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  • What is the best way to merge (concat) mp4 files in android ?

    26 mars 2017, par Glimpse

    I am build an camera app which will allow users to pause & resume recording of an video. Currently pause & resume is possible using MediaRecorder but only for SDK >= 24.

    For version SDK < 24 I am using mediaRecorder.stop() & mediaRecorder.start(). Now I must merge those separate mp4 files into one.

    This is the current approach using FFMPEG (but with no luck):

    private void mergeVideos() {

    if (filePaths.size() == 1) {
        cropVideoToSquare();
        return;
    }

    List cmdList = new ArrayList<>();

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < filePaths.size(); i++) {
        cmdList.add("-i");
        cmdList.add(filePaths.get(i));

        sb.append("[").append(i).append(":0] [").append(i).append(":1]");
    }
    sb.append(" concat=n=").append(filePaths.size()).append(":v=1:a=1 [v] [a]");
    cmdList.add("-filter_complex");
    cmdList.add("\'" + sb.toString() + "\'");
    cmdList.add("-map");
    cmdList.add("\'[v]\'");
    cmdList.add("-map");
    cmdList.add("\'[a]\'");
    cmdList.add("-preset");
    cmdList.add("ultrafast");
    final String mergedVideoLocation = CameraHelper.generateVideoNameWithPath();
    cmdList.add(mergedVideoLocation);

    sb = new StringBuilder();
    for (String str : cmdList) {
        sb.append(str).append(" ");
    }

    String[] cmd = cmdList.toArray(new String[cmdList.size()]);

    try {
        ffmpeg = FFmpeg.getInstance(this);
        ffmpeg.execute(cmd, new MergingHandler() {
            @Override
            public void onSuccess(String message) {
                Log.d("mergeVideos", "onSuccess");
                currentFilePath = mergedVideoLocation;
                cropVideoToSquare();
            }

            @Override
            public void onFailure(String message) {
                Log.d("mergeVideos", "onFailure: " + message);
                pDialog.dismiss();
            }

            @Override
            public void onStart() {
                Log.d("mergeVideos", "onStart");
                pDialog.show();
            }
        });

    } catch (FFmpegCommandAlreadyRunningException e) {
        e.printStackTrace();
    }

}

    The exception that I am getting:

    ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.8 (GCC) configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --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/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags= libavutil 55. 17.103 / 55. 17.103 libavcodec 57. 24.102 / 57. 24.102 libavformat 57. 25.100 / 57. 25.100 libavdevice 57. 0.101 / 57. 0.101 libavfilter 6. 31.100 / 6. 31.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Pictures/CameraFeatures/VID_20170326_100318.mp4': Metadata: major_brand : 3gp4 minor_version : 0 compatible_brands: isom3gp4 creation_time : 2017-03-26 08:03:24 Duration: 00:00:04.82, start: 0.000000, bitrate: N/A Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 7764 kb/s, 30.02 fps, 30 tbr, 90k tbn, 300 tbc (default) Metadata: rotate : 90 creation_time : 2017-03-26 08:03:24 handler_name : VideoHandle Side data: displaymatrix: rotation of -90.00 degrees Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 127 kb/s (default) Metadata: creation_time : 2017-03-26 08:03:24 handler_name : SoundHandle /storage/emulated/0/Pictures/CameraFeatures/VID_20170326_100328.mp4: No such file or directory

    Can someone point out what am I doing wrong?

  • ffmpeg dont change time duration

    26 mars 2017, par combo_ci

    I tried to convert a UDP stream (that genrated from DVB signal) to HLS m3u8 file with this code:

    ffmpeg -i udp://239.1.2.1:60001 -acodec aac -strict -2 -vcodec libx264 -hls_wrap 100 -f hls /var/www/html/ts/1.m3u8

    and output m3u8 file is :

    #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:3
#EXT-X-MEDIA-SEQUENCE:66
#EXTINF:0.960000,
21.ts
#EXTINF:2.080000,
22.ts
#EXTINF:2.400000,
23.ts
#EXTINF:1.760000,
24.ts
#EXTINF:2.080000,
20.ts

    I tried to change the target duration to 10 in this file with the option -segment_time 10 but the target duration doesn't change in m3u8 file, can anybody help me with this problem?

