG.m4a':
Stream #0:0: Audio: aac, 0 channels, 128 kb/s
Metadata:
encoder : Lavc56.1.100 aac
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16be (native) -> aac (native))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height04-11 14:22:23.029 11026-11026/com.globalmedicaltranscriptionapp D/AudioPlayer : Finished command : ffmpeg -f s16be -ar 11025 -i /storage/emulated/0/GMT/recordTestNew.pcm -strict -2 -y -c:a aac /storage/emulated/0/GMT/recordTestFFMPEG.m4a
Doing that makes the input seem to have the correct duration and bit rate but then I get the following error.
Stream #0:0 -> #0:0 (pcm_s16be (native) -> aac (native))
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or heightI have tried a million other configurations but still can’t get it to work.
What am I doing wrong ?
-
ffmpeg Too many bits per frame requested
-
Merging two audio files in Android using FFMPEG
3 août 2016, par JeremyI’m working on an application that takes two audio files, and merges them into the respected channels. The way they are being equalized are not as good as I had hoped, So I want to adjust the volume of each file during the mixing phase. I’ve seen a couple of examples online, like this, this, and
[this][3].. but none of them are working for me. Can someone direct me in the right direction with this ? Much appreciation !I am using this library to execute : https://github.com/WritingMinds/ffmpeg-android-java
Here is my code (EDIT)
String files = "-i " + mVoiceFile.getAbsolutePath() + " -i " + mBeatFile.getAbsolutePath();
String filter = "-filter_complex [0:a]volume=0.99[a1];[1:a]volume=0.3[a2][a1][a2]amerge=inputs=2,volume=1.3,pan=stereo|c0code>enter code here
and here are my errors from running.
04-06 12:17:34.079 30975-30975/me.rapchat.rapchat E/Studio Process: WARNING: linker: /data/user/0/me.rapchat.rapchat/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
04-06 12:17:34.306 30975-30975/me.rapchat.rapchat E/Studio Process: ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
04-06 12:17:34.306 30975-30975/me.rapchat.rapchat E/Studio Process: built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
04-06 12:17:34.306 30975-30975/me.rapchat.rapchat E/Studio Process: configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
04-06 12:17:34.307 30975-30975/me.rapchat.rapchat E/Studio Process: libavutil 54. 7.100 / 54. 7.100
04-06 12:17:34.307 30975-30975/me.rapchat.rapchat E/Studio Process: libavcodec 56. 1.100 / 56. 1.100
04-06 12:17:34.307 30975-30975/me.rapchat.rapchat E/Studio Process: libavformat 56. 4.101 / 56. 4.101
04-06 12:17:34.307 30975-30975/me.rapchat.rapchat E/Studio Process: libavdevice 56. 0.100 / 56. 0.100
04-06 12:17:34.308 30975-30975/me.rapchat.rapchat E/Studio Process: libavfilter 5. 1.100 / 5. 1.100
04-06 12:17:34.308 30975-30975/me.rapchat.rapchat E/Studio Process: libswscale 3. 0.100 / 3. 0.100
04-06 12:17:34.308 30975-30975/me.rapchat.rapchat E/Studio Process: libswresample 1. 1.100 / 1. 1.100
04-06 12:17:34.308 30975-30975/me.rapchat.rapchat E/Studio Process: libpostproc 53. 0.100 / 53. 0.100
04-06 12:17:34.372 30975-30975/me.rapchat.rapchat E/Studio Process: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/recording.m4a':
04-06 12:17:34.373 30975-30975/me.rapchat.rapchat E/Studio Process: Metadata:
04-06 12:17:34.373 30975-30975/me.rapchat.rapchat E/Studio Process: major_brand : mp42
04-06 12:17:34.373 30975-30975/me.rapchat.rapchat E/Studio Process: minor_version : 0
04-06 12:17:34.374 30975-30975/me.rapchat.rapchat E/Studio Process: compatible_brands: isommp42
04-06 12:17:34.374 30975-30975/me.rapchat.rapchat E/Studio Process: creation_time : 2016-04-06 19:17:33
04-06 12:17:34.374 30975-30975/me.rapchat.rapchat E/Studio Process: Duration: 00:00:01.56, start: 0.000000, bitrate: 144 kb/s
04-06 12:17:34.375 30975-30975/me.rapchat.rapchat E/Studio Process: Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s (default)
04-06 12:17:34.375 30975-30975/me.rapchat.rapchat E/Studio Process: Metadata:
04-06 12:17:34.375 30975-30975/me.rapchat.rapchat E/Studio Process: creation_time : 2016-04-06 19:17:33
04-06 12:17:34.375 30975-30975/me.rapchat.rapchat E/Studio Process: handler_name : SoundHandle
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/beats/d3c37d60-ed50-4c00-b454-4e399a7858ff.m4a':
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: Metadata:
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: major_brand : mp42
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: minor_version : 0
