Fix a bug discovered by the synthetic video.

src/tscut/cutting.py

@@ -153,6 +153,8 @@ def cut_recording(media: PreparedMedia, options: ProcessingOptions,
         except InvalidMediaError:
             raise InvalidMediaError("Impossible to retrieve timestamp of final i-frame.")
 
+        assert head_iframe_ts <= tail_iframe_ts
+
         checks.append(pos+head_iframe_ts-ts1)
 
         subparts = []
@@ -199,61 +201,63 @@ def cut_recording(media: PreparedMedia, options: ProcessingOptions,
             if h264_head_ts is not None:
                 h264_ts.append(h264_head_ts)
 
-        # Creating MKV file that corresponds to current part between I-frames
-        # Internal video with all streams (video, audio and subtitles)
-        internal_mkv_name = f'part-{partnum:d}-internal.mkv'
-        # Internal video stream as a raw H264 stream
-        internal_h264_name = f'part-{partnum:d}-internal.h264'
-        # Internal video timestamps
-        internal_h264_ts_name = f'part-{partnum:d}-internal-ts.txt'
-        # Internal video with only audio and subtitles streams
-        internal_novideo_mkv_name = f'part-{partnum:d}-internal-novideo.mkv'
+        if head_iframe_ts < tail_iframe_ts:
 
-        try:
-            internal_mkv = open(internal_mkv_name, 'wb+')
-        except OSError as e:
-            raise TemporaryFileError(f"Impossible to create file: {internal_mkv_name}") from e
+            # Creating MKV file that corresponds to current part between I-frames
+            # Internal video with all streams (video, audio and subtitles)
+            internal_mkv_name = f'part-{partnum:d}-internal.mkv'
+            # Internal video stream as a raw H264 stream
+            internal_h264_name = f'part-{partnum:d}-internal.h264'
+            # Internal video timestamps
+            internal_h264_ts_name = f'part-{partnum:d}-internal-ts.txt'
+            # Internal video with only audio and subtitles streams
+            internal_novideo_mkv_name = f'part-{partnum:d}-internal-novideo.mkv'
 
-        try:
-            internal_novideo_mkv = open(internal_novideo_mkv_name, 'wb+')
-        except OSError as e:
-            raise TemporaryFileError(f"Impossible to create file: \
-                {internal_novideo_mkv_name}") from e
+            try:
+                internal_mkv = open(internal_mkv_name, 'wb+')
+            except OSError as e:
+                raise TemporaryFileError(f"Impossible to create file: {internal_mkv_name}") from e
 
-        try:
-            internal_h264 = open(internal_h264_name, 'wb+')
-        except OSError as e:
-            raise TemporaryFileError(f"Impossible to create file: {internal_h264_name}") from e
+            try:
+                internal_novideo_mkv = open(internal_novideo_mkv_name, 'wb+')
+            except OSError as e:
+                raise TemporaryFileError(f"Impossible to create file: \
+                    {internal_novideo_mkv_name}") from e
 
-        try:
-            internal_h264_ts = open(internal_h264_ts_name, 'w+', encoding='utf8')
-        except OSError as e:
-            raise TemporaryFileError(f"Impossible to create file: {internal_h264_ts_name}") from e
+            try:
+                internal_h264 = open(internal_h264_name, 'wb+')
+            except OSError as e:
+                raise TemporaryFileError(f"Impossible to create file: {internal_h264_name}") from e
 
-        # logger.info('Merge header, middle and trailer subpart into: %s' % internal_mkv_name)
-        # Extract internal part of MKV
-        extract_mkv_part(mkvmerge_path=options.tools_paths['mkvmerge'], input_file=media.movie,
-                         output_file=internal_mkv, begin=head_iframe_ts, end=tail_iframe_ts)
+            try:
+                internal_h264_ts = open(internal_h264_ts_name, 'w+', encoding='utf8')
+            except OSError as e:
+                raise TemporaryFileError(f"Impossible to create file: {internal_h264_ts_name}") from e
 
-        # Extract video stream of internal part as a raw H264 and its timestamps.
-        logger.info('Extract video track as raw H264 file.')
-        extract_track_from_mkv(mkvextract_path=options.tools_paths['mkvextract'],
-                               input_file=internal_mkv, index=0, output_file=internal_h264,
-                               timestamps=internal_h264_ts)
+            # logger.info('Merge header, middle and trailer subpart into: %s' % internal_mkv_name)
+            # Extract internal part of MKV
+            extract_mkv_part(mkvmerge_path=options.tools_paths['mkvmerge'], input_file=media.movie,
+                            output_file=internal_mkv, begin=head_iframe_ts, end=tail_iframe_ts)
 
-        # Remove video track from internal part of MKV
-        logger.info('Remove video track from %s', internal_mkv_name)
-        remove_video_tracks_from_mkv(mkvmerge_path=options.tools_paths['mkvmerge'],
-                                     input_file=internal_mkv, output_file=internal_novideo_mkv)
+            # Extract video stream of internal part as a raw H264 and its timestamps.
+            logger.info('Extract video track as raw H264 file.')
+            extract_track_from_mkv(mkvextract_path=options.tools_paths['mkvextract'],
+                                input_file=internal_mkv, index=0, output_file=internal_h264,
+                                timestamps=internal_h264_ts)
 
-        temporaries.add(internal_mkv)
-        temporaries.add(internal_h264)
-        temporaries.add(internal_h264_ts)
-        temporaries.add(internal_novideo_mkv)
+            # Remove video track from internal part of MKV
+            logger.info('Remove video track from %s', internal_mkv_name)
+            remove_video_tracks_from_mkv(mkvmerge_path=options.tools_paths['mkvmerge'],
+                                        input_file=internal_mkv, output_file=internal_novideo_mkv)
 
-        h264parts.append(internal_h264)
-        h264_ts.append(internal_h264_ts)
-        subparts.append(internal_novideo_mkv)
+            temporaries.add(internal_mkv)
+            temporaries.add(internal_h264)
+            temporaries.add(internal_h264_ts)
+            temporaries.add(internal_novideo_mkv)
+
+            h264parts.append(internal_h264)
+            h264_ts.append(internal_h264_ts)
+            subparts.append(internal_novideo_mkv)
 
         if (not options.coarse) and (nb_tail_frames > options.threshold):
             # We extract all frames between the I-frame (including it) upto the end.

src/tscut/tools/ffmpeg.py

@@ -241,7 +241,7 @@ def extract_all_streams(ffmpeg_path:str, ffprobe_path:str, input_file:IO[bytes],
                 video_codec_params.extend([f'-c:v:{video_id:d}', codec, f'-level:v:{video_id:d}',
                                            level, '-pix_fmt', pixel_format])
                 video_codec_params.extend(interlaced_options)
-                video_codec_params.extend([f'-colorspace:v:{video_id}', color_space,
+                video_codec_params.extend([f'-colorspace:v:{video_id:d}', color_space,
                                          f'-color_primaries:v:{video_id:d}', color_primaries,
                                          f'-color_trc:v:{video_id:d}', color_transfer,
                                          f'-color_range:v:{video_id:d}', color_range])