  • ffmpeg : How can a MOV with transparent background be created ?

    25 mars 2017, par Mat

    I'm trying - with no success at all - to convert the green pixels of a background into transparent ones and output the result as clip with ffmpeg. N.b. I do not want to lay the clip over anything; I'm not having a problem with that. What I want is a clip with transparent background for the OpenShot video editor (the chromakey filter of which doesn't work satisfyingly).

    What I have tried (amongst 1 zillion other things over the last 15 hrs.) was 

    ffmpeg.exe -i in.mov -vf chromakey=0x008001:0.115:0.0 -c:v qtrle out.mov

    but the pixels simply would not be transparent. Seemingly, nothing happens. I reckon the filter is ok, because it works fine in a complex chain (overlaying a background image).

    The output of ffprompt -show_stream -show_format of out.mov is as follows:

    [STREAM]
index=0
codec_name=qtrle
codec_long_name=QuickTime Animation (RLE) video
profile=unknown
codec_type=video
codec_time_base=1/30
codec_tag_string=rle
codec_tag=0x20656c72
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=bgra
level=-99
color_range=N/A
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=unspecified
field_order=progressive
timecode=N/A
refs=1
id=N/A
r_frame_rate=30/1
avg_frame_rate=30/1
time_base=1/15360
start_pts=0
start_time=0.000000
duration_ts=54789
duration=3.566992
bit_rate=822383192
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=107
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
TAG:encoder=Lavc57.64.101 qtrle
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/44100
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=926
start_time=0.020998
duration_ts=157481
duration=3.570998
bit_rate=132103
max_bit_rate=132103
bits_per_raw_sample=N/A
nb_frames=153
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
[/STREAM]
[FORMAT]
filename=out.mov
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=3.567000
size=366708874
bit_rate=822447712
probe_score=100
TAG:major_brand=qt
TAG:minor_version=512
TAG:compatible_brands=qt
TAG:encoder=Lavf57.56.101
[/FORMAT]

    I have a "sample" clip which shows the behaviour I want, with the following stream and information:

    [STREAM]
index=0
codec_name=qtrle
codec_long_name=QuickTime Animation (RLE) video
profile=unknown
codec_type=video
codec_time_base=1/24
codec_tag_string=rle
codec_tag=0x20656c72
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=0:1
display_aspect_ratio=0:1
pix_fmt=bgra
level=-99
color_range=N/A
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=unspecified
field_order=progressive
timecode=N/A
refs=1
id=N/A
r_frame_rate=24/1
avg_frame_rate=24/1
time_base=1/12288
start_pts=0
start_time=0.000000
duration_ts=74760
duration=6.083984
bit_rate=49226848
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=146
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
TAG:encoder=Lavc57.24.102 qtrle
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/48000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=293856
duration=6.122000
bit_rate=53537
max_bit_rate=128000
bits_per_raw_sample=N/A
nb_frames=288
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
[/STREAM]
[FORMAT]
filename=templateOK.mov
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=6.144000
size=37478506
bit_rate=48800138
probe_score=100
TAG:major_brand=qt
TAG:minor_version=512
TAG:compatible_brands=qt
TAG:encoder=Lavf57.25.100
[/FORMAT]

    and I simply am not able to spot the relevant difference.

    The input, output and the working template can be found here.

    (The security issue you might see when clicking the link comes from the server certificate being self-signed. You can accept a temporal exception. Btw: The ridiculous file size of the output file will be the next nut to crack. Probably something about compression.)

  • Embedding many small movies in page (gif vs mp4 vs webm vs ?)

    25 mars 2017, par genekogan

    I am making a webpage which will contain around 20-25 small-resolution (~56x56) and short-length (~3 sec) movies which will be set to autoplay and loop, so they will be looping on the page at all times. They are mostly dispersed throughout the page, so cannot easily be merged into bigger movies.

    I'm trying to decide on the right format to use, balancing filesize, quality, and processor overhead.

    mp4 seems the best option in terms of quality and filesize, however embedding many small mp4s on the page felt to me slow and made my computer get hot. Despite the fact that if they were one mp4, it would be only around 300x240 -- it seems there is a lot of CPU overhead if they are divided.

    gif is lower quality and bigger filesize, but the CPU performance felt smoother. I can't prove it though because I didn't measure it -- are gif's known to be better performance than mp4?