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: compatible_brands: mp42isom
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: creation_time : 1993-11-24 14:46:42
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: encoder : Max 0.9.1
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: iTunSMPB : 00000000 00000840 000003c0 000000000035dc00 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: date : 2015
04-06 12:17:34.401 30975-30975/me.rapchat.rapchat E/Studio Process: Duration: 00:01:20.04, start: 0.047891, bitrate: 129 kb/s
04-06 12:17:34.402 30975-30975/me.rapchat.rapchat E/Studio Process: Stream #1:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
04-06 12:17:34.402 30975-30975/me.rapchat.rapchat E/Studio Process: Metadata:
04-06 12:17:34.402 30975-30975/me.rapchat.rapchat E/Studio Process: creation_time : 1993-11-24 14:46:42
04-06 12:17:34.404 30975-30975/me.rapchat.rapchat E/Studio Process: [NULL @ 0xb5e4fc00] Unable to find a suitable output format for '[a1][a2]amerge,pan=stereo|c0me.rapchat.rapchat E/Studio Process: [a1][a2]amerge,pan=stereo|c0me.rapchat.rapchat E/Studio Status Failed: WARNING: linker: /data/user/0/me.rapchat.rapchat/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
built on Oct 7 2014 15:08:46 with gcc 4.8 (GCC)
configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a-neon --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -mfpu=neon' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
libavutil 54. 7.100 / 54. 7.100
libavcodec 56. 1.100 / 56. 1.100
libavformat 56. 4.101 / 56. 4.101
libavdevice 56. 0.100 / 56. 0.100
libavfilter 5. 1.100 / 5. 1.100
libswscale 3. 0.100 / 3. 0.100
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 0.100 / 53. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/recording.m4a':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2016-04-06 19:17:33
Duration: 00:00:01.56, start: 0.000000, bitrate: 144 kb/s
Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s (default)
Metadata:
creation_time : 2016-04-06 19:17:33
handler_name : SoundHandle
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/me.rapchat.rapchat/cache/beats/d3c37d60-ed50-4c00-b454-4e399a7858ff.m4a':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
creation_time : 1993-11-24 14:46:42
encoder : Max 0.9.1
iTunSMPB : 00000000 00000840 000003c0 000000000035dc00 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
date : 2015
Duration: 00:01:20.04, start: 0.047891, bitrate: 129 kb/s
Stream #1:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 1993-11-24 14:46:42
[NULL @ 0xb5e4fc00] Unable to find a suitable output format for '[a1][a2]amerge,pan=stereo|c0code> -
H264 Encoding - Could not play video using VLC Player
31 mars 2016, par bot1131357I am have trouble encoding an H264 video correctly using FFmpeg libav. I could not play the encoded video in VLC media player, and although I could play the video on MPC-HC the time shows
00:00/00:00. Clearly I’m missing something.The Media info from MPC-HC shows this :
General
Format : AVC
Format/Info : Advanced Video Codec
File size : 110 KiB
Duration : 2s 400ms
Overall bit rate : 375 Kbps
Writing library : x264 core 148 r2665 a01e339
Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=7 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=12 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=12 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Baseline@L2.1
Format settings, CABAC : No
Format settings, ReFrames : 3 frames
Format settings, GOP : M=1, N=12
Duration : 2s 400ms
Bit rate : 2 000 Kbps
Width : 320 pixels
Height : 240 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 20.833 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.250
Stream size : 586 KiB
Writing library : x264 core 148 r2665 a01e339
Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=7 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=12 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=12 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00I noticed something odd in the above info :
The frame rate is 20.833fps, instead of the specified 10 fps. Duration of 2s 400msdid not seem right either, since the video played for more than 4s.Also,
(AVFrame* picture)->pict_typeis always set toAV_PICTURE_TYPE_NONE. I don’t think this is normal.The library that I’m using is ffmpeg-20160219-git-98a0053-win32-dev. I would really really appreciate if you could help me out of this confusion.
