December 2017 - ffmpeg-user - lists.ffmpeg.org

loop over a sequence of images again and again
by Michael Koch 05 Dec '17

05 Dec '17

Let's assume I have a sequence of 100 images. Is it possible to let ffmpeg loop over this input sequence again and again? I mean the input should be 0, 1, 2, ... , 99, 0, 1, 2, ... , 99, 0, 1, 2 and so on. Is this possible? Thanks, Michael

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config
by 高建琛 05 Dec '17

05 Dec '17

I have install libx264,and I am sure the libx264 is good .But the running result show that error::libx264 not found.The version of my libx264 is x264-snapshot-20160511-2245.

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DTS Output
by Richard G. Anter III 05 Dec '17

05 Dec '17

Hi all, I searched and searched, but could not seem to find an answer to this, so please excuse my lack of knowledge on the subject, but I have a Synology NAS, I just installed ffmpeg, and now my MKV files with DTS encoded audio can be played directly from DS Video on my Apple TV 4. My question is: am I hearing DTS audio? Is ffmpeg transcoding from DTS to AC3? Or is it just passing the DTS to my receiver to decode? Best regards, Richard

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FFMPEG resizing
by Олег Румянцев 05 Dec '17

05 Dec '17

Hello! I have a problem, when converting the image: background becomes green, but not transparent. command: ffmpeg -i "background.png" -vf "scale=192x192,format=rgba,boxblur=9,eq=saturation=1.9" -qscale:v 2 -vframes 1 background_resized.png I found out that this is due to saturation parameter. File as an attachment. Tell me please, how I can resolve this problem, to get transparent background? Thanks.

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I can't get the ffmpeg to work with sound at all.
by Peadar Ó'Colmáin 05 Dec '17

05 Dec '17

I can't seem to make any headway with ffmpeg and sound. I've been at it for quite some time now and I have downloaded half the internet looking for a working example. I am using a downloaded program falled 'fister' which is probably quite well known. I have put code into it so that it will read the file, then compress and decompress the sound and play it. I should be getting my own voice back but I get nothing. Here is the code. I can send the whole fister project if anyone could like to have a look at it. Again, thanks in advance for any help received. Peadar void CPipe::ReadSoundDataFromFile(CBuffer* buffer) { char ErrLine[501]; int j,k,ret, got_output, len2, cnt; uint8_t * out[] = { audio_buf }; if(m_pFile) { if(!m_pFile->Read(buffer)) { OnEndOfPlayingFile(); delete m_pFile; } } ChineseFrameBuff = (uint8_t *)buffer->ptr.c; av_init_packet(&ChinesePacket); ChinesePacket.data = NULL; ChinesePacket.size = 0; ret = avcodec_encode_audio2(ChineseCodecCtx, &ChinesePacket, ChineseFrame, &got_output); if (ret < 0) { sprintf(ErrLine, "Error encoding audio frame"); AfxMessageBox(ErrLine); exit(1); } if (got_output) { int got_frame=0; // avcodec_get_frame_defaults(Mp3Frame); // doesn't seem to do aything int len = avcodec_decode_audio4(Mp3CodecContext, Mp3Frame, &got_frame, &ChinesePacket); if (len < 0 || got_frame == 0) { sprintf(ErrLine, "Error while decoding"); AfxMessageBox(ErrLine); exit(1); } if(m_pSwrCtx == NULL) { m_pSwrCtx = swr_alloc_set_opts(NULL , AV_CH_LAYOUT_STEREO , AV_SAMPLE_FMT_S16 , Mp3CodecContext->sample_rate , av_get_default_channel_layout(Mp3Frame->channels) , (AVSampleFormat)Mp3Frame->format , Mp3Frame->sample_rate , 0 , NULL ); swr_init(m_pSwrCtx); } len2 = swr_convert(m_pSwrCtx , out , AVCODEC_MAX_AUDIO_FRAME_SIZE * 4 , (const uint8_t **)Mp3Frame->extended_data , Mp3Frame->nb_samples ); // make sure the buffer is cleared out. for(int count=0; count<2000; count++) { buffer->ptr.c[count] = '*'; } strcpy(buffer->ptr.c, (char *)audio_buf); } } --- This email has been checked for viruses by AVG. http://www.avg.com

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Convert Single Image
by Damien Gallagher 04 Dec '17

04 Dec '17

Hi I am trying to convert a single jpg image to a video I am creating a list of training videos and I want to an intro video based on images I create used Graphics2D in java When I run the following command - it runs fine ffmpeg.exe -y -v error -i intro.jpg -r 1/5 intro_1.mp4 The file will play on my pc but it wont play in youtube or on my android phone Are there any restrictions on the image type / size or the generated video? Thank you Damien

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Unable to make FFMPEG to work with Icecast2 Server
by Edgar H 04 Dec '17

04 Dec '17

Thanks a lot for the help guys! The problem is now solved and it's working perfectly. Funny enough I was using a FFMPEG build from 2 days ago! Maybe it was erroneously compiled?