    I have not tried other formats (webm, avi, ogg, etc) but I am unsure of how supported all of these formats are by most browsers and I want the webpage to be viewable from multiple browsers/countries.

    How can I determine the best format to use for these videos? Is there a tool which can measure the CPU performance of my webpage so I can quantify the performance issues?

  • Solved : ffmpeg : How can a MOV with transparent background be created ?

    25 mars 2017, par Mat

    (Remark: the error sat, as usual, between back-rest and keyboard. Thanks, Mulvya!)

    Hi, specialists!

    I'm trying - with no success at all - to convert the green pixels of a background into transparent ones and output the result as clip with ffmpeg. N.b. I do not want to lay the clip over anything; I'm not having a problem with that. What I want is a clip with transparent background for the OpenShot video editor (the chromakey filter of which doesn't work satisfyingly).

    What I have tried (amongst a felt 1 zillion other things over the last 15 hrs.) was 

    ffmpeg.exe -i in.mov -vf chromakey=0x008001:0.115:0.0 -c:v qtrle out.mov

    but the pixels simply would not be transparent. Seemingly, nothing happens. I reckon the filter is ok, because it works fine in a complex chain (overlaying a background image).

    The output of ffprompt -show_stream -show_format of out.mov is as follows:

    [STREAM]
index=0
codec_name=qtrle
codec_long_name=QuickTime Animation (RLE) video
profile=unknown
codec_type=video
codec_time_base=1/30
codec_tag_string=rle
codec_tag=0x20656c72
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=bgra
level=-99
color_range=N/A
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=unspecified
field_order=progressive
timecode=N/A
refs=1
id=N/A
r_frame_rate=30/1
avg_frame_rate=30/1
time_base=1/15360
start_pts=0
start_time=0.000000
duration_ts=54789
duration=3.566992
bit_rate=822383192
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=107
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
TAG:encoder=Lavc57.64.101 qtrle
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/44100
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=926
start_time=0.020998
duration_ts=157481
duration=3.570998
bit_rate=132103
max_bit_rate=132103
bits_per_raw_sample=N/A
nb_frames=153
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
[/STREAM]
[FORMAT]
filename=out.mov
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=3.567000
size=366708874
bit_rate=822447712
probe_score=100
TAG:major_brand=qt
TAG:minor_version=512
TAG:compatible_brands=qt
TAG:encoder=Lavf57.56.101
[/FORMAT]

    I have a "sample" clip which shows the behaviour I want, with the following stream and information:

    [STREAM]
index=0
codec_name=qtrle
codec_long_name=QuickTime Animation (RLE) video
profile=unknown
codec_type=video
codec_time_base=1/24
codec_tag_string=rle
codec_tag=0x20656c72
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=0
sample_aspect_ratio=0:1
display_aspect_ratio=0:1
pix_fmt=bgra
level=-99
color_range=N/A
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=unspecified
field_order=progressive
timecode=N/A
refs=1
id=N/A
r_frame_rate=24/1
avg_frame_rate=24/1
time_base=1/12288
start_pts=0
start_time=0.000000
duration_ts=74760
duration=6.083984
bit_rate=49226848
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=146
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
TAG:encoder=Lavc57.24.102 qtrle
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/48000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=293856
duration=6.122000
bit_rate=53537
max_bit_rate=128000
bits_per_raw_sample=N/A
nb_frames=288
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:language=eng
TAG:handler_name=DataHandler
[/STREAM]
[FORMAT]
filename=templateOK.mov
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=6.144000
size=37478506
bit_rate=48800138
probe_score=100
TAG:major_brand=qt
TAG:minor_version=512
TAG:compatible_brands=qt
TAG:encoder=Lavf57.25.100
[/FORMAT]

    and I simply am not able to spot the relevant difference.

    Any suggestions would be highly appreciated!

    Cheers,

    Mat

    The input, output and the working template can be found here.

    (The security issue you might see when clicking the link comes from the server certificate being self-signed. You can accept a temporal exception. Btw: The ridiculous file size of the output file will be the next nut to crack. Probably s.t. about compression.)

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