/*
* Video encoding example
*/
char filename[] = "test.mp4";
int main(int argc, char** argv)
{
AVCodec *codec = NULL;
AVCodecContext *codecCtx= NULL;
AVFormatContext *pFormatCtx = NULL;
AVStream * pVideoStream = NULL;
AVFrame *picture = NULL;
int i, x, y, //
ret, // Return value
got_packet_ptr; // Data encoded into packet
printf("Video encoding\n");
// Register all formats and codecs
av_register_all();
// allocate context
pFormatCtx = avformat_alloc_context();
memcpy(pFormatCtx->filename,filename,
min(strlen(filename), sizeof(pFormatCtx->filename)));
// guess format
pFormatCtx->oformat = av_guess_format("h264", NULL, NULL);
if (NULL==pFormatCtx->oformat)
{
cerr << "Could not guess output format" << endl;
return -1;
}
// Find the codec.
codec = avcodec_find_encoder(pFormatCtx->oformat->video_codec);
if (codec == NULL) {
fprintf(stderr, "Codec not found\n");
return -1;
}
// Set context
int framerate = 10;
codecCtx = avcodec_alloc_context3(codec);
avcodec_get_context_defaults3(codecCtx, codec);
codecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
codecCtx->profile = FF_PROFILE_H264_BASELINE;
// Resolution must be a multiple of two.
codecCtx->width = 320;
codecCtx->height = 240;
codecCtx->bit_rate = 2000000;
codecCtx->time_base.den = framerate;
codecCtx->time_base.num = 1;
codecCtx->gop_size = 12; // emit one intra frame every twelve frames at most
// Open the codec.
if (avcodec_open2(codecCtx, codec, NULL) < 0)
{
printf("Cannot open video codec\n");
return -1;
}
// Add stream to pFormatCtx
pVideoStream = avformat_new_stream(pFormatCtx, codec);
if (!pVideoStream)
{
printf("Cannot add new video stream\n");
return -1;
}
pVideoStream->codec = codecCtx;
pVideoStream->time_base.den = framerate;
pVideoStream->time_base.num = 1;
if (avio_open2(&pFormatCtx->pb, filename, AVIO_FLAG_WRITE, NULL, NULL) < 0)
{
printf("Cannot open file\n");
return -1;
}
// Write file header.
avformat_write_header(pFormatCtx, NULL);
// Create frame
picture= av_frame_alloc();
picture->format = codecCtx->pix_fmt;
picture->width = codecCtx->width;
picture->height = codecCtx->height;
int bufferImgSize = av_image_get_buffer_size(codecCtx->pix_fmt, codecCtx->width,
codecCtx->height,1);
av_image_alloc(picture->data, picture->linesize, codecCtx->width, codecCtx->height, codecCtx->pix_fmt, 32);
AVPacket avpkt;
/* encode 1 second of video */
for(i=0;i<50;i++)
{
/* prepare a dummy image */
/* Y */
for(y=0;yheight;y++)
{
for(x=0;xwidth;x++)
{
picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
}
}
/* Cb and Cr */
for(y=0;yheight/2;y++)
{
for(x=0;xwidth/2;x++)
{
picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
}
}
// Get timestamp
picture->pts = (float) i * (1000.0/(float)(codecCtx->time_base.den)) * 90;
// Encode frame to packet
av_init_packet(&avpkt);
got_packet_ptr = 0;
int error = avcodec_encode_video2(codecCtx, &avpkt, picture, &got_packet_ptr);
if (!error && got_packet_ptr > 0)
{
// Write packet with frame.
ret = (av_interleaved_write_frame(pFormatCtx, &avpkt) == 0);
}
av_packet_unref(&avpkt);
}
// Flush remaining encoded data
while(1)
{
av_init_packet(&avpkt);
got_packet_ptr = 0;
// Encode frame to packet.
int error = avcodec_encode_video2(codecCtx, &avpkt, NULL, &got_packet_ptr);
if (!error && got_packet_ptr > 0)
{
// Write packet with frame.
ret = (av_interleaved_write_frame(pFormatCtx, &avpkt) == 0);
}
else
{
break;
}
av_packet_unref(&avpkt);
}
av_write_trailer(pFormatCtx);
av_packet_unref(&avpkt);
av_frame_free(&picture);
avcodec_close(codecCtx);
av_free(codecCtx);
cin.get();
}
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