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unable to play recorded HEVC/H.265 video, possible bug in ffmpeg muxer or demuxer?
by Anton Sviridenko 04 Dec '17

04 Dec '17

As no one has answered my post in libav-user list http://ffmpeg.org/pipermail/libav-user/2017-November/010762.html trying to get some help here. Short description: There is an IP camera from Dahua that can stream video encoded by HEVC. I am able to view RTSP live stream using ffplay, but when I record this video I am unable to playback it, $ ffmpeg -i rtsp://admin:admin@192.168.86.113:554/cam/realmonitor?channel=1\&subtype=1 -c copy -vbsf hevc_mp4toannexb ~/temp/testhevc.mkv ffplay and all other ffmpeg-based players print same errors: hevc: No start code is found. hevc: Error splitting the input into NAL units. All important info (ffmpeg version and output, sample video) is available if you follow link above

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ffmpeg and VC++
by Peadar Ó'Colmáin 04 Dec '17

04 Dec '17

Hello all, Could anybody suggest a worked example in any kind of C that shows how to read the sound from a microphone and compress it in any format with ffmpeg Please ? I am working in Visual C++. I got it to compress and decompress video using Direct Show under Windows and I can pass the video through a holpunched UDP socket and show it on another computer ok. I am blue in the face trying to get this technology to work with sound and am coming to the conclusion that I am wasting my time. I have downloaded AACEncode and got that code to work perfectly but it is deprecated and will not process sound from a mike or file while listening for sound in another thread. I have downloaded a lot of other examples but none of them is any help. Xaudio2 is moretrouble than anything else. It won't run on any computer that I have. It has msvcrt.dll issues which seem unresolvable. I have downloaded Fabrice Ballard code and can't really get it to do anything. I can read a compacted file (like an mp3 music file), pass it through a socket and decompress and play that on another computer ok. I have downloaded "fister" which is up-to-date. I can send its sound through the holepunch uncompressed and it's fine but there's a delay cos there's no compression. The sound in fister has defied all attempts to compress it. other than AACEncode (obsolete) I have never found any code that can record from a micrphone and compress it in any form. Any suggestions will be gratefully received and if anything works I'll definitely post the results here and they'll be vital to anyone else who's stuck with the same problem. Thanks in advance Peadar, Ireland, Monday, 4 Dec 2017 --- This email has been checked for viruses by AVG. http://www.avg.com

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Unable to make FFMPEG to work with Icecast2 Server
by Edgar H 04 Dec '17

04 Dec '17

Sorry for that, didn't understand it at first... The command I'm exeucting is the following one... C:\Users\myuser\myproject>java -jar streamer/strea mer.jar 6 53122 | ffmpeg/bin/ffmpeg -f s16le -ar 48000 -ac 2 -i - -f ogg icecast ://hackme:hackme@localhost:8000/streaming.ogg And the output... ffmpeg version N-50911-g9efcfbe Copyright (c) 2000-2013 the FFmpeg developers built on Mar 13 2013 21:26:48 with gcc 4.7.2 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libg sm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libo pencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li bschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-lib twolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enabl e-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 52. 19.100 / 52. 19.100 libavcodec 55. 0.100 / 55. 0.100 libavformat 55. 0.100 / 55. 0.100 libavdevice 54. 4.100 / 54. 4.100 libavfilter 3. 45.103 / 3. 45.103 libswscale 2. 2.100 / 2. 2.100 libswresample 0. 17.102 / 0. 17.102 libpostproc 52. 2.100 / 52. 2.100 [s16le @ 0227e640] max_analyze_duration 5000000 reached at 5013333 microseconds [s16le @ 0227e640] Estimating duration from bitrate, this may be inaccurate Guessed Channel Layout for Input Stream #0.0 : stereo Input #0, s16le, from 'pipe:': Duration: N/A, bitrate: 1536 kb/s Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s [NULL @ 021f20c0] Unable to find a suitable output format for '/bin/ffmpeg' /bin/ffmpeg: Invalid argument

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